JP2018062829A - Damage degree determination device and damage degree determination system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To determine damage degree of an industrialized structure rapidly and easily.SOLUTION: The damage degree determination device has: a natural frequency calculation unit for calculating, for an industrialized structure that can be designed by setting a part of design elements, a first natural frequency in a first predetermined period and calculating a second natural frequency in a second predetermined period after the first predetermined period; a change rate calculation unit for calculating a natural frequency change rate based on the first natural frequency and the second natural frequency; and a determination unit for determining a damage degree of the industrialized structure based on the natural frequency change rate and the part of design elements.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a damage degree determination device and a damage degree determination system that determine the degree of damage of an industrialized structure caused by an earthquake.

  Conventionally, structural health monitoring is known in which structural performance is determined based on a response waveform representing an acceleration time history of an earthquake or microtremor detected by an acceleration sensor.

  Moreover, the earthquake indicator of patent document 1 estimates the deformation amount of a structure based on the acceleration measured by the acceleration sensor, and displays an action guideline comment based on the deformation amount.

  The management system described in Patent Document 2 is based on the displacement angle of the structure calculated from the structure information stored in the structure information storage unit and the earthquake information including the acceleration record of the ground measured by the seismometer. To extract damage information.

JP 2014-85262 A JP 2012-37436 A

  In the methods described in Patent Documents 1 and 2, the ground information or the amount of deformation of the structure is estimated based on the acceleration measured by the acceleration sensor installed on the foundation of the building when an earthquake occurs. It does not measure the physical quantities involved. Therefore, the amount of deformation of the structure is determined without using any measurement information related to the earthquake response of the structure, and it is possible to accurately grasp the degree of damage indicating how much the structure is damaged. There was a possibility that it could not be done.

  Moreover, the method of patent document 1 and 2 determines the damage degree of a structure by performing a response calculation using the structure characteristic model intrinsic | native to a structure. However, when determining the degree of damage, a structural analysis model must be created for each structure, and the degree of damage cannot be determined quickly. In addition, it is conceivable to create a structure characteristic model in advance in order to quickly determine the degree of damage, but since there are many design elements for determining the structure of the structure, there are many design elements. It is not easy to store all of the individual structural property models that are configured in a memory or the like. In addition, since the deformation angle caused by the earthquake is calculated by structural calculation, if you encounter multiple earthquakes including aftershocks, in order to find the latest deformation angle, you must save all the earthquake information you have experienced. In other words, the capacity of the storage device becomes excessive.

  Therefore, the degree of damage to the structure cannot be determined quickly and easily, and the safety and convenience of the user may be impaired.

  The objective of this invention made | formed in view of this situation is providing the damage degree determination apparatus and damage degree determination system which can determine the damage degree of an industrialized structure quickly, easily and accurately.

  The damage degree determination apparatus as one aspect of the present invention uses the first natural frequency of a first predetermined period for an industrialized structure that can be designed by setting some design elements such as the arrangement of members. A natural frequency calculating unit for calculating and calculating a second natural frequency in a second predetermined period after the first predetermined period; the first natural frequency and the second natural vibration; And determining the degree of damage of the industrialized structure based on the change rate calculation unit that calculates the natural frequency change rate based on the number, the natural frequency change rate, and the part of the design elements. And a section.

  As one embodiment of the present invention, the natural frequency calculation unit is configured to perform the first based on the acceleration of the first predetermined period or the acceleration of the first floor and the acceleration of the upper floor that is an arbitrary hierarchy of two or more floors. It is preferable to calculate the second natural frequency based on the basic or first floor acceleration and the upper floor acceleration during the second predetermined period.

  As one embodiment of the present invention, the first predetermined period is a period from the time of new construction or renovation to the time before the occurrence of a horizontal force on the industrialized structure, and the second predetermined period. The period is preferably one period after the event ends.

  As one embodiment of the present invention, the first predetermined period is a period during which an event giving a horizontal force to the industrialized structure is occurring, and the second predetermined period is the It is preferable that the event is occurring and is one period after the first predetermined period.

  As one embodiment of the present invention, it is preferable that the determination unit determines the degree of damage of the industrialized structure based on a structure characteristic model generated by setting the partial design elements.

  As one embodiment of the present invention, the determination unit determines the deformation amount of the industrialized structure based on the structure characteristic model using the natural frequency change rate, and associates the deformation amount with the deformation amount. It is preferable to determine the damage degree of the industrialized structure by extracting the stored damage degree.

  A damage degree determination system as one aspect of the present invention includes a first accelerometer that measures the acceleration of a foundation or first floor of an industrialized structure that can be designed by setting some design elements, and the industrialized structure. A second accelerometer that measures the acceleration of the upper floor, which is an arbitrary floor above the second floor, and a damage degree determination device that determines the damage degree of the industrialized structure. The apparatus calculates a first natural frequency of the industrialized structure based on the acceleration measured by the first accelerometer and the acceleration measured by the second accelerometer during a first predetermined period. And the industrialization based on the acceleration measured by the first accelerometer and the acceleration measured by the second accelerometer in a second predetermined period after the first predetermined period. Second natural vibration of the structure A natural frequency calculation unit that calculates the natural frequency, a change rate calculation unit that calculates a natural frequency change rate based on the first natural frequency and the second natural frequency, and the natural frequency change rate And a determination unit that determines a degree of damage of the industrialized structure based on the part of the design elements.

  As one embodiment of the present invention, the apparatus further includes a display device that displays the damage degree determined by the damage degree determination device, the first and second accelerometers, the damage degree determination device, and the display device. It is preferable that a part or all of these are connected to each other via the Internet by wired or wireless communication to transmit and receive information.

  As one embodiment of the present invention, it is preferable to further include a server that receives information on the degree of damage related to one or more industrialized structures from the damage level determination device via a network.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to determine the damage degree of an industrialized structure quickly, easily, and with sufficient precision.

It is a figure which shows schematic structure of the damage degree determination system of 1st Embodiment. It is a figure which shows the change of the natural frequency by a vibration experiment. It is a figure which shows the member characteristic model showing the relationship between the horizontal force applied to a member, and the deformation amount of this member. It is a figure which shows the structure characteristic model showing the relationship between the horizontal force applied to the whole structure, and the deformation amount of this structure.

(First embodiment)
A first embodiment of the present invention will be described below with reference to the drawings.

  The damage degree determination system 1 according to the present embodiment determines the safety of an industrialized structure. Here, the industrialized structure is a structure in which a part or all of the members are standardized, for example, manufactured in advance in a factory and built by a prefabricated method that is assembled at a construction site, and includes, for example, a building, a bridge, and the like. The industrialized structure can be designed by setting some design elements such as the arrangement of the members. By standardizing design elements that constitute industrialized structures, it is possible to reduce the number of design elements that should be set when constructing industrialized structures while securing a certain degree of architectural freedom. The design elements include members constituting the structure, model, structure type, floor number, aspect ratio, structure size, use, and the like. The member includes a structural member and a non-structural member. Structural members include bearing walls, columns, column base members, beams, joint members, and the like. Non-structural members include interior walls, book walls, and the like. Examples of the structure format include a wall-type structure, a ramen structure format, and a brace structure format. The use is, for example, a detached house, an apartment house, a combined house and the like. In the following description, the industrialized structure is also referred to as “structure”.

  As shown in FIG. 1, the damage degree determination system 1 according to the present embodiment includes a first accelerometer 10 a, a second accelerometer 10 b, a damage degree determination apparatus 20, a display apparatus 30, and a server 40. Part or all of the first accelerometer 10a, the second accelerometer 10b, the display device 30, and the server 40 are connected to the damage degree determination device 20 via a communication cable, a wireless communication network such as the Internet, an intranet, or the like. To send and receive information to and from each other.

  The 1st accelerometer 10a is installed in the foundation of a structure, and is provided with the measurement part 11a and the communication part 12a. The second accelerometer 10b is installed on an arbitrary level (hereinafter referred to as “upper floor”) of the structure on the second floor or higher, and includes a measurement unit 11b and a communication unit 12b. In the following description, any one of the first accelerometer 10a and the second accelerometer 10b is simply referred to as an accelerometer 10. Further, an arbitrary measurement unit of the measurement unit 11a and the measurement unit 11b is simply referred to as a measurement unit 11. In addition, any communication unit of the communication unit 12a and the communication unit 12b is simply referred to as a communication unit 12. The first accelerometer 10a may be installed on the first floor, but it is particularly preferable to install the first accelerometer 10a on the foundation of the structure as in this example.

  The measurement part 11a measures the acceleration of the part to which the first accelerometer 10a is attached in the structure. The measurement unit 11a is configured to perform acceleration caused by environmental vibrations including vibrations during vehicle travel on surrounding roads and vibrations generated in daily life in a structure during a predetermined period (first predetermined period). Measure. In the present embodiment, the first predetermined period is one period from the time of new construction or reconstruction until the occurrence of an event that gives horizontal force to industrialized structures such as earthquakes, typhoons, and tornadoes. In the following, the event will be described as an example of an earthquake.

  In addition, the measurement unit 11b measures the acceleration of a portion to which the second accelerometer 10b due to environmental vibration is attached in a period after the first predetermined period (second predetermined period). In the present embodiment, the second predetermined period is one period after the event ends, that is, after the shaking due to the horizontal force has subsided and the steady state is restored. The measurement part 11 is implement | achieved by the acceleration sensor, for example, and the acceleration sensor may use arbitrary systems, such as a mechanical sensor, an electrical sensor, and an optical sensor.

  The communication unit 12a transmits first acceleration information representing a time history of acceleration measured by the measurement unit 11a of the first accelerometer 10a and a hierarchy in which the first accelerometer 10a is installed via a communication network. It transmits to the damage degree determination apparatus 20. Similarly, the communication unit 12b communicates the second acceleration information indicating the time history of acceleration measured by the measurement unit 11b of the second accelerometer 10b and the hierarchy in which the second accelerometer 10b is installed. It transmits to the damage degree determination apparatus 20 via a network. In the following description, arbitrary information among the first acceleration information and the second acceleration information is simply referred to as acceleration information.

  In addition, the communication unit 12a and the communication unit 12b transmit structure identification information that uniquely identifies the structure in association with the acceleration information.

  The damage degree determination device 20 determines the damage degree of the structure. The damage degree determination device 20 includes a communication unit 21, a natural frequency calculation unit 22, a change rate calculation unit 23, a structure information storage unit 24, a member characteristic storage unit 25, a structure characteristic storage unit 26, and a determination unit 27. .

  The communication unit 21 receives the first acceleration information transmitted by the first accelerometer 10a. The communication unit 21 receives the second acceleration information transmitted by the second accelerometer 10b. Moreover, the communication part 21 receives the structure identification information respectively linked | related with 1st acceleration information and 2nd acceleration information.

  In addition, the communication unit 21 transmits the damage degree determined by the determination unit 27 and the structure identification information of the structure related to the damage degree to the display device 30.

The natural frequency calculation unit 22 calculates the first natural frequency f ₁ of the structure based on the acceleration of the foundation and the acceleration of the upper floor before the occurrence of the earthquake. Also, the natural frequency calculation unit 22, based on the acceleration of the acceleration and upstairs foundation after the earthquake, to calculate a second natural frequency f ₂ of the structure.

  Here, the method by which the natural frequency calculation unit 22 calculates the natural frequency f will be described in detail.

  The natural frequency calculator 22 calculates the Fourier spectrum of the basic acceleration by performing a fast Fourier transform on the time history of the basic acceleration represented by the first acceleration information received by the communication unit 21. Similarly, the natural frequency calculation unit 22 performs a fast Fourier transform on the time history of the upper floor acceleration represented by the second acceleration information received by the communication unit 21, and calculates the Fourier spectrum of the upper floor acceleration.

  The natural frequency calculator 22 calculates a transfer function based on the Fourier spectrum of the basic acceleration and the Fourier spectrum of the acceleration on the upper floor. Further, the natural frequency calculation unit 22 calculates the frequency at which the amplitude is peak in the calculated transfer function as the natural frequency f.

  As shown in Equation 1, the natural frequency f of the structure depends on the rigidity k and mass m of the structure. Specifically, when the mass m of the structure is constant, the natural frequency f is higher as the stiffness k is larger. In addition, the rigidity k of the structure contributes to the soundness regarding the earthquake resistance of the structure, and specifically, the rigidity k tends to decrease as damage progresses.

  Further, FIG. 2 shows a change in the natural frequency f obtained by the inventors conducting an experiment in which vibration is applied (vibrated) to a predetermined structure. In this experiment, vibrations simulating vibrations caused by relatively large-scale earthquakes that occurred in the past were applied to the structure in the order of their impact on the specimen, and weak vibrations were applied before and after that. It was. FIG. 2 shows the change in frequency at the time of slight vibration. FIG. 2 shows changes in the natural frequency f in the X direction and Y direction of the specimen of the structure. In either case, the natural frequency of the structure increases as the number of vibrations increases. f decreases. In particular, the reduction rate of the natural frequency f is high from the second vibration to the fifth vibration, and the reduction rate of the natural frequency f from the fifth vibration to the seventh vibration is high. Slightly lower, and the reduction rate of the natural frequency f after the seventh is very small. Moreover, in the excitation experiment simulating the earthquake motion between the 2nd and 3rd times, the natural frequency f is greatly reduced, because non-structural elements such as the interior walls constituting the structure are damaged. It is estimated that the rigidity k of the structure has decreased.

The rate-of-change calculating unit 23 calculates the first natural frequency f ₁ calculated by the natural frequency calculating unit 22 based on the basic acceleration and the upper floor acceleration in the first predetermined period, and the second predetermined frequency. the ratio of the difference between the second and the natural frequency f ₂ which is calculated based on the acceleration of the acceleration and upstairs foundation in the period, to the first natural frequency _{f 1 (f 2 -f 1)} / f 1 Is calculated as the natural frequency change rate.

In addition, when the damage degree determination apparatus 20 in this embodiment is installed in an existing industrialized structure, the natural frequency calculation unit 22 is measured by the accelerometer 10 at the time of installation or after installation. The first natural frequency f ₁ , which is the natural frequency at the time of new construction, is obtained from the natural frequency calculated based on the acceleration and the structure characteristic model according to some design elements to be set at the time of design. It may be estimated. In this case, the change rate calculation unit 23 calculates the natural frequency change rate based on the estimated first natural frequency f ₁ and the second natural frequency f ₂ after the end of the earthquake.

  The structure information storage unit 24 stores a part of design elements constituting the structure in association with the structure identification information for uniquely identifying the structure. The structure information storage unit 24 may store owner information, an address, and the like in association with the structure identification information.

  The member characteristic storage unit 25 stores a member characteristic model indicating the relationship between the horizontal force and the deformation amount as shown in FIG. 3 for each type of member. The member characteristic model shown in FIG. 3 indicates that the gradient of the horizontal force with respect to the deformation amount decreases each time vibration is applied, that is, the rigidity k of the member decreases each time vibration is applied.

  The structure characteristic storage unit 26 stores a structure characteristic model generated according to some design elements of the structure such as the arrangement of members as shown in FIG. The structure property model is a model that represents the relationship between the horizontal force and the deformation amount for the entire structure, generated according to some design elements including the members related to the member property model. In the structure characteristic model of FIG. 4, the amount of deformation increases each time a horizontal force is applied by vibration, and the gradient of the horizontal force with respect to the amount of deformation decreases, that is, the rigidity k of the structure is increased. It shows that it becomes low. As the structure characteristic model, a member that has the greatest influence on the damage of the entire building among members constituting the structure, for example, a member characteristic model of an end portion of a beam may be used.

  In the industrialized structure, since the design elements are standardized as described above, the number of design elements to be set at the time of design is small compared to all the design elements. Therefore, the structure characteristic model of the industrialized structure can be easily generated by setting some design elements. In addition, it is also possible to make a structure characteristic model common to a plurality of industrialized structures in which some of some design elements to be set are common. Therefore, the number of structural property models for all industrialized structures is less than the number of structural property models when all design elements need to be set, and the structure for which the degree of damage is to be judged is the industrialized structure. By using the structure, the structure characteristic storage unit 26 can easily store the structure characteristic model.

Further, the structure characteristic storage unit 26 stores the natural frequency change rate (f ₂ −f ₁ ) / f ₁ , the deformation amount, and the deformation amount and the degree of damage according to some design elements of the structure. To do. Here, based on the results of experiments and simulations of structural members and non-structural members performed in advance, for example, by parametric study, the natural frequency change rate (f ₂ −f common to some design elements of the structure is obtained. By finding the relationship between ₁ ) / f ₁ and the amount of deformation, and the amount of deformation and the degree of damage, the natural frequency change rate and the degree of damage are related. When the fatigue phenomenon of the structure is remarkable, since it is necessary to consider the number of repetitions in addition to the deformation amount, the natural frequency change rate and the degree of damage may be directly associated with each other.

  In the present embodiment, the structure property storage unit 26 stores a higher degree of damage in association with the amount of deformation. For example, the degree of damage “less damage” is stored in association with the deformation amount less than the first threshold, and “being careful because there is damage” in association with the deformation amount greater than or equal to the first threshold and less than the second threshold. The degree of damage may be stored, and the degree of damage that “the damage is large and there is a possibility of collapse” may be stored in association with the deformation amount equal to or greater than the second threshold.

The determination unit 27 determines the degree of damage to the structure based on the natural frequency change rate and some design elements of the structure. Specifically, the determination unit 27 extracts some design elements stored in the structure information storage unit 24 in association with the structure identification information transmitted from the accelerometer 10 together with the acceleration information. Then, the determination unit 27 is based on the structure characteristic model stored in the structure characteristic storage unit 26 in association with some design elements, and the natural frequency change rate calculated by the natural frequency calculation unit 22 ( The deformation amount of the structure corresponding to f ₂ −f ₁ ) / f ₁ is determined. And the determination part 27 determines the damage degree of a structure by extracting the damage degree which the structure characteristic memory | storage part 26 memorize | stored in relation to the deformation amount of a structure.

  The display device 30 includes a communication unit 31 and a display unit 32.

  The communication unit 31 receives the damage degree and structure identification information transmitted from the communication unit 21 of the damage degree determination device 20.

  The display unit 32 displays the damage degree and structure identification information received by the communication unit 31.

  The server 40 includes a communication unit 41 and a control unit 42.

  The communication unit 41 receives the damage degree and structure identification information related to one or more structures transmitted from the communication unit 21 of the damage degree determination device 20.

  The control unit 42 performs various statistical processes and the like based on the degree of damage and the structure identification information related to the plurality of structures received by the communication unit 41. For example, the control unit 42 creates a damage degree map using the damage degree and the addresses respectively associated with the structure identification information about the plurality of structures.

  As described above, according to the first embodiment, the damage degree determination apparatus 20 is configured separately from design elements that are common to member characteristic models of members specified by experiments, simulations, etc. The structure characteristic model of the entire structure that can be generated by combining a part of the design elements set in is stored. Therefore, the damage determination device 20 uses the natural frequency change rate of the structure and a structure characteristic model corresponding to some design elements of the structure stored in the structure characteristic storage unit 26 in advance. It is possible to quickly determine the degree of damage.

  Moreover, according to 1st Embodiment, since the structure used as the object for which the damage degree determination system 1 determines safety | security is an industrialized structure, the score and kind of a member are limited. Therefore, there are fewer design elements to be set in the industrialized structure than all design elements. Therefore, there are few types of structure characteristic models to be generated. Therefore, it is easy for the structure characteristic storage unit 26 to store a small number of structure characteristic models with different design elements, and the above-described effects can be achieved.

  In addition, according to the first embodiment, the damage degree determination device 20 includes the acceleration measured by the first accelerometer 10a installed on the foundation of the structure, and the second installed on the upper floor of the structure. The degree of damage is determined using the natural frequency f calculated based on the acceleration measured by the accelerometer 10b. Therefore, the degree of damage can be determined based on the shaking of the structure, not the shaking of the ground. Therefore, it is possible to accurately and accurately determine the degree of damage compared to the case where the degree of damage is estimated by structural calculation based on ground shaking without measuring physical quantities relating to actual building damage.

Further, according to the first embodiment, the natural frequency change rate based on the natural frequency f ₁ based on the acceleration measured before the occurrence of the earthquake and the natural frequency f ₂ based on the acceleration measured after the end of the earthquake. To determine the degree of damage to the structure. Therefore, even if the accelerometer 10 becomes unable to operate due to a power failure due to the occurrence of an earthquake, the accelerometer 10 can measure the acceleration before the earthquake and after recovering from the power failure after the earthquake, Thereby, the damage degree determination apparatus 20 can determine the damage degree. Moreover, even if the accelerometer 10 is damaged during the occurrence of the earthquake, it can be measured by installing an accelerometer separately after the earthquake. Moreover, the damage degree determination apparatus 20 does not need to measure the acceleration during the occurrence of the earthquake, and therefore needs to include a battery that supplies power to the accelerometer 10 when a power failure occurs during the occurrence of the earthquake. Thus, the cost associated with the battery can be reduced. Further, since the damage degree determination device 20 does not use the accelerometer 10 during the occurrence of the earthquake in determining the damage degree, it is not necessary to have a memory for storing the acceleration during the occurrence of the earthquake, and installation and maintenance of the battery It is possible to save costs and labor related to. When an earthquake does not occur, it is not necessary to periodically measure acceleration, and the processing load on the CPU and the power supplied to operate the CPU can be saved.

Further, according to the first embodiment, the damage degree determination apparatus 20, the first natural frequency f ₁ during new construction or renovation of industrialized structure, the second natural frequency after the earthquake completion f ₂ The degree of damage is determined based on the natural frequency change rate calculated based on the above. Therefore, the damage degree determination apparatus 20 can determine the damage degree in consideration of the aging after the structure is newly constructed or reconstructed and the structural change due to the past earthquake. The damage degree determination device 20 does not need to include a memory for holding the earthquake history as in the case of determining the damage degree by performing a response calculation on all the past earthquake histories, and reduces the amount of memory. Is possible.

  Moreover, according to 1st Embodiment, the damage degree determination apparatus 20 is connected to the server 40 via communication networks, such as the internet and an intranet. For this reason, the server 40 can receive the damage degree of a plurality of structures, the address of the structure, and the like from the damage degree determination device 20, and for example, it is easy to make a damage degree map after an earthquake by using such information. Can be created. Therefore, it is possible to grasp the distribution of earthquake damage and to plan and implement recovery support activities in the affected areas smoothly and effectively.

  According to the first embodiment, the natural frequency calculation unit 22 calculates the natural frequency f by calculating the Fourier spectrum from the accelerations measured by the accelerometers 10 on the foundation and the upper floor. Not limited to. For example, the natural frequency calculation unit 22 may calculate the maximum displacement of each layer by second-order integration of accelerations respectively measured by the foundation and the upper floor accelerometer 10 at the time of the earthquake. In this case, the natural frequency calculation unit 22 can calculate the natural frequency f by calculating the interlayer deformation angle based on the calculated displacement difference between the foundation and the upper floor.

In the first embodiment, the rate of change calculation unit 23 calculates a ratio f ₂ / f ₁ between the natural frequency f ₁ based on the acceleration measured before the earthquake and the natural frequency f ₂ based on the acceleration measured after the earthquake. The natural frequency change rate may be calculated. In this case, the determination unit 27 determines the degree of damage of the structure based on the ratio f ₂ / f ₁ and the structure characteristic model.

  In the first embodiment, the damage degree determination device 20 and the display device 30 are configured as separate devices. However, the damage degree determination device 20 and the display device 30 may be configured as a single unit. Moreover, either of the accelerometers 10a and 10b and the damage degree determination device 20 may be configured as a single unit.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to the drawings.

  Similar to the damage degree determination system 1 according to the first embodiment, the damage degree determination system 2 according to the second embodiment includes a first accelerometer 10a, a second accelerometer 10b, a damage degree determination device 20, , A display device 30 and a server 40.

  The measurement unit 11 of the accelerometer 10 according to the second embodiment is different from the measurement unit 11 according to the first embodiment in that the acceleration from the occurrence of the earthquake to the end of the earthquake is measured.

The natural frequency calculation unit 22 is based on the acceleration time history in a predetermined period (first predetermined period) in each of the foundation and the upper floor included in the first acceleration information and the second acceleration information. To calculate the _first natural frequency f1. In the present embodiment, the first predetermined period is one period during the occurrence of the earthquake, for example, 5 seconds from the time of the occurrence of the earthquake.

In addition, the natural frequency calculation unit 22 calculates the second natural frequency f ₂ based on the time history of acceleration in a predetermined period (second predetermined period) in each of the foundation and the upper floor. A specific method for calculating the natural frequency f based on the acceleration time history is the same as in the first embodiment. In the present embodiment, the second predetermined period is a period after the first predetermined period during the occurrence of the earthquake, for example, a free vibration period after strong vibration in which the structure elastically responds.

Change rate calculating section 23, the difference between the first natural frequency _{f 1} and the second natural frequency _{f 2,} the first ratio natural frequency _{f 1} of _{(f 2} -f 1) / _{f 1} Calculated as the natural frequency change rate.

The determination unit 27 extracts some design elements to be set, which are stored in the structure information storage unit 24 in association with the structure identification information included in the acceleration information transmitted from the accelerometer 10. The determination unit 27 then calculates the natural vibration calculated by the natural frequency calculation unit 22 based on the structure characteristic model stored in the structure characteristic storage unit 26 according to some design elements to be set. The deformation amount of the structure corresponding to the number change rate (f ₂ −f ₁ ) / f ₁ is determined. And the determination part 27 determines the damage degree of a structure by extracting the damage degree which the structure characteristic memory | storage part 26 memorize | stored in relation to the deformation amount of a structure.

  Since other configurations and operations in the second embodiment are the same as those in the first embodiment, the same or corresponding components are denoted by the same reference numerals and description thereof is omitted.

As described above, according to the second embodiment, the structure characteristic storage unit 26 stores a structure characteristic model generated according to some design elements of the structure. The determination unit 27 then changes the natural frequency of the structure based on the first natural frequency f ₁ in the first predetermined period and the second natural frequency f ₂ in the second predetermined period. And the degree of damage is determined based on some design elements of the structure. For this reason, the first embodiment is capable of determining the degree of damage with higher accuracy and accuracy than the case of estimating the degree of damage using only the earthquake information of the ground without measuring physical quantities relating to actual building damage. The same effect is produced. Further, as in the first embodiment, the degree of damage can be determined quickly and easily.

In the second embodiment, the rate of change calculation unit 23 uses the first natural frequency f ₁ based on the time history of acceleration at the first predetermined time during the earthquake and the second predetermined frequency during the same earthquake. A ratio f ₂ / f ₁ with the second natural frequency f ₂ based on the time history of acceleration in time may be calculated as the natural frequency change rate. In this case, the determination unit 27 determines the degree of damage of the structure based on the ratio f ₂ / f ₁ and the structure characteristic model.

  Although the above embodiment has been described as a representative example, it will be apparent to those skilled in the art that many changes and substitutions can be made within the spirit and scope of the invention. Therefore, the present invention should not be construed as being limited by the above-described embodiments and examples, and various modifications and changes can be made without departing from the scope of the claims. For example, a plurality of constituent blocks described in the embodiments can be combined into one, or one constituent block can be divided.

1, 2 Damage degree determination system 10 Accelerometer 10a First accelerometer 10b Second accelerometer 11 Measurement unit 11a First measurement unit 11b Second measurement unit 12 Communication unit 12a First communication unit 12b Second Communication unit 20 Damage degree determination device 21 Communication unit 22 Natural frequency calculation unit 23 Change rate calculation unit 24 Structure information storage unit 25 Member characteristic storage unit 26 Structure characteristic storage unit 27 Determination unit 30 Display device 31 Communication unit 32 Display unit 40 server 41 communication unit 42 control unit

Claims (9)

For an industrialized structure that can be designed by setting some design elements, a first natural frequency for a first predetermined period is calculated, and a second predetermined frequency after the first predetermined period is calculated. A natural frequency calculator for calculating the second natural frequency of the period;
A rate of change calculation unit for calculating a rate of change of the natural frequency based on the first natural frequency and the second natural frequency;
A determination unit that determines the degree of damage of the industrialized structure based on the natural frequency change rate and the part of the design elements;
A damage degree determination apparatus comprising:   The natural frequency calculation unit calculates a first natural frequency based on an acceleration of a base or first floor of a first predetermined period and an acceleration of an upper floor which is an arbitrary hierarchy of two or more floors, 2. The damage degree determination device according to claim 1, wherein the second natural frequency is calculated based on the acceleration of the base or the first floor and the acceleration of the upper floor during a second predetermined period.   The first predetermined period is a period from the time of new construction or reconstruction to the time before the occurrence of an event that gives horizontal force to the industrialized structure, and the second predetermined period is after the event has ended. The damage degree determination apparatus according to claim 1, wherein the damage degree determination apparatus is a period of the above.   The first predetermined period is a period during which an event for applying a horizontal force to the industrialized structure is occurring, and the second predetermined period is a period during which the event is occurring. The damage degree determination apparatus according to claim 1, wherein the damage degree determination apparatus is one period after the first predetermined period.   The said determination part determines the damage degree of the said industrialized structure based on the structure characteristic model produced | generated by setting the said one part design element, The one of Claims 1 thru | or 4 characterized by the above-mentioned. The damage degree determination apparatus according to one item.   The determination unit determines a deformation amount of the industrialized structure based on the structure characteristic model using the natural frequency change rate, and extracts the degree of damage stored in association with the deformation amount. The damage degree determination apparatus according to claim 5, wherein the damage degree of the industrialized structure is determined. A first accelerometer that measures the acceleration of the foundation or first floor of an industrialized structure that can be designed by setting some design elements;
A second accelerometer that measures the acceleration of the upper floor, which is an arbitrary floor above the second floor of the industrialized structure;
A damage degree determination device for determining the damage degree of the industrialized structure,
The damage degree judging device is
Calculating a first natural frequency of the industrialized structure based on an acceleration measured by the first accelerometer and an acceleration measured by the second accelerometer during a first predetermined period; and The industrialized structure based on the acceleration measured by the first accelerometer and the acceleration measured by the second accelerometer in a second predetermined period after the first predetermined period. A natural frequency calculation unit for calculating a second natural frequency;
A rate of change calculation unit for calculating a rate of change of the natural frequency based on the first natural frequency and the second natural frequency;
A determination unit that determines the degree of damage of the industrialized structure based on the natural frequency change rate and the part of the design elements;
A damage degree determination system comprising: A display device for displaying the degree of damage determined by the degree-of-damage determination device;
A part or all of the first and second accelerometers, the damage degree determination device, and the display device are connected to each other via the wired or wireless Internet to transmit / receive information. The damage degree determination system according to claim 7.   The damage degree determination system according to claim 7 or 8, further comprising a server that receives information on the degree of damage related to one or more industrialized structures from the damage degree determination device via a network.

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