JP2009063450A - Apparatus, method, and program for evaluating stable state - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus, method and program for evaluating a stable state of a plurality of structures in a structural body constituted by stacking the plurality of structures. <P>SOLUTION: Acceleration response information showing acceleration response when a striking force is applied by an impulse hammer 16 to an evaluating object structure 50 as an evaluating object of the stable state of the plurality of structures in the structural body constituted by stacking the plurality of structures is acquired by an accelerometer 14. A PC 12 derives at least one of maximum acceleration amplitude value as the maximum value of the acceleration amplitude shown by the acquired acceleration response information and average frequency as the average value of the frequency per second of the acceleration response shown by the acceleration response information, compares at least one of the derived maximum acceleration amplitude value and the average frequency with a predetermined threshold, determines the stable state of the evaluating object structure 50 based on the comparison result, and displays the determination result with a display. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stable state evaluation apparatus, a stable state evaluation method, and a stable state evaluation program. More specifically, the present invention relates to a stable state for evaluating the stable state of each structure in a structure formed by stacking a plurality of structures. The present invention relates to an evaluation apparatus, a stable state evaluation method, and a stable state evaluation program.

  Many of the existing concrete block retaining walls are aged. In addition, many of the stone walls of the castle walls have been several hundred years old, and many have suffered from problems such as falling stones and sticking out, and many repair works have been carried out.

  Therefore, it is possible to evaluate the stability of the structure in a structure constructed by stacking structures such as concrete blocks, mortar blocks, stones, etc., such as concrete block stacking walls and castle walls. In the past, there have been the following techniques for evaluating the stable state of the structure.

  First, in patent document 1, it installed in two places near the upper end of a block-shaped structure for the purpose of providing the soundness evaluation method of the block-shaped structure which can evaluate the soundness of the foundation at the time of water increase simply. A step of obtaining behavior data of the block-like structure using a sensor, a step of illustrating a trajectory of a specific vertical component based on the behavior data, and the shape of the trajectory from the shape of the trajectory. The technology which has the process of evaluating the soundness of the foundation of this is disclosed.

  Moreover, in patent document 2, when evaluating the soundness with respect to the fall of a block-shaped structure, it is required in order to evaluate the soundness with respect to the fall of the said structure only by measuring the microtremor of a short fixed time. For the purpose of providing a device for determining the value, a line is taken on the upper end surface of the target structure in the direction in which the soundness level against the fall is to be evaluated, and the horizontal and vertical fine movements are applied to the two ends of the line. Place the sensor to measure, measure the microtremors for a short period of time, and use the measured microtremors to measure the soundness of the structure against falling, such as the R value to evaluate the soundness of the block-shaped structure An apparatus for obtaining a value to be evaluated, which includes a sensor for detecting vibration, an A / D conversion / recording unit for A / D converting and recording the detected vibration data, and a structure from the A / D converted vibration data. Thing A processing unit for evaluating the soundness for credit, technology and an output unit for outputting the soundness obtained is disclosed.

  Further, in Patent Document 3, for the purpose of providing a method for evaluating the degree of soundness of a block-like structure against falling, the horizontal direction of the waveform of the measured fine movement is measured constantly on the block-like structure. Using the component and the vertical component, the contribution ratio of the rocking vibration in the total vibration is obtained, the degree of the rocking vibration at an arbitrary position is obtained using the obtained contribution ratio of the rocking vibration, and the degree of the rocking vibration obtained. A technique for evaluating that the block-like structure is in an unstable state with respect to overturning is disclosed.

Further, Patent Document 4 aims at diagnosing the soundness of the structure by obtaining a numerical value indicating the correlation between the vibration waveform in the horizontal direction and the vertical direction with respect to the vibration waveform of a block-like structure such as a bridge pier. As a result of measuring the microtremor at the end of the structure to be diagnosed soundness, the vibration waveform of the horizontal component and the vertical component of the same time is obtained, and the correlation coefficient, etc. By obtaining a numerical value indicating the correlation, a technique is disclosed in which it is possible to know the connection state with the foundation of the structure, and thereby diagnose the soundness of the structure.
JP 2005-283361 A Japanese Patent Laid-Open No. 9-15106 JP-A-8-5522 JP-A-6-313735

  However, in the techniques disclosed in each of Patent Documents 1 to 4 above, the target structure is a single block-shaped structure such as a bridge pier, and thus a plurality of structures. There is a problem that the structure in the structure formed by stacking objects cannot be an object of evaluation.

  The present invention has been made to solve the above-described problems, and it is possible to easily and accurately evaluate the stable state of a plurality of structures in a structure formed by stacking a plurality of structures. An object is to provide a stable state evaluation device, a stable state evaluation method, and a stable state evaluation program.

  Here, the principle of the present invention will be described.

  The inventors of the present invention first make a model using the mortar block shown in FIG. 14, and the concrete blocks and stones are stacked in a highly restrained state (high stability state). An experiment (hereinafter referred to as “Experiment A”) was performed to reproduce the state of being present.

  Specifically, as shown in the figure, each mortar block is stacked in three stages in direct contact with each other, and the second mortar block from the bottom is hit with an iron ball. The vibration waveform (acceleration waveform) was measured with an accelerometer. At this time, the iron ball was swung up to an angle of 30 ° from the vertical direction and allowed to fall freely so that the striking force in each measurement was as uniform as possible. The acceleration was measured in a state where the accelerometer was brought into contact with the surface of the mortar block by an operator's hand (the state where adhesion with an adhesive was not performed).

  Under the above conditions, the acceleration waveform obtained by performing the measurement three times and the vibration frequency per second (hereinafter simply referred to as “vibration frequency”) obtained by Fourier transforming the acceleration waveform. The spectrum is shown in FIG. Here, in the same figure, the maximum value of acceleration and the value of average frequency are also shown. The average frequency is a frequency (acceleration spectrum area) that becomes a boundary when the integrated value of the acceleration spectrum indicated by the acceleration response information is equally divided into two, as shown in the rightmost graph of FIG. The frequency is divided into two equally. Also, as shown in the figure, since the acceleration converges at a frequency near 1000 Hz, the application range of the acceleration spectrum that divides the integrated value into two (acceleration spectrum that divides the area into two) is as follows. The frequency ranges from 0 Hz to 1000 Hz.

  In the spectrum of the frequency, peaks were observed at two positions of about 100 Hz and about 600 Hz, one time showing a maximum value at about 100 Hz, and the other two times showing a maximum value at about 600 Hz.

  When the frequency at which the acceleration shows the maximum value is handled as a representative value, it becomes about 100 Hz or about 600 Hz for each measurement, and the value may vary greatly. Therefore, the average frequency is defined as described above in the region where the frequency is 1000 Hz or less, and this is handled as a representative value of the frequency. The three measurement waveforms and the average frequency were in good agreement, and it was found that measurement reproducibility was high.

  Next, FIG. 16 shows the result of the same measurement performed by bonding the accelerometer to the mortar block with an adhesive. Also in this case, the three measurement waveforms and the average frequency are in good agreement, and it has been found that measurement reproducibility is high. Further, when the measurement results of FIG. 15 and FIG. 16 were compared, it was found that they were very similar.

  Next, the inventors of the present invention make a model using the mortar block shown in FIG. 17, and the concrete block and the stone protrude from the surface and the like (the stability is low). An experiment (hereinafter referred to as “Experiment B”) was performed to reproduce the state of being stacked in a low state.

  Specifically, as shown in the figure, an air sheet (bubble cushioning material: particle size 10 mm, height 4 mm) confined in air, which is commercially available as a packing material, is interposed (inserted) between the blocks. In this state, the mortar blocks were stacked in three stages, the iron ball was hit on the second mortar block from the bottom, and the vibration waveform (acceleration waveform) of the block at that time was measured with an accelerometer. At this time, the iron ball is swung up to an angle of 30 ° from the vertical direction and allowed to fall freely, so that the striking force in each measurement is as uniform as possible, and the acceleration is measured on the surface of the mortar block. The first state where the accelerometer is in contact with the hand (the state where the adhesive is not bonded) and the second state where the accelerometer is bonded to the surface of the mortar block did.

  FIG. 18 shows the acceleration waveform obtained by performing the measurement three times by applying the first state, and the spectrum of the frequency obtained by Fourier transforming the acceleration waveform. Further, FIG. 19 shows an acceleration waveform obtained by performing the measurement three times by applying the second state, and a spectrum of the frequency obtained by Fourier transforming the acceleration waveform. 18 and 19 also show the maximum acceleration value and the average frequency value.

  As a result, both FIG. 18 and FIG. 19 have high reproducibility, and both data are very similar, and it has been found that measurement reproducibility is high.

  As a result of each measurement of Experiment A and Experiment B, the measurement result shown in FIG. 15 and the measurement result shown in FIG. 16 are very similar, the measurement result shown in FIG. 18 and the measurement shown in FIG. Since the results are very similar, it has been found that the accelerometer does not necessarily have to be adhered to the block, and can be measured in a state of contact without adhesion.

Moreover, the result of Experiment A and the result of Experiment B are greatly different, and it has been found that there are the following two characteristics.
(1) Experiment A with a high degree of constraint of the block has a smaller maximum amplitude value of the acceleration waveform (hereinafter referred to as “maximum acceleration amplitude value”) than Experiment B with a low degree of restriction. (While a 3 to 4 m / ^{s 2} about In experiment A, the experiment B 4-6 m / ^{s 2} degrees.)
(2) Experiment A with a high degree of constraint of blocks has a higher average frequency than Experiment B with a low degree of restriction. (In Experiment A, it is about 400 Hz to 600 Hz, while in Experiment B, it is about 200 to 300 Hz.)
Based on the above experimental results, the inventors of the present invention next produced a test model schematically shown in FIG.

  As shown in the figure, this test model was obtained by simulating a stone wall by stacking five mortar blocks in five stages, and the bottom stage was fixed to a concrete slab with plaster. Also, block No. An air sheet was inserted under the six blocks 1 to 6 to reproduce a condition in which the degree of restraint of the stone wall was low. The purpose of this test is to confirm whether or not the stable state of these blocks with a low degree of constraint can be determined by the above-described maximum acceleration amplitude value and average frequency. The mortar block used had a width of 15 cm, a height of 12.5 cm, a depth of 30 cm, and a mass of 12.9 kg, except that the air sheet was inserted in the lower part, and the air sheet was inserted in the lower part. The thing with a height of 11.5 cm was used. Moreover, the air sheet used the commercially available packing material (what enclosed air in the sheet | seat made from vinyl) so that it might become 1 cm in height.

  In the test, the block No. except for the model boundary (bottom, top, and side). Twelve mortar blocks 1 to 12 were each struck with an impulse hammer, and the acceleration response at that time was measured. In addition, block No. in FIG. Block No. 1 of each block 1-12. The numerical value described below is the striking force (unit: N (Newton)) applied by the impulse hammer.

  Next, as schematically shown in FIG. 21, the inventors of the present invention refer to the air sheet as a plastic bag filled with sand (here, Toyoura standard sand) (hereinafter referred to as “sand bag”). ), And the same test was performed on the upper six blocks (block Nos. 13 to 18). Here, the purpose of the insertion of the sand bag is to acquire data under conditions where the degree of restraint is higher than that of the air sheet and the degree of restraint is lower than when the blocks are in contact with each other. . In addition, block No. in FIG. Block Nos. 13 to 18 of each block. The numerical value described below is also the striking force (unit: N (Newton)) applied by the impulse hammer, as in FIG.

  FIG. 22 shows a graph showing the relationship between the striking force and the maximum acceleration amplitude value obtained by the test using the above two types of test models. In the figure, an air seat is provided at the lower part of the block, and the degree of restraint is low (Block Nos. 1 to 6: ●), and there is no inclusion at the lower part of the block and the degree of restraint is high (Block No. 7-12: ▲), and a sand bag is provided at the bottom of the block, and the degree of restraint is medium (block No. 13-18: ■) is indicated by a different mark for each degree of restraint.

As shown in the figure, the block No. The maximum acceleration amplitude value of each block of 1 to 6 is 5.8 to 7.7 m / s ² , and the block No. with a high degree of restraint. The maximum acceleration amplitude values of the blocks 7 to 12 are greatly different from 0.9 to 3.8 m / s ² , and the difference between them can be clearly confirmed. Therefore, blocks with a low degree of constraint can be specified by the maximum acceleration amplitude value, and it can be determined that the stable state of these blocks is relatively poor.

  On the other hand, FIG. 23 shows a graph showing the relationship between the striking force and the average frequency obtained by the test using the two types of test models. Here, as shown in FIG. 15 as an example, the average frequency is the frequency (the area of the acceleration spectrum) that becomes a boundary when the integrated value of the acceleration spectrum indicated by the acceleration response information is equally divided into two. Is the frequency that is equally divided into two). Also, as shown in the figure, since the acceleration converges at a frequency near 1000 Hz, the application range of the acceleration spectrum that divides the integrated value into two (acceleration spectrum that divides the area into two) is as follows. The frequency ranges from 0 Hz to 1000 Hz.

  As shown in the figure, the block No. In the blocks 1 to 6, although the average frequency tends to increase as the impact force increases, such a tendency is not observed in the other blocks.

  Block No. with a low degree of constraint. The average frequency of each block of 1 to 6 is 98 to 159 Hz, and the block No. The average frequencies of the blocks 7 to 12 are greatly different at 202 to 267 Hz, and the difference between them can be clearly confirmed. Therefore, blocks with a low degree of constraint can be identified by the average frequency, and it can be determined that the stable state of these blocks is relatively poor.

On the other hand, FIG. 24 shows a graph in which the maximum acceleration amplitude value and the average vibration frequency shown in FIGS. 22 and 23 are normalized and added together and plotted on the vertical axis. Here, as the normalization, normalization is applied in which the maximum value is 1 for the maximum acceleration amplitude value and 0 is the minimum value, and the maximum value is 0 and the minimum value is 1 for the average frequency. Applying normalization. For example, when the maximum acceleration amplitude value is 8 m / s ² and the minimum value is 1 m / s ² and 5 m / s ² is normalized, (5-1) / (8-1) ≈0. 57. For example, when the maximum value of the average frequency is 300 Hz, the minimum value is 100 Hz, and 200 Hz is normalized, (300−200) / (300−100) = 0.50.

  In FIG. 24, it can be determined that the greater the value on the vertical axis (closer to 2), the lower the degree of restraint and the worse the stable state. About the block where the sandbag of the medium degree of restraint is interposed, although the tendency that the total value of the normalized maximum acceleration amplitude value and the average frequency increases as the striking force increases, in other blocks Such a tendency is not seen.

  The values on the vertical axis in the figure are 1.37 to 1.96 for blocks with a low degree of restriction, 0.85 to 1.42 for blocks with a medium degree of restriction, and 0.8 for a block with a high degree of restriction. The values are different from 21 to 0.78, and the difference between the three types of constraints can be confirmed. For this reason, it can be determined that the one with the air sheet interposed has the worst stable state, the one with the sand bag interposed has a medium stable state, and the one without any intervention has the best stable state.

  By the way, in the above test, evaluation is performed using the acceleration amplitude a when the mortar block is hit with a certain force F. Although it is difficult to strictly formulate the relationship between the force F for striking the mortar block and the acceleration amplitude a, it is assumed here that there is a relationship represented by the following equation (1). .

F = m × a + α
= M × a (1)
Here, F is the force that strikes the mortar block, m is the mass of the mortar block, a is the acceleration amplitude of the mortar block, α is the resultant force of the force that the impacted mortar block receives from the surrounding blocks And M represents the mass of the apparent mortar block. The value of the resultant force α varies depending on the constraint conditions. In this test, the value is small when the air sheet is sandwiched, and is large when there is no air sheet. The apparent mass M of the mortar block is a mass obtained by correcting the mass m of the mortar block in consideration of the influence of the resultant force α received from the mortar block.

  That is, as shown in FIG. 25, when an air sheet is interposed and a block with a small degree of restraint from the upper and lower blocks is hit, naturally the force received from the upper and lower blocks is small. On the other hand, when no air sheet is interposed, the force received from the upper and lower blocks is large. Therefore, the value of the resultant force α is larger under the condition not including the air sheet than the condition including the air sheet, and as a result, the apparent mass M of the equation (1) is increased. In other words, the striking block alone vibrates under the condition where the air sheet is interposed, while the surrounding blocks also vibrate together under the condition where the air sheet is not interposed. For this reason, when the block including the air sheet and the block not including the air sheet are hit with the same force, the value of the acceleration amplitude α is smaller in the condition where the apparent mass M is small and the air sheet is interposed than in the condition where the air sheet is not interposed. growing.

As shown in FIG. 22, the maximum acceleration amplitude value of the block including the air seat is 5.8 to 7.7 m / s ² , and the maximum acceleration amplitude value of the block not including the air seat is 0.9 to 3.8 m. At / s ² , the values are greatly different between the two different constraint conditions. This is considered to be because the apparent value of the mass M is greatly different between the two due to the difference in constraint conditions.

  According to the above equation (1), when the constraint condition is constant, that is, when the resultant force α is constant and the striking force increases, the maximum acceleration amplitude value a increases. However, in FIG. 22, the maximum acceleration amplitude value varies greatly under the conditions including the air sheet and the condition without the air sheet, and the maximum acceleration amplitude value increases as the impact force increases. There was no correlation. Under these conditions, the constraint conditions are not strictly constant but different, and the striking force is also different. The clear correlation between the striking force and the maximum acceleration amplitude value was not observed because the maximum acceleration amplitude value is more strongly affected by the apparent mass M determined by the constraint condition than the striking force.

  Further, as shown in FIG. 23, like the maximum acceleration amplitude value, the average frequency tends to vary greatly depending on the constraint conditions. Like the acceleration amplitude, the average frequency is also considered to change under the influence of the constraint condition as in equation (1), and is considered to depend more on the constraint condition than the striking force.

  Mortar block retaining walls and concrete block retaining walls are constructed by stacking blocks of almost uniform dimensions. On the other hand, stone walls generally have different stone sizes, and the variation is larger than that of mortar block retaining walls and concrete block retaining walls. Therefore, when applied to a stone wall, the difference in the mass m of the block in the equation (1) may affect the apparent mass M and adversely affect the evaluation result. For the purpose of confirming this, as shown in FIG. 26, the maximum acceleration amplitude value and average frequency when a mortar block having dimensions (mass) of 1 and 2 were struck with almost the same force were measured. The measurement results are shown in Table 1.

寸法（質量）が２倍異なった場合の最大加速度振幅値の差は１０％程度、平均振動数はやや大きく３０％程度であった。このことから、見かけの質量Ｍは、ｍが２倍変化しても１０〜３０％程度しか変化しないことがわかる。図２２や図２３に示したように、拘束条件の違いによって、エアシートを介在した条件とエアシートを介在しない条件の最大加速度振幅値や平均振動数の値は非常に大きく異なっている。先に、打撃力に比較して拘束条件の方が計測結果に及ぼす影響が大きいことを述べたが、質量ｍについても同様の傾向があるものと考えられる。

When the dimensions (mass) differed twice, the difference in maximum acceleration amplitude value was about 10%, and the average frequency was slightly large, about 30%. From this, it can be seen that the apparent mass M changes only about 10 to 30% even if m changes twice. As shown in FIG. 22 and FIG. 23, the maximum acceleration amplitude value and the average frequency value of the condition including the air sheet and the condition not including the air sheet are very different depending on the constraint condition. As described above, it has been described that the influence of the restraint condition on the measurement result is larger than that of the impact force, but it is considered that the mass m has the same tendency.

  Considering that the dimensional difference between the stone blocks that make up the stone wall is about twice (experienced to be this value), the evaluation accuracy is slightly reduced due to the difference in the size of the stone that makes up the stone wall. It is considered that there is no problem in practical use.

  Based on the above principle, the stable state evaluation apparatus according to claim 1 gives a striking force to an evaluation target structure to be evaluated for a stable state in a structure formed by stacking a plurality of structures. Acquisition means for acquiring acceleration response information indicating an acceleration response at the time, derivation of a maximum acceleration amplitude value that is a maximum value of acceleration amplitude from the acceleration response information acquired by the acquisition means, and acceleration from the acceleration response information Deriving means for deriving at least one of the average vibration frequencies per second of response, and at least one of the maximum acceleration amplitude value and the average frequency derived by the deriving means are predetermined. A determination means for determining a stable state of the structure to be evaluated based on a result of the comparison, and a determination result by the determination means And display means for displaying the to information.

  According to the stable state evaluation apparatus according to claim 1, an acceleration response when a striking force is applied to an evaluation target structure to be evaluated for a stable state in a structure formed by stacking a plurality of structures. Is obtained by the obtaining means.

  Here, in the present invention, the derivation unit derives the maximum acceleration amplitude value that is the maximum value of the acceleration amplitude from the acceleration response information acquired by the acquisition unit, and the acceleration response from the acceleration response information per second. At least one of derivation of an average frequency, which is an average value of the frequencies of, is performed, and at least one of the maximum acceleration amplitude value and the average frequency derived by the derivation means is determined in advance by the determination means. And the stable state of the structure to be evaluated is determined based on the result of the comparison.

  And in this invention, the information which shows the determination result by the said determination means is displayed by a display means. In addition, in the display by the display means, in addition to visible display by various display devices such as a liquid crystal display device, a plasma display device, an organic EL display device, and a CRT display device, permanent visible display by an image forming apparatus such as a printer device, An audible display by a voice output device such as a voice synthesizer is included.

  That is, in the present invention, based on the principle described above, the stable state of the structure to be evaluated is determined based on a comparison result between at least one of the maximum acceleration amplitude value and the average frequency and a predetermined threshold value. Therefore, the stable state of the structure can be evaluated easily and with high accuracy.

  Thus, according to the stable state evaluation apparatus of claim 1, the striking force is given to the evaluation target structure as the evaluation target of the stable state in the structure configured by stacking a plurality of structures. Acceleration response information indicating the acceleration response at the time is acquired, the maximum acceleration amplitude value that is the maximum value of the acceleration amplitude from the acquired acceleration response information, and the number of vibrations per second of the acceleration response from the acceleration response information At least one of derivation of the average frequency, which is an average value of the above, and comparing at least one of the derived maximum acceleration amplitude value and the average frequency with a predetermined threshold, and based on the result of this comparison Since the stable state of the structure to be evaluated is determined and information indicating the determination result is displayed by the display means, the stable state of the plurality of structures can be evaluated easily and with high accuracy. Can.

  In the present invention, as in the invention described in claim 2, the structure or a structure made of the same kind of material as the structure is regarded as being stable. A test model configured by having a plurality of restraints including a first restraint that can be performed and a second restraint that can be regarded as the structure is not stable. It is also possible to further comprise storage means for storing in advance the threshold value obtained by the test using, and the determination means reads out the threshold value from the storage means and performs the comparison.

  Here, the test model in the present invention may be configured by stacking a plurality of the structures, or may be configured using only one structure. FIG. 27 shows an example of a test model configured by using only one structure.

  The storage means includes a RAM (Random Access Memory), an EEPROM (Electrically Erasable and Programmable Read Only Memory), a semiconductor storage element such as a flash EEPROM (Flash EEPROM), a smart media (SmartMedia (registered trademark)), a flexible Examples include a portable recording medium such as a disk and a magneto-optical disk, a fixed recording medium such as a hard disk, or an external storage device provided in a server computer connected to a network.

  In particular, in the invention described in claim 2, as in the invention described in claim 3, the plurality of restraints is a restraint between the first restraint and the second restraint. The degree of restraint may be further included. Thereby, the stable state of the plurality of structures can be evaluated with higher accuracy.

  Further, according to a third aspect of the present invention, as in the fourth aspect of the present invention, in the test model, the installation state of the structure that becomes the first constraint degree is an inclusion between adjacent structures. The installation state of the structure that is the second constraint degree is a state in which an air sheet is interposed between adjacent structures, and the structure that is the third constraint degree is installed. The state may be a state in which sand bags are interposed between adjacent structures. Thereby, the stable state of the plurality of structures can be evaluated more easily.

  Incidentally, as shown in FIG. 22 as an example, the greater the maximum acceleration amplitude value is, the lower the degree of restraint of each structure is. As an example, as shown in FIG. The degree of restraint of an object becomes low.

  Therefore, according to the present invention, when the determination unit compares the maximum acceleration amplitude value with the threshold value as in the invention described in claim 5, the maximum acceleration amplitude value is equal to or more than the threshold value. When it is determined that the evaluation target structure is unstable and the average frequency is compared with the threshold value, the evaluation target structure is unstable when the average frequency is equal to or lower than the threshold value. It is good also as what determines with a certain thing. Thereby, the stable state of the plurality of structures can be evaluated more easily and with high accuracy.

  Incidentally, as shown in FIG. 24 as an example, the greater the sum of the normalized values of the maximum acceleration amplitude value and the average frequency, the lower the degree of constraint of each structure.

  Therefore, according to the present invention, when the determination unit compares both the maximum acceleration amplitude value and the average frequency with the threshold value as in the invention described in claim 6, the maximum acceleration amplitude value is determined. Is normalized so that the larger the value is, the larger the value is, and the smaller the average frequency is, the smaller the value is, the sum of the respective normalized values is determined in advance. It is determined that the evaluation target structure is unstable when it is equal to or greater than one threshold value, and the evaluation target structure is stable when the total value is equal to or smaller than a second threshold value that is smaller than the first threshold value. It is good also as what determines with what is carrying out. Thereby, the stable state of the plurality of structures can be evaluated with higher accuracy.

  Further, according to the present invention, when the maximum acceleration amplitude value is derived by the deriving unit as in the invention described in claim 7, the maximum value that can be taken by the maximum acceleration amplitude value is stored in advance, and the deriving unit When the average frequency is derived by the second storage means storing in advance a minimum value that the average frequency can take, at least one of the maximum acceleration amplitude value and the average frequency derived by the derivation means Is further converted into a value obtained by dividing by the corresponding maximum value or minimum value stored in the second storage means, and the determination means is converted by the conversion means. It is good also as what determines the stable state of the said evaluation object structure and the thing which is getting worse as the obtained value approaches 1. Thereby, the stable state of the plurality of structures can be quantitatively evaluated.

  In the present invention, the structure may be a concrete block, a mortar block, or a stone. Thereby, the stable state of the plurality of structures can be evaluated with higher accuracy.

  In the present invention, the hitting force may be given by an impulse hammer. Thereby, the stable state of the plurality of structures can be evaluated more easily.

  Further, as described above, according to the present invention, as in the invention described in claim 8, the average frequency is a boundary when the integrated value of the acceleration spectrum indicated by the acceleration response information is equally divided into two. It is good also as what is the frequency which becomes. Thereby, the stable state of the plurality of structures can be evaluated with higher accuracy.

  Further, as described above, according to the present invention, as in the invention according to claim 9, the acquisition unit acquires the acceleration response information in a state where the accelerometer is in contact with and does not adhere to the structure to be evaluated. It is good also as what to do. Thereby, the stable state of the structure can be evaluated without damaging the structure.

  On the other hand, in order to achieve the above-mentioned object, the stable state evaluation method according to claim 10 strikes an evaluation target structure as an evaluation target of a stable state in a structure formed by stacking a plurality of structures. Acceleration response information indicating an acceleration response when a force is applied is acquired, the maximum acceleration amplitude value that is the maximum value of the acceleration amplitude is derived from the acquired acceleration response information, and 1 second of the acceleration response from the acceleration response information At least one of derivation of an average frequency that is an average value of the hit frequency is performed, and at least one of the derived maximum acceleration amplitude value and the average frequency is compared with a predetermined threshold value. Based on the result, the stable state of the structure to be evaluated is determined, and information indicating the determination result is displayed by the display means.

  Therefore, according to the stable state evaluation method of the tenth aspect, since it operates in the same manner as the first aspect of the invention, the stable state of the plurality of structures can be simplified and simplified as in the first aspect of the invention. It can be evaluated with high accuracy.

  On the other hand, in order to achieve the above object, the stable state evaluation program according to claim 11 strikes an evaluation target structure as an evaluation target of a stable state in a structure formed by stacking a plurality of structures. An acquisition step for acquiring acceleration response information indicating an acceleration response when a force is applied, derivation of a maximum acceleration amplitude value that is a maximum value of acceleration amplitude from the acceleration response information acquired by the acquisition step, and the acceleration response A derivation step for deriving an average frequency that is an average value of the frequency per second of the acceleration response from the information, and at least the maximum acceleration amplitude value and the average frequency derived by the derivation step Judgment of comparing one with a predetermined threshold and determining the stable state of the structure to be evaluated based on the result of the comparison And step is intended to execute a display step of displaying, to a computer by the display means the information indicating the determination result by the determination step.

  Therefore, according to the stable state evaluation program of the eleventh aspect, the computer can be caused to act in the same manner as the first aspect of the invention, so that the plurality of structures are similar to the first aspect of the invention. The stable state can be evaluated easily and with high accuracy.

  According to the present invention, acceleration response information indicating an acceleration response when a striking force is applied to a structure to be evaluated that is an evaluation target of a stable state in a structure configured by stacking a plurality of structures is acquired. The maximum acceleration amplitude value that is the maximum value of the acceleration amplitude from the acquired acceleration response information, and the average frequency that is the average value of the vibration frequency per second of the acceleration response from the acceleration response information. At least one is performed, and at least one of the derived maximum acceleration amplitude value and the average frequency is compared with a predetermined threshold value, and a stable state of the evaluation target structure is determined based on a result of the comparison. Since the information indicating the determination result is displayed by the display means, the effect that the stable state of the plurality of structures can be evaluated easily and with high accuracy is obtained.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
First, the configuration of a stable state evaluation system 10 to which the present invention is applied will be described with reference to FIG.

  As shown in the figure, a stable state evaluation system 10 according to the present embodiment includes a personal computer (hereinafter referred to as “PC”) 12 that plays a central role in the system 10, an accelerometer 14, An impulse hammer 16, a dynamic strain amplifier 18, a data recorder 20, and a recording / output device 22 are provided.

  An output terminal that outputs acceleration information indicating the measurement result of acceleration of the accelerometer 14 and an output terminal that outputs striking force information indicating the striking force by the impulse hammer 16 are both connected to the input terminal of the dynamic strain amplifier 18. The output terminal of the dynamic strain amplifier 18 is connected to the input section of the data recorder 20. Accordingly, the acceleration information and the striking force information are amplified to a predetermined level range by the dynamic strain amplifier 18 and then recorded by the data recorder 20.

  On the other hand, the output unit of the data recorder 20 is connected to the input unit of the PC 12, while the output unit of the PC 12 is connected to the input unit of the recording / output device 22. Accordingly, the PC 12 can obtain the acceleration information and the striking force information recorded in the data recorder 20 while reading various information based on the acceleration information and the striking force information by the recording / output device 22. And can be output. In the stable state evaluation system 10 according to the present embodiment, the recording / output device 22 is a hard disk device for recording the various types of information, and a printer for outputting the various types of information. Needless to say, the device is not limited to this device as long as it can record or output various information.

  Next, with reference to FIG. 2, the configuration of the main part of the electrical system of the PC 12 having a particularly important role in this system will be described.

  As shown in the figure, the PC 12 according to the present embodiment includes a CPU (central processing unit) 12A that controls the operation of the entire PC 12, a RAM 12B that is used as a work area when the CPU 12A executes various processing programs, and the like. ROM 12C in which a control program, various parameters, and the like are stored in advance, a secondary storage unit (here, a hard disk device) 12D used for storing various information, a keyboard 12E used for inputting various information, A display 12F used for displaying various types of information and an input / output I / F (interface) 12G that controls transmission and reception of various signals between external devices and the like are provided. These units are connected by a system bus BUS. They are electrically connected to each other.

  Therefore, the CPU 12A accesses the RAM 12B, ROM 12C, and secondary storage unit 12D, acquires various input information via the keyboard 12E, displays various information on the display 12F, and an external device via the input / output I / F 12G. Various kinds of information can be exchanged between the two. The data recorder 20 and the recording / output device 22 described above are electrically connected to the input / output I / F 12G.

  On the other hand, FIG. 3 schematically shows main storage contents of the secondary storage unit 12D provided in the PC 12. As shown in the figure, the secondary storage unit 12D is provided with a database area DB for storing various databases and a program area PG for storing programs for performing various processes. .

  The database area DB includes a structure information database DB1 and a measurement information database DB2.

  In the structure information database DB1 according to the present embodiment, as schematically illustrated in FIG. 4 as an example, the structure number and the position information constitute the structure that is to be evaluated by the stable state evaluation system 10. It is comprised so that it may memorize | store for every structure to perform.

  The structure number information is information given in advance as different to each structure in order to identify each structure included in the structure to be evaluated.

  On the other hand, in the stable state evaluation system 10 according to the present embodiment, as schematically illustrated as an example in FIG. 5, the position of each structure included in the structure to be evaluated is set to a predetermined reference position. (In the example shown in the figure, the position of the structure located at the upper left corner point) is represented by an XY coordinate system with the origin coordinates (1, 1). For example, the position of the structure adjacent to the right side of the structure located at the reference position is (2, 1), and the position of the structure adjacent below the structure located at the reference position is (1, 1). 2).

  The position information in the structure information database DB1 is information indicating the position of the corresponding structure in the XY coordinate system. By referring to the database, an evaluation object as shown in FIG. 5 as an example. An image showing the structure can be schematically reproduced.

  On the other hand, in the measurement information database DB2 according to the present embodiment, as schematically illustrated in FIG. 6 as an example, each information of the structure number, the striking force, and the acceleration response is stored for each structure. It is configured as follows.

  The structure number information is the same as that of the structure information database DB1, and the impact force information is output from the impulse hammer 16 and stored in the data recorder 20 via the dynamic strain amplifier 18. The acceleration response information is output from the accelerometer 14 when the corresponding structure is struck with a corresponding striking force by the impulse hammer 16, and is output from the accelerometer 14 through the dynamic strain amplifier 18. This is information indicating the acceleration response recorded in.

  By the way, as shown in FIG. 1, in the stable state evaluation system 10 according to the present embodiment, among the plurality of structures in a structure (not shown) configured by stacking a plurality of structures. Acceleration response information indicating an acceleration response when the striking force is applied by the impulse hammer 16 to the structure 50 to be evaluated in the stable state is acquired by the accelerometer 14 and is indicated by the acquired acceleration response information. The maximum acceleration amplitude value that is the maximum value of the acceleration amplitude is derived, the derived maximum acceleration amplitude value is compared with a predetermined threshold value, and the stable state of the evaluation target structure 50 is determined based on the result of this comparison. It is supposed to be.

  For this reason, in the stable state evaluation system 10, the test model shown in FIGS. 20 and 21 is prepared in advance using a structure composed of the same kind of material as the structure 50 to be evaluated, and referring to FIG. The test using the test model is performed according to the procedure described above. Then, using the striking force and the maximum acceleration amplitude value obtained by the test, a graph showing the relationship between the striking force and the maximum acceleration amplitude value similar to that shown in FIG. 22 is created as an example, and the degree of restraint is low. The threshold value T is a value between the maximum acceleration amplitude value obtained in the state (the state where the air seat is interposed) and the maximum acceleration amplitude value obtained in the state where the degree of restraint is high (the state where there is no inclusion). Pre-stored in a predetermined area of the secondary storage unit 12D.

  In the stable state evaluation system 10 according to the present embodiment, the above test is performed on a plurality of structures. However, the present invention is not limited to this, and the above test may be performed only on one structure. Good.

  In the stable state evaluation system 10 according to the present embodiment, as the threshold value T, the minimum value of the maximum acceleration amplitude value obtained with a low degree of restraint and the maximum acceleration amplitude obtained with a high degree of restraint. The center value of the maximum value is applied, but not limited to this, for example, the minimum value of the maximum acceleration amplitude value obtained when the degree of restraint is low, or obtained when the degree of restraint is low. A value obtained by multiplying the difference between the minimum value of the maximum acceleration amplitude value obtained and the maximum value of the maximum acceleration amplitude value obtained with a high degree of restraint by a value greater than 0 and less than 1 is constrained. Obtained by subtracting from the minimum value of the maximum acceleration amplitude value obtained in a low degree state and applying a value obtained by subtracting the minimum value of the maximum acceleration amplitude value obtained in a low degree of restraint state and applying a value that is high. Any value that is between the maximum values of the maximum acceleration amplitude values It is possible to use.

  Further, the graph is not necessarily required, and the threshold T is calculated by calculation using the maximum acceleration amplitude value obtained in the state where the degree of restraint is low and the maximum acceleration amplitude value obtained in the state where the degree of restraint is high. Needless to say, it may be calculated.

  Next, the operation of the stable state evaluation system 10 according to the present embodiment will be described. Here, the structure to be evaluated by the stable state evaluation system 10 is a plurality of concrete blocks (hereinafter referred to as “evaluation target blocks”) in a concrete block stacking wall (hereinafter referred to as “evaluation target retaining wall”). ”) Will be described.

  First, the operation of the stable state evaluation system 10 when acquiring acceleration response information in a plurality of evaluation target blocks will be described.

  At this time, the worker sets the sensor unit of the accelerometer 14 in contact with any one of the plurality of blocks to be evaluated (not bonded), and then evaluates with the impulse hammer 16. Give hitting force to the block.

  The acceleration information indicating the measurement result of the acceleration is output from the accelerometer 14 according to the application of the hitting force, while the hitting force information indicating the hitting force is output from the impulse hammer 16.

  The acceleration information and the striking force information are amplified to a predetermined level range by the dynamic strain amplifier 18 and then recorded by the data recorder 20. At this time, since the acceleration information is sequentially output in real time from the accelerometer 14 in time series immediately after the impact force is applied by the impulse hammer 16, this is recorded in the data recorder 20 as acceleration response information.

  The worker performs striking on the evaluation target block with the impulse hammer 16 in a predetermined order. As a result, the striking force information and the acceleration response information are recorded in the data recorder 20 in the predetermined order, so that the PC 12 associates with the corresponding structure number according to the order recorded in the data recorder 20. In this state, the striking force information and the acceleration response information are registered in the measurement information database DB2.

  By the above process, the measurement information database DB2 shown in FIG. 6 is constructed as an example.

  Next, with reference to FIG. 7, the operation of the stable state evaluation system 10 according to the present embodiment when the stable state of the evaluation target block is evaluated using the measurement information database DB2 constructed by the above procedure will be described. To do. 7 shows a stable state that is executed by the CPU 12A of the PC 12 when an instruction to execute the evaluation of the stable state is input by the user via an input device (not shown) such as a keyboard provided in the PC 12. It is a flowchart which shows the flow of a process of an evaluation process program, and the said program is previously memorize | stored in the program area | region PG of secondary storage part 12D. Here, a case will be described in which the structure information database DB1 and the measurement information database DB2 are constructed in advance in order to avoid complications.

  In step 100 in the figure, the threshold value T is read from the secondary storage unit 12D, and in the next step 102, striking force information and acceleration response information corresponding to any one evaluation target block are read from the measurement information database DB2.

  In the next step 104, the maximum acceleration amplitude value K is derived from the read acceleration response information, and in the next step 106, is the derived maximum acceleration amplitude value K equal to or greater than the threshold value T read by the processing of step 100 above? If the determination is negative and the determination is affirmative, the process proceeds to step 108, and the degree of restraint of the evaluation target block is relatively low in association with the structure number of the evaluation target block being processed at this time. (Hereinafter referred to as “constraint degree defect information”) is stored in a predetermined area of the secondary storage unit 12D, and then the process proceeds to step 110. If the determination at step 106 is negative, the process proceeds to step 110 without executing the process at step 108.

  In step 110, it is determined whether or not the processing of step 102 to step 108 has been completed for all the evaluation target blocks. If the determination is negative, the process returns to step 102. 112. Note that, when the processes in steps 102 to 110 are repeatedly executed, an evaluation target block that has not been processed until then is set as a processing target.

  In step 112, all the constraint degree failure information stored by the above processing is read from the secondary storage unit 12D, and all the structure number information and position information regarding the evaluation target retaining wall are read from the structure information database DB1, The information indicating the result screen indicating the evaluation result in a predetermined format based on the read information is configured, and in the next step 114, the result screen is displayed on the display 12F based on the configured information. Thereafter, the stable state evaluation processing program is terminated.

  FIG. 8 shows an example of the display state of the result screen displayed on the display 12F by the process of step 114 of the stable state evaluation processing program. As shown in the figure, in the stable state evaluation processing program according to the present embodiment, the rectangular area indicating the evaluation target block in which the constraint degree defect information is stored is set to a state different from the rectangular areas of the other blocks. it's shown. Therefore, the user of the stable state evaluation system 10 can easily visually identify which evaluation target block is relatively inferior to the other blocks by referring to the result screen. Can grasp.

  As described above in detail, in the present embodiment, acceleration when a striking force is applied to a structure to be evaluated that is an object to be evaluated in a stable state in a structure formed by stacking a plurality of structures. Obtaining acceleration response information indicating a response, deriving a maximum acceleration amplitude value that is the maximum value of acceleration amplitude from the acquired acceleration response information, comparing the derived maximum acceleration amplitude value with a predetermined threshold, Since the stable state of the structure to be evaluated is determined based on the result of this comparison and information indicating the determination result is displayed, the stable state of the plurality of structures can be evaluated easily and with high accuracy. it can.

  Further, in the present embodiment, a structure composed of the same type of material as the structure is first restrained so that the structure can be regarded as stable, and the structure is stable. A stable state using a threshold value obtained by a test using a test model constructed by installing a plurality of restraints including two restraints of a second restraint that can be regarded as not being Therefore, the stable state of the plurality of structures can be evaluated with higher accuracy.

  In particular, in the present embodiment, the plurality of restraint degrees further include a third restraint degree that is a restraint degree between the first restraint degree and the second restraint degree. The stable state of the plurality of structures can be evaluated.

  In the present embodiment, in the test model, the installation state of the structure that is the first constraint degree is a state in which no inclusion is present between adjacent structures, and the second constraint degree is obtained. The installation state of the structure is a state in which an air sheet is interposed between adjacent structures, and the installation state of the structure that is the third constraint degree is that a sand bag is interposed between adjacent structures. Therefore, the stable state of the plurality of structures can be more easily evaluated.

  In the present embodiment, since the evaluation target structure is determined to be unstable when the maximum acceleration amplitude value is greater than or equal to the threshold value, the plurality of structures can be more easily and accurately detected. The stable state can be evaluated.

  Moreover, in this Embodiment, since the said structure shall be a concrete block, the stable state of a concrete block can be evaluated.

  Moreover, in this Embodiment, since the said striking force shall be given by an impulse hammer, the stable state of these structures can be evaluated more easily.

  Furthermore, in the present embodiment, since the acceleration response information is acquired in a state where the accelerometer is in contact with the structure to be evaluated and not adhered, the stable state of the structure is not damaged. Can be evaluated.

[Second Embodiment]
In the second embodiment, a description will be given of an example in the case of evaluating the stable state of a structure using the average frequency. The configuration of the stable state evaluation system 10 according to the second embodiment and the data structures of the databases DB1 and DB2 are the same as those according to the first embodiment (see FIGS. 1 to 6). Since it is the same, description here is abbreviate | omitted.

  In the stable state evaluation system 10 according to the present second embodiment, a stable state evaluation object of a plurality of structures in a structure (not shown) configured by stacking a plurality of structures is used. Acceleration response information indicating an acceleration response when a striking force is applied to the evaluation target structure 50 by the impulse hammer 16 is acquired by the accelerometer 14, and an acceleration response per second indicated by the acquired acceleration response information is acquired. Deriving an average frequency that is an average value of the frequencies, comparing the derived average frequency with a predetermined threshold value, and determining the stable state of the evaluation target structure 50 based on the result of this comparison It is said that.

  For this reason, in the stable state evaluation system 10 according to the second embodiment, the test model shown in FIGS. 20 and 21 is used by using a structure that is configured in advance with the same type of material as the structure 50 to be evaluated. The test using the test model is performed according to the procedure described above with reference to FIG. Then, using the striking force and average frequency obtained by the test, a graph showing the relationship between the striking force and the average frequency similar to that shown in FIG. 23 as an example is created, and the degree of restraint is low ( Secondary storage using a value between the average frequency obtained with the air sheet interposed) and the average frequency obtained with a high degree of restraint (state without inclusions) as a threshold T ′ It is stored in advance in a predetermined area of the part 12D.

  In the stable state evaluation system 10 according to the second embodiment, the above test is performed on a plurality of structures. However, the present invention is not limited to this, and the above test is performed only on one structure. It may be a thing.

  Further, in the stable state evaluation system 10 according to the second exemplary embodiment, the threshold T ′ is obtained in the state where the maximum value of the average frequency obtained in a state where the degree of restraint is low and the degree of restraint is high. The center value of the minimum value of the average frequency is applied, but not limited to this, for example, the maximum value of the average frequency obtained in a state where the degree of restraint is low or the state where the degree of restraint is low The value obtained by multiplying the difference between the maximum value of the obtained average frequency and the minimum value of the average frequency obtained with a high degree of restraint by a value greater than 0 and less than 1, The maximum value of the average frequency obtained with a low degree of restraint, such as the form of applying a value added to the maximum value of the average frequency obtained with a low state, and the average obtained with a high degree of restraint Any value can be applied as long as it is an intermediate value between the minimum values of the frequencies.

  Further, the graph is not necessarily required, and the threshold T ′ is calculated by calculation using the average frequency obtained in the state of low restraint by the test and the average frequency obtained in the state of high restraint. Needless to say, it is possible to adopt a form to do.

  Next, the operation of the stable state evaluation system 10 according to the second embodiment will be described. Here, a case will be described in which the structure to be evaluated by the stable state evaluation system 10 is a plurality of concrete blocks (evaluation target blocks) in a concrete block stacking retaining wall (evaluation target retaining wall). In addition, in the stable state evaluation system 10 according to the second embodiment, the action when acquiring the acceleration response information in the plurality of evaluation target blocks is the same as the stable state evaluation system 10 according to the first embodiment. Since it is the same, description here is abbreviate | omitted.

  Hereinafter, the operation of the stable state evaluation system 10 according to the second exemplary embodiment when evaluating the stable state of the evaluation target block will be described with reference to FIG. Note that steps that perform the same processing as in FIG. 7 in FIG. 9 are assigned the same step numbers as in FIG. 7, and descriptions thereof are omitted.

  In step 100 ′ of FIG. 10, the threshold value T ′ is read from the secondary storage unit 12D. In step 104 ′, the average frequency S is derived from the acceleration response information read out by the processing of step 102, and the next step 106 ′. In the above, it is determined whether or not the derived average frequency S is equal to or less than the threshold value T ′ read out in the process of step 100 ′. If the determination is affirmative, the process proceeds to step 108, but the determination is negative. If YES, the process proceeds to step 110 without executing the process of step 108.

  As described above in detail, in the second embodiment, a striking force is given to the evaluation target structure to be evaluated for the stable state in the structure configured by stacking a plurality of structures. Acceleration response information indicating the acceleration response at the time is acquired, and an average frequency that is an average value of the frequency per second of the acceleration response is derived from the acquired acceleration response information, and the derived average frequency is predetermined. The stable state of the structure to be evaluated is determined based on the result of the comparison, and information indicating the determination result is displayed. Therefore, the stable state of the plurality of structures can be simplified. In addition, it can be evaluated with high accuracy.

  Further, in the second embodiment, the structure constituted by the same kind of material as the structure is a first constraint degree that allows the structure to be regarded as being stable, and the structure. Using a threshold obtained by testing using a test model constructed by installing a plurality of restraints, including two restraints of a second restraint that can be regarded as unstable Therefore, the stable state of the plurality of structures can be evaluated with higher accuracy.

  In particular, in the second embodiment, the plurality of restraints include a third restraint that is a restraint between the first restraint and the second restraint. The stable state of the plurality of structures can be evaluated with high accuracy.

  In the second embodiment, in the test model, the installation state of the structure having the first constraint degree is a state in which no inclusions exist between adjacent structures, and the second constraint The installation state of the structure is a state in which an air sheet is interposed between adjacent structures, and the installation state of the structure that is the third constraint degree is a sand bag between adjacent structures. Therefore, it is possible to more easily evaluate the stable state of the plurality of structures.

  In the second embodiment, since the evaluation target structure is determined to be unstable when the average frequency is less than or equal to the threshold value, the plurality of the plurality of simpler and more accurate results. The stable state of the structure can be evaluated.

  In the second embodiment, since the structure is a concrete block, the stable state of the concrete block can be evaluated.

  In the second embodiment, since the impact force is given by an impulse hammer, the stable state of the plurality of structures can be more easily evaluated.

  Furthermore, in the second embodiment, since the acceleration response information is acquired in a state where the accelerometer is brought into contact with and not adhered to the evaluation object structure, the structure is not damaged. The stable state can be evaluated.

[Third Embodiment]
In the third embodiment, an example in which the stable state of a structure is evaluated using both the maximum acceleration amplitude value and the average frequency will be described. The configuration of the stable state evaluation system 10 according to the third embodiment and the data structures of the databases DB1 and DB2 are the same as those according to the first embodiment (see FIGS. 1 to 6). Since it is the same, description here is abbreviate | omitted.

  In the stable state evaluation system 10 according to the third exemplary embodiment, a stable state evaluation object of the plurality of structures in a structure (not shown) configured by stacking a plurality of structures is used. The acceleration response information indicating the acceleration response when the striking force is applied to the evaluation target structure 50 by the impulse hammer 16 is acquired by the accelerometer 14 and is the maximum value of the acceleration amplitude indicated by the acquired acceleration response information. A maximum acceleration amplitude value and an average frequency that is an average value of the vibration frequency per second of the acceleration response indicated by the acceleration response information are derived, and predetermined values are determined based on the derived maximum acceleration amplitude value and the average vibration frequency. The comparison with the obtained threshold is performed, and the stable state of the evaluation target structure 50 is determined based on the result of the comparison.

  In particular, in the stable state evaluation system 10 according to the third embodiment, the maximum acceleration amplitude value is normalized so as to increase as the value increases, and the average frequency decreases as the value increases. When the sum of the normalized values is equal to or greater than a predetermined threshold TU, it is determined that the evaluation target structure 50 is unstable, and the sum is greater than the threshold TU. When the threshold value TL is a small value or less, it is determined that the structure to be evaluated 50 is stable, and the total value is not less than the threshold value TM1 that is a range between the threshold value TL and the threshold value TU and not more than the threshold value TM2. If it is, it is determined that the stability of the evaluation target structure 50 is medium.

  For this reason, in the stable state evaluation system 10 according to the third embodiment, the test model shown in FIGS. 20 and 21 is used by using a structure that is configured in advance with the same type of material as the structure 50 to be evaluated. The test using the test model is performed according to the procedure described above with reference to FIG. Then, using the striking force, the maximum acceleration amplitude value, and the average frequency obtained by the test, create a graph showing the relationship between the striking force similar to that shown in FIG. Based on the graph, threshold values TL, TM1, threshold value TM2, and threshold value TU are derived and stored in advance in a predetermined area of the secondary storage unit 12D.

  In the stable state evaluation system 10 according to the third embodiment, the degree of restraint is the threshold value TU among the total values obtained in a state where the degree of restraint is low (a state in which an air seat is interposed). Applying a minimum value larger than the maximum value of the total value obtained in an intermediate state (a state in which sand bags are interposed), the threshold value TL is obtained in a state with a high degree of restraint (a state without inclusions). Among the obtained total values, a maximum value smaller than the minimum value of the total values obtained in a state where the degree of restraint is medium is applied, and the threshold values TM1 and TM2 are obtained in a state where the degree of restraint is medium. The threshold value that defines the maximum range in which only the above summed value exists is applied.

  However, the threshold values are not limited to the above, and the threshold value TM1 and the threshold value TM2 are applied with threshold values that define a range narrower than the maximum range, and the threshold value TU is the sum obtained with a low degree of constraint. Among the values, a mode in which a value larger by a predetermined value than a minimum value larger than the maximum value of the combined value obtained in a state where the degree of restraint is medium is applied, and the threshold TL was obtained in a state where the degree of restraint is high In the graph shown in FIG. 24 as an example, such as a form in which a value smaller than the maximum value smaller than the minimum value of the total value obtained in a state where the degree of constraint is medium is applied among the above total values, Between each sum value of the sum value obtained in a state where the degree is low, the sum value obtained in a state where the degree of restraint is medium, and the sum value obtained in a state where the degree of restraint is high, Does not include other combined values If a threshold value may be classified urchin can be applied any threshold.

  Further, the graph is not necessarily required, and the total value obtained in a state where the degree of restraint is low by the test, the sum value obtained in a state where the degree of restraint is medium, and the state obtained when the degree of restraint is high It goes without saying that each threshold value may be calculated by an operation using the obtained summed value.

  Next, the operation of the stable state evaluation system 10 according to the third embodiment will be described. Here, a case will be described in which the structure to be evaluated by the stable state evaluation system 10 is a plurality of concrete blocks (evaluation target blocks) in a concrete block stacking retaining wall (evaluation target retaining wall). Further, in the stable state evaluation system 10 according to the third embodiment, the action when acquiring the acceleration response information in the plurality of evaluation target blocks is the same as the stable state evaluation system 10 according to the first embodiment. Since it is the same, description here is abbreviate | omitted.

  Hereinafter, the operation of the stable state evaluation system 10 according to the third exemplary embodiment when evaluating the stable state of the evaluation target block will be described with reference to FIG. FIG. 10 shows a stable state executed by the CPU 12A of the PC 12 when a user inputs a stable state evaluation instruction via an input device (not shown) such as a keyboard provided in the PC 12. It is a flowchart which shows the flow of a process of an evaluation process program, and the said program is previously memorize | stored in the program area | region PG of secondary storage part 12D. Here, a case will be described in which the structure information database DB1 and the measurement information database DB2 are constructed in advance in order to avoid complications.

  In step 200 in the figure, the threshold value TL, threshold value TM1, threshold value TM2, and threshold value TU are read from the secondary storage unit 12D, and in the next step 202, the striking force information corresponding to all the evaluation target blocks from the measurement information database DB2. And acceleration response information is read.

  In the next step 204, the maximum acceleration amplitude value K and the average frequency S of all the evaluation target blocks are derived from the read acceleration response information, and in the next step 206, the derived maximum acceleration amplitude value of each evaluation target block is derived. K and average frequency S are normalized. In the stable state evaluation processing program according to the third embodiment, as the normalization, as in the normalization described with reference to FIG. 24, the maximum acceleration amplitude value K is expressed by the following (2). Normalization is applied so that the maximum value is 1 and the minimum value is 0 according to the formula. For the average frequency S, normalization is applied so that the maximum value is 0 and the minimum value is 1 according to the following formula (3). is doing. In Equation (2), MaxK is the maximum value of the maximum acceleration amplitude value K in all evaluation target blocks, MinK is the minimum value of the maximum acceleration amplitude value K in all evaluation target blocks, and K ′ is after normalization. Represents the maximum acceleration amplitude value. In Equation (3), MaxS is the maximum value of the average frequency S in all the evaluation target blocks, MinS is the minimum value of the average frequency S in all the evaluation target blocks, and S ′ is the average after normalization. Each frequency is represented.

そして、次のステップ２０８では、次の（４）式により、評価対象ブロック毎に正規化後の最大加速度振幅値Ｋ’及び平均振動数Ｓ’の合算値Ｇを算出する。

Then, in the next step 208, the summed value G of the maximum acceleration amplitude value K ′ and the average frequency S ′ after normalization is calculated for each evaluation target block by the following equation (4).

次のステップ２１０では、上記ステップ２０８の処理によって得られた何れか１つの評価対象ブロック（以下、「判定対象ブロック」という。）に対応する合算値Ｇが上記ステップ２００の処理によって読み出した閾値ＴＬ以下であるか否かを判定し、肯定判定となった場合はステップ２１２に移行して、判定対象ブロックの構造物番号に関連付けて、当該判定対象ブロックの拘束度が相対的に高いことを示す情報（以下、「拘束度良好情報」という。）を二次記憶部１２Ｄの所定領域に記憶し、その後にステップ２２４に移行する。

In the next step 210, the threshold value TL obtained by reading the sum G corresponding to any one evaluation target block (hereinafter referred to as “determination target block”) obtained by the process of step 208 by the process of step 200. It is determined whether or not it is the following, and if the determination is affirmative, the process proceeds to step 212 and indicates that the degree of constraint of the determination target block is relatively high in association with the structure number of the determination target block. Information (hereinafter referred to as “constraint degree good information”) is stored in a predetermined area of the secondary storage unit 12D, and then the process proceeds to step 224.

  On the other hand, if a negative determination is made in step 210, the process proceeds to step 214, and whether or not the total value G corresponding to the determination target block is not less than the threshold TM1 read by the process of step 200 and not more than the threshold TM2. If the determination is affirmative and the determination is affirmative, the process proceeds to step 216 and is associated with the structure number of the determination target block and indicates that the degree of restraint of the determination target block is relatively medium ( Hereinafter, “constraint degree intermediate information”) is stored in a predetermined area of the secondary storage unit 12D, and then the process proceeds to step 224.

  On the other hand, if a negative determination is made in step 214, the process proceeds to step 218, in which it is determined whether or not the sum G corresponding to the determination target block is equal to or greater than the threshold value TU read out in the process of step 200. If the determination is made, the process proceeds to step 220 and is associated with the structure number of the determination target block and indicates that the degree of constraint of the determination target block is relatively low (hereinafter referred to as “constraint degree defect information”). .) Is stored in a predetermined area of the secondary storage unit 12D, and then the process proceeds to step 224.

  On the other hand, when a negative determination is made in step 218, the process proceeds to step 222, and information indicating that the degree of constraint of the determination target block is indefinite in association with the structure number of the determination target block (hereinafter, “ "Constraint degree indefinite information") is stored in a predetermined area of the secondary storage unit 12D, and then the process proceeds to step 224.

  In step 224, it is determined whether or not the processing in steps 210 to 222 has been completed for all the evaluation target blocks. If the determination is negative, the process returns to step 210, but the step is performed when the determination is affirmative. 226. Note that, when the processes of Step 210 to Step 224 are repeatedly executed, an evaluation target block that has not been set as a processing target until then is set as a determination target block.

  In step 226, all the goodness-of-constraint information, the middle-degree of restraint information, the low-degree of restraint information, and the indefinite degree of restraint information stored by the above processing are read from the secondary storage unit 12D and evaluated from the structure information database DB1. Read all the structure number information and position information about the target retaining wall, configure information indicating a result screen showing the evaluation result in a predetermined format based on the read information, and in the next step 228, The result screen is displayed on the display 12F based on the configured information, and then the stable state evaluation processing program is terminated.

  FIG. 11 shows an example of the display state of the result screen displayed on the display 12F by the process of step 228 of the stable state evaluation processing program. As shown in the figure, in the stable state evaluation processing program according to the present embodiment, a rectangular frame indicating an evaluation target block in which goodness-of-constraint information is stored and an evaluation target in which intermediate-constraint information is stored A rectangular frame indicating a block, a rectangular frame indicating an evaluation target block storing constraint degree defect information, and a rectangular area indicating an evaluation target block storing constraint degree indefinite information are displayed in different states. ing. Accordingly, the user of the stable state evaluation system 10 can easily visually grasp which evaluation target block is in a relatively stable state by referring to the result screen. .

  As described above in detail, in the present embodiment, acceleration when a striking force is applied to a structure to be evaluated that is an object to be evaluated in a stable state in a structure formed by stacking a plurality of structures. Acceleration response information indicating a response is acquired, the maximum acceleration amplitude value that is the maximum value of the acceleration amplitude is obtained from the acquired acceleration response information, and the average value of the frequency per second of the acceleration response from the acceleration response information The average vibration frequency is derived, the derived maximum acceleration amplitude value and the average vibration frequency are compared with a predetermined threshold value, and the stable state of the structure to be evaluated is determined based on the result of this comparison. Since the determination and the information indicating the determination result are displayed, the stable state of the plurality of structures can be evaluated easily and with high accuracy.

  Further, in the present embodiment, a structure composed of the same type of material as the structure is first restrained so that the structure can be regarded as stable, and the structure is stable. A stable state using a threshold value obtained by a test using a test model constructed by installing a plurality of restraints including two restraints of a second restraint that can be regarded as not being Therefore, the stable state of the plurality of structures can be evaluated with higher accuracy.

  In particular, in the present embodiment, the plurality of restraint degrees further include a third restraint degree that is a restraint degree between the first restraint degree and the second restraint degree. The stable state of the plurality of structures can be evaluated.

  In the present embodiment, in the test model, the installation state of the structure that is the first constraint degree is a state in which no inclusion is present between adjacent structures, and the second constraint degree is obtained. The installation state of the structure is a state in which an air sheet is interposed between adjacent structures, and the installation state of the structure that is the third constraint degree is that a sand bag is interposed between adjacent structures. Therefore, the stable state of the plurality of structures can be more easily evaluated.

  In the present embodiment, the maximum acceleration amplitude value is normalized so as to increase as the value increases, and the average frequency is normalized so as to decrease as the value increases. When the sum of normalized values is equal to or greater than a predetermined first threshold (here, threshold TU), it is determined that the structure to be evaluated is unstable, and the sum is the first value. Since it is determined that the evaluation target structure is stable when it is equal to or smaller than a second threshold value (here, threshold value TL) that is smaller than the threshold value, the plurality of structures can be stabilized with higher accuracy. The state can be evaluated.

  Moreover, in this Embodiment, since the said structure shall be a concrete block, the stable state of a concrete block can be evaluated.

  Moreover, in this Embodiment, since the said striking force shall be given by an impulse hammer, the stable state of these structures can be evaluated more easily.

  Furthermore, in the present embodiment, since the acceleration response information is acquired in a state where the accelerometer is in contact with the structure to be evaluated and not adhered, the stable state of the structure is not damaged. Can be evaluated.

  In the third embodiment, the region where the total value G is divided is divided into three regions: a region with a good degree of restriction, a region with a medium degree of restriction, and a region with a bad degree of restriction. In addition, although the case where the region where the degree of restraint is indefinite has been provided has been described, the present invention is not limited to this, and for example, the region is divided into the above three regions without providing the indefinite region. It can also be in the form. In this case, the maximum value of the total value obtained in a state where the degree of restraint is high and the state where the degree of restraint is medium are obtained as the threshold value indicating the boundary between the area where the degree of restraint is good and the area where the degree of restraint is medium Applying an average value with the minimum value of the total value, as a threshold value indicating the boundary position between the region where the degree of restraint is poor and the region where the degree of restraint is moderate, the minimum value of the sum value obtained in a state where the degree of restraint is low, The form which applies the average value with the maximum value of the total value obtained in the state with a moderate restraint can be illustrated.

  In this case, the number of segmented areas of the total value G is not limited to three, and the number of segmented areas can be increased to four or more by increasing the number of threshold values.

  In these cases, the same effects as in the present embodiment can be obtained.

[Fourth Embodiment]
In the fourth embodiment, an example will be described in which the maximum acceleration amplitude value is converted to a value with the maximum value being 1, and the stable state of the structure is evaluated using the value. The configuration of the stable state evaluation system 10 according to the fourth embodiment and the data structures of the databases DB1 and DB2 are the same as those according to the first embodiment (see FIGS. 1 to 6). Since it is the same, description here is abbreviate | omitted.

  In the stable state evaluation system 10 according to the present embodiment, a structure to be evaluated that is a target for evaluation of a stable state among the plurality of structures in a structure (not shown) configured by stacking a plurality of structures. The acceleration response information indicating the acceleration response when the impact force is applied to the object 50 by the impulse hammer 16 is acquired by the accelerometer 14, and the maximum acceleration amplitude which is the maximum value of the acceleration amplitude indicated by the acquired acceleration response information is acquired. This value is derived, the derived maximum acceleration amplitude value is converted into a value with the maximum value being 1, and the value (hereinafter referred to as “converted value”) is compared with a predetermined threshold value. Based on the result, the stable state of the evaluation target structure 50 is determined.

  For this reason, in the stable state evaluation system 10, the test model shown in FIG. 20 is produced in advance using a structure composed of the same kind of material as the structure 50 to be evaluated, and the procedure described above with reference to FIG. Then, a test using the test model is performed on a plurality of blocks in which air sheets are inserted in the lower part. Then, the maximum value of the maximum acceleration amplitude value obtained by the test is stored as a reference value M in a predetermined area of the secondary storage unit 12D in advance.

  As described above, in the stable state evaluation system 10 according to the fourth embodiment, the maximum acceleration amplitude value obtained for the block in which the air seat is inserted is applied as the reference value M. However, the present invention is not limited to this, and any value can be applied as the reference value M as long as the maximum acceleration amplitude value can be taken. However, the larger the reference value M, the smaller the converted value obtained by using this. Therefore, in order to make the reference value M an appropriate value, the test is performed under the condition that the block to be tested is not restricted as much as possible. It is preferable to apply the maximum acceleration amplitude value thus obtained as the reference value M. In the stable state evaluation system 10 according to the fourth embodiment, the above test is performed on a plurality of structures. However, the present invention is not limited to this, and the above test is performed only on one structure. It may be a thing.

  On the other hand, in the stable state evaluation system 10 according to the fourth embodiment, the possible range of the converted value is divided into a plurality of stages, and the stable state is defined for each divided range. In addition, in the stable state evaluation system 10 according to the fourth embodiment, the range that can be taken by the conversion value is divided into four stages. For this reason, as a threshold for dividing each stage, Three threshold values of threshold value T1, threshold value T2, and threshold value T3 are stored in advance in a predetermined area of the secondary storage unit 12D. In the stable state evaluation system 10 according to the fourth exemplary embodiment, the converted value is 1 at the maximum, and in order to make each segment range an equal range, 0.25 is set as the threshold T1, and 0.50 is set as the threshold T2. However, 0.75 is stored as the threshold value T3.

  It should be noted that the number of stages is not limited to four, and may be other stages, and the threshold values T1 to T3 are not limited to the above values, and may be other values.

  Next, the operation of the stable state evaluation system 10 according to the fourth embodiment will be described. Here, a case will be described in which the structure to be evaluated by the stable state evaluation system 10 is a plurality of concrete blocks (evaluation target blocks) in a concrete block stacking retaining wall (evaluation target retaining wall). Further, in the stable state evaluation system 10 according to the fourth embodiment, the action when acquiring the acceleration response information in a plurality of evaluation target blocks is the same as the stable state evaluation system 10 according to the first embodiment. Since it is the same, description here is abbreviate | omitted.

  Hereinafter, with reference to FIG. 12, the operation of the stable state evaluation system 10 according to the fourth exemplary embodiment when evaluating the stable state of the evaluation target block will be described. 12 shows a stable state that is executed by the CPU 12A of the PC 12 when a user inputs an instruction to execute the evaluation of the stable state via an input device (not shown) such as a keyboard provided in the PC 12. It is a flowchart which shows the flow of a process of an evaluation process program, and the said program is previously memorize | stored in the program area | region PG of secondary storage part 12D. Here, a case will be described in which the structure information database DB1 and the measurement information database DB2 are constructed in advance in order to avoid complications.

  In step 300 in the figure, the reference value M and threshold values T1 to T3 are read from the secondary storage unit 12D, and in the next step 302, the striking force information corresponding to any one evaluation target block from the measurement information database DB2 and Read acceleration response information.

  In the next step 304, the maximum acceleration amplitude value K is derived from the read acceleration response information, and in the next step 306, the calculated maximum acceleration amplitude value K and the read reference value M are substituted into the following equation (5). As a result, the conversion value K ′ is calculated.

なお、基準値Ｍを導出する際の測定誤差等に起因して、（５）式によって算出された換算値Ｋ’が１を越える可能性もあるが、この場合は、換算値Ｋ’を強制的に１とする。

Note that the conversion value K ′ calculated by the equation (5) may exceed 1 due to a measurement error or the like when deriving the reference value M. In this case, the conversion value K ′ is compulsory. Therefore, it is set to 1.

  In the next step 308, it is determined whether or not the converted value K ′ obtained by the process in step 306 is equal to or less than the threshold value T1 read by the process in step 300. The information indicating that the constraint level of the evaluation target block is the highest in association with the structure number of the evaluation target block to be processed (hereinafter referred to as “constraint level excellent information”) is stored in the secondary storage unit. The data is stored in a predetermined area of 12D, and then the process proceeds to step 322.

  On the other hand, if a negative determination is made in step 308, the process proceeds to step 312, where it is determined whether or not the converted value K ′ is equal to or less than the threshold value T2 read by the processing in step 300, and a positive determination is made. Shifts to step 314 and relates to the structure number of the evaluation target block to be processed, and indicates that the restriction degree of the evaluation target block is the second highest (hereinafter referred to as “constraint degree good information”). ) In the predetermined area of the secondary storage unit 12D, and then the process proceeds to step 322.

  On the other hand, if a negative determination is made in step 312, the process proceeds to step 316, in which it is determined whether or not the converted value K ′ is equal to or less than the threshold value T <b> 3 read out by the processing in step 300. Shifts to step 318 and associates with the structure number of the evaluation target block to be processed, and indicates that the restriction degree of the evaluation target block is the third highest (hereinafter referred to as “constraint degree intermediate information”). ) In the predetermined area of the secondary storage unit 12D, and then the process proceeds to step 322.

  On the other hand, when a negative determination is made in step 316, the process proceeds to step 320, and information indicating that the constraint degree of the evaluation target block is the lowest in association with the structure number of the evaluation target block to be processed ( Hereinafter, “constraint degree defect information”) is stored in a predetermined area of the secondary storage unit 12D, and then the process proceeds to step 322.

  In step 322, it is determined whether or not the processing in steps 302 to 320 has been completed for all the evaluation target blocks. If the determination is negative, the process returns to step 302. 324. Note that when the processes in steps 302 to 322 are repeatedly executed, an evaluation target block that has not been processed until then is set as a processing target.

  In step 324, all the constraint degree excellent information, the constraint degree good information, the constraint degree intermediate information, and the constraint degree defect information stored by the above processing are read from the secondary storage unit 12D and evaluated from the structure information database DB1. Read all the structure number information and position information about the target retaining wall, configure information indicating a result screen showing the evaluation result in a predetermined format based on the read information, and in the next step 326, The result screen is displayed on the display 12F based on the configured information, and then the stable state evaluation processing program is terminated.

  FIG. 13 shows an example of a display state of the result screen displayed on the display 12F by the process of step 326 of the stable state evaluation processing program. As shown in the figure, in the stable state evaluation processing program according to the present embodiment, a rectangular frame indicating an evaluation target block in which constraint degree excellent information is stored, and an evaluation target in which constraint degree good information is stored A rectangular frame indicating a block, a rectangular frame indicating an evaluation target block in which restraint degree intermediate information is stored, and a rectangular frame indicating an evaluation target block in which constraint degree defect information is stored are displayed in different states. ing. Accordingly, the user of the stable state evaluation system 10 can easily visually grasp which evaluation target block is in what stable state by referring to the result screen.

  As described above in detail, in the present embodiment, acceleration when a striking force is applied to a structure to be evaluated that is an object to be evaluated in a stable state in a structure formed by stacking a plurality of structures. Obtaining acceleration response information indicating a response, deriving a maximum acceleration amplitude value that is the maximum value of acceleration amplitude from the acquired acceleration response information, comparing the derived maximum acceleration amplitude value with a predetermined threshold, Since the stable state of the structure to be evaluated is determined based on the result of this comparison and information indicating the determination result is displayed, the stable state of the plurality of structures can be evaluated easily and with high accuracy. it can.

  In particular, in the present embodiment, a maximum value that can be taken by the maximum acceleration amplitude value is stored in advance, and the derived maximum acceleration amplitude value is converted to a value obtained by dividing by the maximum value, and obtained by the conversion. Since the stable value of the structure to be evaluated is determined to be worse as the value approaches 1, the stable state of the plurality of structures can be quantitatively evaluated.

  Moreover, in this Embodiment, since the said structure shall be a concrete block, the stable state of a concrete block can be evaluated.

  Moreover, in this Embodiment, since the said striking force shall be given by an impulse hammer, the stable state of these structures can be evaluated more easily.

  Furthermore, in the present embodiment, since the acceleration response information is acquired in a state where the accelerometer is in contact with the structure to be evaluated and not adhered, the stable state of the structure is not damaged. Can be evaluated.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. Various changes or improvements can be added to the above-described embodiment without departing from the gist of the present invention, and embodiments to which such changes or improvements are added are also included in the technical scope of the present invention.

  The above embodiments do not limit the invention according to the claims (claims), and all the combinations of features described in the embodiments are essential for the solution means of the invention. Is not limited. The above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. Even if some constituent requirements are deleted from all the constituent requirements shown in the above-described embodiment, as long as an effect is obtained, a configuration from which these several constituent requirements are deleted can be extracted as an invention.

  For example, in the fourth embodiment, the case where the maximum acceleration amplitude value is applied as the parameter to be evaluated has been described. However, the present invention is not limited to this, for example, as the parameter to be evaluated. It can also be set as the form which applies an average frequency. Also in this case, the same effect as that of the fourth embodiment can be obtained.

  In each of the above embodiments, a test model is prepared using a structure made of the same type of material as the block to be evaluated, and a test using the test model is performed, whereby each threshold value or standard is set. Although the case of deriving a value has been described, the present invention is not limited to this. For example, a test model is created using the same structure as the block to be evaluated, and the test using the test model is performed. It is also possible to adopt a form in which each threshold value and reference value are derived by performing the above. In this case, the stable state of the structure can be evaluated with higher accuracy than in the above embodiments.

  In each of the above embodiments, the case where a concrete block is applied as the structure of the present invention has been described. However, the present invention is not limited to this, and for example, a mortar block or a stone material is applied. It can also be in the form. Also in this case, the same effects as those of the above embodiments can be obtained.

  In addition, the configuration (see FIGS. 1 to 3) of the stable state evaluation system 10 described in each of the above embodiments is an example, and unnecessary portions may be deleted within a scope that does not depart from the gist of the present invention. Needless to say, you can add new parts.

  The data structures of the databases shown in the above embodiments (see FIGS. 4 and 6) are also examples, and unnecessary information can be deleted or newly created without departing from the gist of the present invention. Needless to say, you can add information.

  Further, the processing flow of the stable state evaluation processing program shown in each of the above embodiments (see FIGS. 7, 9, 10, and 12) is also an example, and within the scope not departing from the gist of the present invention, Needless to say, unnecessary steps can be deleted, new steps can be added, and the processing order can be changed.

  Furthermore, the configuration of the result screens shown in the above embodiments (see FIGS. 8, 11, and 13) is also an example, and it goes without saying that it can be changed without departing from the gist of the present invention.

It is a block diagram which shows the structure of the stable state evaluation system which concerns on embodiment. It is a block diagram which shows the principal part structure of the electrical system of PC which concerns on embodiment. It is a schematic diagram which shows the main memory content of the secondary memory | storage part with which the PC which concerns on embodiment was equipped. It is a schematic diagram which shows the data structure of the structure information database which concerns on embodiment. It is a figure with which it uses for description of the structure information database which concerns on embodiment, and is a front view of the structure which shows the specific example of structure number information and position information. It is a schematic diagram which shows the data structure of the measurement information database which concerns on embodiment. It is a flowchart which shows the flow of a process of the stable state evaluation processing program which concerns on 1st Embodiment. It is the schematic which shows the example of a display state of the result screen which concerns on 1st, 2nd embodiment. It is a flowchart which shows the flow of a process of the stable state evaluation processing program which concerns on 2nd Embodiment. It is a flowchart which shows the flow of a process of the stable state evaluation processing program which concerns on 3rd Embodiment. It is the schematic which shows the example of a display state of the result screen which concerns on 3rd Embodiment. It is a flowchart which shows the flow of a process of the stable state evaluation processing program which concerns on 4th Embodiment. It is the schematic which shows the example of a display state of the result screen which concerns on 4th Embodiment. FIG. 5 is a diagram for explaining the principle of the present invention, and is a perspective view showing a model using a mortar block produced for performing an experiment reproducing a state in which concrete blocks and stones are stacked with a high degree of restraint. It is a figure and a side view. FIG. 15 is a diagram for explaining the principle of the present invention and is a diagram showing an experimental result using the model of FIG. 14. FIG. 15 is a diagram for explaining the principle of the present invention and is a diagram showing an experimental result using the model of FIG. 14. FIG. 5 is a diagram for explaining the principle of the present invention, and is a perspective view showing a model using a mortar block produced for performing an experiment reproducing a state in which concrete blocks and stones are stacked in a state of low restraint. It is a figure and a side view. FIG. 18 is a diagram for explaining the principle of the present invention, and shows a result of an experiment using the model of FIG. 17. FIG. 18 is a diagram for explaining the principle of the present invention, and shows a result of an experiment using the model of FIG. 17. FIG. 4 is a diagram for explaining the principle of the present invention and is a schematic diagram showing a test model created by the inventors of the present invention. FIG. 4 is a diagram for explaining the principle of the present invention and is a schematic diagram showing a test model created by the inventors of the present invention. FIG. 22 is a diagram for explaining the principle of the present invention, and is a graph showing a relationship between a striking force and a maximum acceleration amplitude value obtained by a test using two types of test models of FIGS. 20 and 21. FIG. 22 is a diagram for explaining the principle of the present invention, and is a graph showing the relationship between the striking force and the average frequency obtained by the test using the two types of test models of FIGS. 20 and 21. FIG. 24 is a diagram for explaining the principle of the present invention and is a graph in which the maximum acceleration amplitude value and the average frequency shown in FIGS. 22 and 23 are normalized and added together and plotted on the vertical axis. It is a schematic diagram for explaining the principle of the present invention. FIG. 5 is a diagram for explaining the principle of the present invention, and is a model in which a maximum acceleration amplitude value and an average frequency are measured when a mortar block having dimensions (mass) of 1 and 2 is struck with almost the same force. FIG. It is an external view which shows the modification of a test model.

Explanation of symbols

10 stable state evaluation system 12 personal computer 12A CPU (derivation means, determination means, conversion means)
12B RAM
12C ROM
12D secondary storage (storage means, second storage means)
12E Keyboard 12F Display (display means)
12G I / O interface 14 Accelerometer (Acquisition means)
16 Impulse hammer 18 Dynamic strain amplifier 20 Data recorder 22 Recording / output device 50 Structure

Claims (11)

An acquisition means for acquiring acceleration response information indicating an acceleration response when a striking force is applied to an evaluation target structure that is an evaluation target of a stable state in a structure configured by stacking a plurality of structures;
Derivation of the maximum acceleration amplitude value that is the maximum value of the acceleration amplitude from the acceleration response information acquired by the acquisition means, and the average frequency that is the average value of the vibration frequency per second of the acceleration response from the acceleration response information Derivation means for performing at least one of derivation of
A comparison is made between at least one of the maximum acceleration amplitude value and the average frequency derived by the deriving means and a predetermined threshold value, and a stable state of the structure to be evaluated is determined based on a result of the comparison. A determination means;
Display means for displaying information indicating a determination result by the determination means;
A stable state evaluation apparatus. A first constraint degree that allows the structure or a structure made of the same type of material as the structure to be regarded as stable, and the structure is not stable Storage means for storing in advance the threshold value obtained by a test using a test model configured to have a plurality of restraints including two restraints of the second restraint that can be regarded as In addition,
The stable state evaluation apparatus according to claim 1, wherein the determination unit reads the threshold value from the storage unit and performs the comparison. The stable state evaluation apparatus according to claim 2, wherein the plurality of restraints further include a third restraint that is a restraint between the first restraint and the second restraint. In the test model, the installation state of the structure that becomes the first constraint degree is a state in which no inclusion exists between adjacent structures, and the installation state of the structure that becomes the second constraint degree is The state in which an air sheet is interposed between adjacent structures, and the installation state of the structure serving as the third constraint is a state in which sand bags are interposed between adjacent structures. Stable state evaluation device. The determination unit determines that the evaluation target structure is unstable when the maximum acceleration amplitude value is equal to or greater than the threshold when the maximum acceleration amplitude value is compared with the threshold, and the average 5. When comparing the vibration frequency with the threshold value, it is determined that the structure to be evaluated is unstable when the average vibration frequency is equal to or less than the threshold value. The described stable state evaluation apparatus. When the determination unit compares both the maximum acceleration amplitude value and the average frequency with the threshold value, the determination unit normalizes the maximum acceleration amplitude value so that the larger the value is, the larger the value is. The number is normalized so that the value becomes smaller as the value becomes larger, and the evaluation target structure is unstable when the sum of the normalized values is equal to or greater than a predetermined first threshold value. It determines with a thing, and it determines with the said evaluation object structure being stable when the said total value is below the 2nd threshold value which is a value smaller than the said 1st threshold value. The stable state evaluation apparatus according to item 1. When the maximum acceleration amplitude value is derived by the deriving means, a maximum value that the maximum acceleration amplitude value can be stored in advance, and when the average frequency is derived by the deriving means, the average frequency is taken. Second storage means for storing in advance a minimum value to be obtained;
A value obtained by dividing at least one of the maximum acceleration amplitude value and the average frequency derived by the deriving unit by the corresponding maximum value or the minimum value stored by the second storage unit. Further comprising a conversion means for converting,
The said determination means determines what is getting worse as the value obtained by conversion by the said conversion means approaches 1, and the stable state of the said evaluation object structure. The described stable state evaluation apparatus. The steady state evaluation according to any one of claims 1 to 7, wherein the average frequency is a frequency that becomes a boundary when an integrated value of an acceleration spectrum indicated by the acceleration response information is equally divided into two. apparatus. The stable state evaluation apparatus according to any one of claims 1 to 8, wherein the acquisition unit acquires the acceleration response information in a state in which an accelerometer is brought into contact with and not adhered to the evaluation target structure. Acceleration response information indicating an acceleration response when a striking force is applied to a structure to be evaluated in a stable state among the plurality of structures in a structure configured by stacking a plurality of structures. Get
At least one of derivation of the maximum acceleration amplitude value that is the maximum value of the acceleration amplitude from the acquired acceleration response information and derivation of the average frequency that is the average value of the frequency per second of the acceleration response from the acceleration response information And
Comparing at least one of the derived maximum acceleration amplitude value and the average frequency with a predetermined threshold, and determining the stable state of the structure to be evaluated based on the result of this comparison,
A stable state evaluation method in which information indicating the determination result is displayed by a display means. Acceleration response information indicating an acceleration response when a striking force is applied to a structure to be evaluated in a stable state among the plurality of structures in a structure configured by stacking a plurality of structures. An acquisition step to acquire,
Derivation of the maximum acceleration amplitude value that is the maximum value of the acceleration amplitude from the acceleration response information acquired by the acquisition step, and the average frequency that is the average value of the vibration frequency per second of the acceleration response from the acceleration response information A derivation step for performing at least one of derivation of
A comparison is made between at least one of the maximum acceleration amplitude value and the average frequency derived in the deriving step and a predetermined threshold value, and a stable state of the structure to be evaluated is determined based on a result of the comparison. A determination step;
A display step of displaying information indicating a determination result by the determination step by a display means;
A stable state evaluation program that causes a computer to execute.

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