JP7283661B2 - Foundation damage estimation device and foundation damage estimation program - Google Patents

Description

The present invention relates to a foundation damage estimation device and a foundation damage estimation program.

Various methods have been proposed for detecting damage to the foundation of a building. For example, in Patent Documents 1 and 2, an optical fiber is embedded in advance in a ready-made pile that constitutes the foundation of a building, and when the ready-made pile is damaged, the optical fiber breaks. A soundness evaluation method for a building (pile) for estimating the presence or absence of damage to the building (pile) is disclosed.

JP-A-2002-4272 JP-A-2003-213676

However, in the building (pile) soundness evaluation methods disclosed in Patent Document 1 and Patent Document 2, it is necessary to embed optical fibers in prefabricated piles in advance at the time of building construction. It was difficult to install the new optical fiber. In addition, it was difficult to replace the optical fiber when the optical fiber embedded in the prefabricated pile malfunctioned.

In view of the above facts, the present invention provides a foundation damage estimation device and a foundation damage estimation program that can estimate the presence or absence of damage to the foundation due to an earthquake using a foundation sensor installed on the upper part of the foundation. for the purpose.

The foundation damage estimating apparatus according to claim 1 estimates a normal building vibration mode using building vibration data normally obtained from a building sensor provided on each floor of a building to be estimated, and A building vibration estimator that estimates the building vibration mode immediately after an earthquake using building vibration data obtained by the building sensor immediately after an earthquake, Using the foundation vibration data collected, the normal foundation vibration mode is estimated, and using the foundation vibration data obtained immediately after the earthquake by the foundation sensor, the foundation vibration mode immediately after the earthquake is estimated. and a foundation vibration estimating unit that normalizes the foundation vibration mode immediately after the earthquake using the normal building vibration mode, and a mode of the normalized foundation vibration mode immediately after the earthquake and the normal foundation vibration mode. a damage estimation unit that estimates that the foundation of the building has been damaged by the earthquake when the vector difference is equal to or greater than a predetermined difference.

According to the above configuration, the normal building vibration mode and the post-earthquake building vibration mode are estimated using the building vibration data obtained by the building sensors provided on each floor of the building. Also, using the foundation vibration data obtained by the foundation sensor installed on the upper part of the foundation of the building, the normal foundation vibration mode and the immediately after-earthquake foundation vibration mode are estimated respectively.

By standardizing the post-earthquake foundation vibration mode using the normal building vibration mode, the post-earthquake foundation is less likely to be affected by changes in the vibration mode of the entire building (building vibration mode and foundation vibration mode) due to an earthquake. Vibration modes can be determined. By estimating that the foundation has been damaged when the difference between the normalized mode vectors of the foundation vibration mode immediately after the earthquake and the normal foundation vibration mode is equal to or greater than a predetermined difference, the damage to the foundation due to the earthquake is estimated. It is possible to estimate the presence or absence of

The foundation damage estimating device according to claim 2 is the foundation damage estimating device according to claim 1, wherein the foundation vibration estimating unit includes a plurality of vibration estimating units arranged at a plurality of locations on the upper part of the foundation. Using the foundation vibration data obtained by the foundation sensor of, the normal foundation vibration mode and the post-earthquake foundation vibration mode at a plurality of locations are respectively estimated, and the damage estimation unit estimates the normal foundation vibration mode The building vibration mode is used to standardize the foundation vibration modes immediately after the earthquake at a plurality of locations, and the difference between the mode vectors of the normalized foundation vibration mode immediately after the earthquake and the normal foundation vibration mode is the predetermined difference. It is presumed that the foundations at the above points were damaged by the earthquake.

According to the above configuration, a plurality of foundation sensors installed on the upper part of the foundation are used to estimate the normal foundation vibration mode and the post-earthquake foundation vibration mode at multiple locations. Then, by estimating that the foundation has been damaged at locations where the difference in the mode vector between the normalized foundation vibration mode immediately after the earthquake and the normal foundation vibration mode is equal to or greater than a predetermined difference, the foundation is damaged by the earthquake. It is possible to estimate the location of the damage.

The foundation damage estimating device according to claim 3 is the foundation damage estimating device according to claim 1 or 2, wherein the building vibration estimating unit measures the position of the center of rigidity and the center of gravity of the building on each floor of the building. The normal building vibration mode and the post-earthquake building vibration mode are estimated using the building vibration data obtained by the building sensors arranged at least one of the positions.

According to the above configuration, by arranging the building sensor at at least one of the center-of-rigidity position and the center-of-gravity position of the building, it is possible to efficiently estimate the vibration mode of the building with a small number of building sensors.

The foundation damage estimation program according to claim 4 estimates a normal building vibration mode using building vibration data normally obtained from a building sensor provided on each floor of a building to be estimated, and Using the building vibration data obtained immediately after the earthquake by the building sensor, the building vibration mode immediately after the earthquake is estimated, and the foundation vibration obtained in normal times by the foundation sensor installed on the foundation of the building using the data to estimate the normal vibration mode of the foundation; When the foundation vibration mode immediately after the earthquake is normalized using the building vibration mode, and the difference in the mode vector between the normalized foundation vibration mode immediately after the earthquake and the normal foundation vibration mode is equal to or greater than a predetermined difference. A computer is caused to execute processing for estimating that the foundation of the building has been damaged by the earthquake.

According to the above configuration, the normal building vibration mode and the post-earthquake building vibration mode are estimated using the building vibration data obtained by the building sensors provided on each floor of the building. Also, using the foundation vibration data obtained by the foundation sensor installed on the upper part of the foundation of the building, the normal foundation vibration mode and the immediately after-earthquake foundation vibration mode are estimated respectively.

By standardizing the post-earthquake foundation vibration mode using the normal building vibration mode, the post-earthquake foundation is less likely to be affected by changes in the vibration mode of the entire building (building vibration mode and foundation vibration mode) due to an earthquake. Vibration modes can be determined. By estimating that the foundation has been damaged when the difference between the normalized mode vectors of the foundation vibration mode immediately after the earthquake and the normal foundation vibration mode is equal to or greater than a predetermined difference, the damage to the foundation due to the earthquake is estimated. It is possible to estimate the presence or absence of

According to the foundation damage estimation device and the foundation damage estimation program according to the present invention, it is possible to estimate the presence or absence of damage to the foundation due to an earthquake using the foundation sensor installed on the upper part of the foundation.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram (perspective view) which shows an example of the building used as the estimation target of foundation damage of the foundation damage estimation apparatus which concerns on embodiment. It is a block diagram which shows an example of the hardware constitutions of the foundation damage estimation apparatus which concerns on embodiment. It is a block diagram showing an example of functional composition of a foundation damage estimating device concerning an embodiment. 6 is a flowchart showing an example of a procedure of foundation damage estimation processing according to the embodiment; (A) is a schematic diagram (perspective view) showing an example of a vibration mode of a building during normal times, (B) is a schematic diagram (perspective view) showing an example of a vibration mode of a building immediately after an earthquake, and (C ) is a schematic diagram (perspective view) showing an example of a standardized vibration mode of a building immediately after an earthquake.

1 to 5, a foundation damage estimation device according to an embodiment of the present invention will be described in order.

(Building configuration)
First, the configuration of the building 10 to be estimated for foundation damage by the foundation damage estimation apparatus 100 (see FIGS. 2 and 3) of the present embodiment will be described with reference to FIG.

As shown in FIG. 1 , a building 10 according to this embodiment has a foundation 12 and an upper structure 14 provided on the foundation 12 . The foundation portion 12 is buried in the ground GL, and includes a plurality of foundation piles 16 that support the superstructure 14, a foundation bottom slab (not shown), foundation beams (not shown), and the like.

The superstructure 14 has a plurality of floors (for example, one underground floor and three floors above ground in this embodiment), and the lowest floor located in the ground GL is supported by the foundation piles 16 of the foundation portion 12 . In FIG. 1, the lowest floor of the superstructure 14 located in the ground GL is indicated by a dot pattern.

A building sensor 18 is installed on each floor of the superstructure 14 . The building sensor 18 is, for example, an acceleration sensor capable of detecting responses in three degrees of freedom in the horizontal and vertical directions and six degrees of freedom in the rotational direction calculated from each response. Detect building vibration data.

The building sensor 18 is installed at at least one of the center of rigidity position and the center of gravity position on each floor of the superstructure 14 of the building 10 . In the present embodiment, the superstructure 14 is a shaped building, and the center of rigidity and the center of gravity coincide. installed one by one.

A plurality of foundation sensors 20 are installed on the foundation 12 on the lowest floor of the upper structure 14 of the building 10 . The foundation sensor 20 is composed of the same acceleration sensor as the building sensor 18, and detects foundation vibration data, which is time-series data of vibration response of the installed position.

In this embodiment, the plurality of foundation sensors 20 are arranged above the plurality of foundation piles 16 on the lowest floor of the upper structure 14, and arranged on the same plane. The foundation sensor 20 is preferably installed at a position where it vibrates integrally with the foundation pile 16 (foundation 12) when an earthquake occurs. are fixed respectively. Note that the base sensors 20 do not necessarily have to be arranged on the same plane, and may have different installation heights in the vertical direction.

(Configuration of foundation damage estimation device)
Next, the configuration of the foundation damage estimation device 100 of this embodiment will be described with reference to FIGS. 2 and 3. FIG. Examples of the foundation damage estimation device 100 include information processing devices such as personal computers and server computers.

As shown in FIG. 2, the foundation damage estimation device 100 according to the present embodiment includes a CPU (Central Processing Unit) 102, a memory 104 as a temporary storage area, a nonvolatile storage unit 106, an input unit such as a keyboard and a mouse. 108 , a display unit 110 such as a liquid crystal display, a medium read/write device (R/W) 112 , and a communication interface (I/F) unit 114 .

The CPU 102, memory 104, storage unit 106, input unit 108, display unit 110, medium read/write device 112, and communication I/F unit 114 are connected to each other via a bus B1. The medium read/write device 112 reads information written in the recording medium 116 and writes information to the recording medium 116 .

The storage unit 106 is realized by a HDD (Hard Disk Drive), SSD (Solid State Drive), flash memory, or the like. A foundation damage estimation program 106A is stored in the storage unit 106 as a storage medium.

The recording medium 116 in which the foundation damage estimation program 106A is written is set in the medium reading/writing device 112, and the medium reading/writing device 112 reads out the foundation damage estimation program 106A from the recording medium 116. Thus, it is stored in the storage unit 106 .

The CPU 102 reads the foundation damage estimation program 106A from the storage unit 106, develops it in the memory 104, and sequentially executes the processes of the foundation damage estimation program 106A.

Next, the functional configuration of the foundation damage estimation device 100 according to this embodiment will be described using FIG.

As shown in FIG. 3, the foundation damage estimation device 100 includes a vibration estimation section 102A and a damage estimation section 102D. Vibration estimator 102A includes building vibration estimator 102B and foundation vibration estimator 102C. The CPU 102 of the foundation damage estimation device 100 executes the foundation damage estimation program 106A to function as a vibration estimation unit 102A and a damage estimation unit 102D.

The building vibration estimating unit 102B uses building vibration data obtained by the building sensors 18 provided on each floor of the superstructure 14 of the building 10 shown in FIG. to estimate the normal building vibration mode. Also, the building vibration estimation unit 102B estimates the building vibration mode immediately after the earthquake using the building vibration data obtained by the building sensor 18 immediately after the occurrence of the earthquake.

In this embodiment, the normal building vibration mode estimated by the building vibration estimation unit 102B is stored (registered) in the storage unit 106 shown in FIG. 2 as a reference vibration mode (reference state). Then, the damage estimation unit 102D, which will be described later, reads from the storage unit 106 to obtain the normal building vibration mode in the reference state.

The foundation vibration estimating unit 102C uses the foundation sensor 20 provided on the upper part of the foundation 12 of the building 10 shown in FIG. is used to estimate the normal base vibration mode. The foundation vibration estimator 102C estimates the foundation vibration mode immediately after the earthquake using the foundation vibration data obtained by the foundation sensor 20 immediately after the occurrence of the earthquake.

In the present embodiment, the normal base vibration mode estimated by the base vibration estimation unit 102C is stored (registered) in the storage unit 106 shown in FIG. 2 as a reference vibration mode (reference state). Then, the damage estimation unit 102D, which will be described later, reads out from the storage unit 106 to acquire the normal base vibration mode in the reference state.

Here, the normal building vibration mode, the immediately after-earthquake building vibration mode, the normal-time foundation vibration mode, and the immediately after-earthquake foundation vibration mode are estimated using the system identification method. Examples of system identification methods include a subspace method, a method using an ARX (autoregressive extrinsic) model, and a parameter estimation method using a finite element model. Since the specific example of the system identification method described above is a well-known technique, further explanation is omitted here.

In general, the building vibration data and foundation vibration data (i.e., acceleration records) used to estimate each vibration mode described above change according to the degree of damage to the superstructure 14 and foundation 12 of the building 10 due to an earthquake. . In addition, even if the building 10 is not damaged, the acceleration record may be affected by the amplitude and phase characteristics of the earthquake (for example, pulse wave vibration, long-period wave vibration), noise (for example, vibration caused by a collision object), etc. Varies accordingly. In this embodiment, by estimating each vibration mode using a system identification method, it is possible to extract only changes in acceleration records caused by damage to the superstructure 14 and foundation 12 of the building 10 due to an earthquake. .

Further, the vibration estimator 102A simultaneously (integrally) estimates each building vibration mode by the building vibration estimator 102B and estimates each foundation vibration mode by the foundation vibration estimator 102C. Estimate the vibration mode of the whole (superstructure 14 and foundation 12). Note that the vibration mode of the entire building 10 is obtained by considering not only the horizontal direction of the upper portion of the foundation portion 12 but also the rotation component (the vertical response of the foundation portion sensor 20).

By estimating the building vibration mode and the foundation vibration mode at the same time (integrally) as the vibration mode of the entire building 10 in this manner, the building vibration mode and the foundation vibration mode are estimated separately. Therefore, it is possible to improve the estimation accuracy of the vibration mode.

The damage estimation unit 102D also estimates whether or not the foundation 12 of the building 10 has been damaged by the earthquake using each vibration mode of the building 10 estimated by the vibration estimation unit 102A. Specifically, the damage estimation unit 102D first uses the normal building vibration mode in the reference state stored in the storage unit 106 shown in FIG. become

Here, "standardization" means that the mode value at a predetermined point (for example, the highest point) of the normal building vibration mode in a predetermined vibration mode (for example, primary mode) is set as a reference value, and the building It means correcting the mode value of each point of the vibration mode of the entire building 10 immediately after the earthquake by combining the mode values of corresponding points (for example, the highest point) of the vibration mode.

Then, the damage estimator 102D compares the mode vector of each point between the normalized post-earthquake foundation vibration mode and the normal foundation vibration mode, and the difference between the mode vectors is determined by a predetermined criterion (predetermined difference ), it is assumed that the foundation 12 of the building 10 has been damaged by the earthquake. In addition, the estimation result by the damage estimation unit 102</b>D is displayed by the display unit 110 .

(Foundation Damage Estimation Processing)
Next, a procedure of foundation damage estimation processing by the foundation damage estimation device 100 according to the present embodiment will be described with reference to FIG.

For example, when the user inputs an instruction to start execution of the foundation damage estimation program 106A via the input unit 108, the CPU 102 of the foundation damage estimation device 100 executes the foundation damage estimation program 106A, The foundation damage estimation process shown in FIG. 4 is executed.

First, in step 200, the vibration estimating unit 102A, from the building sensors 18 installed on each floor of the upper structure 14 of the building 10 and the multiple foundation sensors 20 installed on the upper part of the foundation 12 of the building 10, Acquire building vibration data and foundation vibration data in normal times. The normal vibration data (building vibration data and foundation vibration data) is the average value of the vibration data (building vibration data and foundation vibration data) for a predetermined period before the earthquake, such as immediately after the building 10 is completed. used.

Next, in step 202, the building vibration estimating section 102B of the vibration estimating section 102A estimates the building vibration mode during normal times using the building vibration data obtained during normal times. The base vibration estimator 102C of the vibration estimator 102A estimates the normal base vibration mode using the base vibration data obtained in the normal state.

The vibration estimator 102A simultaneously (integrally) estimates the normal building vibration mode by the building vibration estimator 102B and estimates the normal foundation vibration mode by the foundation vibration estimator 102C. A normal vibration mode of the entire building 10 (superstructure 14 and foundation 12) is estimated.

Next, in step 204, vibration estimation unit 102A stores the normal building vibration mode and normal foundation vibration mode estimated in step 202 in storage unit 106 as reference vibration modes (reference states). Then, in step 206, the damage estimator 102D waits until an earthquake of a predetermined level (eg seismic intensity 3) or more occurs. If an earthquake of a predetermined level has occurred, step 206 makes an affirmative determination, and the process proceeds to step 208 .

In step 208, the vibration estimator 102A detects the occurrence of an earthquake from the building sensors 18 installed on each floor of the upper structure 14 of the building 10 and the plurality of foundation sensors 20 installed on the upper part of the foundation 12 of the building 10. Building vibration data and foundation vibration data immediately after are obtained.

Note that the vibration data (building vibration data and foundation vibration data) immediately after the occurrence of an earthquake is, for example, a predetermined period of time (for example, 5 minutes) during which the building 10 is free to vibrate immediately after the occurrence of the main motion of the earthquake. For example, an average value of vibration data (building vibration data and foundation vibration data) acquired every 30 seconds is used.

Next, in step 210, the building vibration estimation unit 102B of the vibration estimation unit 102A estimates the building vibration mode immediately after the earthquake using the building vibration data obtained immediately after the occurrence of the earthquake. The foundation vibration estimator 102C of the vibration estimator 102A estimates the foundation vibration mode immediately after the earthquake using the foundation vibration data obtained immediately after the earthquake.

The vibration estimation unit 102A simultaneously (integrally) estimates the building vibration mode immediately after the earthquake by the building vibration estimation unit 102B and the estimation of the foundation vibration mode immediately after the earthquake by the foundation vibration estimation unit 102C. The vibration mode of the entire building 10 (superstructure 14 and foundation 12) immediately after the earthquake is estimated.

At step 212, the damage estimator 102D obtains the amount of change in the building vibration mode before and after the earthquake, that is, the amount of change in the building vibration mode immediately after the earthquake with respect to the normal building vibration mode. Then, it is determined whether or not the amount of change in the building vibration mode immediately after the earthquake with respect to the normal building vibration mode is less than a predetermined amount of change.

In step 214, the damage estimation unit 102D sets the numerical value of the criteria (CL) used in the subsequent step (step 222) to the numerical value CL1 stored in advance in the storage unit .

On the other hand, if a negative determination is made in step 212, the process proceeds to step 216, and the damage estimation unit 102D updates the estimated post-earthquake building vibration mode and post-earthquake foundation vibration mode as the reference vibration mode (reference state). do. Then, in step 218, the damage estimation unit 102D sets the numerical value of the criteria (CL) used in the subsequent step (step 222) to the numerical value CL2 pre-stored in the storage unit 106. FIG.

Here, the criterion (CL) is the amount of change in the building vibration mode before and after the earthquake, that is, the damage rate of the superstructure 14 of the building 10 estimated from the degree of damage and the damage position of the superstructure 14. 12 (each foundation pile 16) CL function. Therefore, the values of CL1 and CL2 described above change according to the damage rate of the upper structure 14. For example, within the range of the damage rate of the upper structure 14 (0.0 to 1.0), A numerical value corresponding to the allowable degree of damage is determined in advance by an earthquake response simulation or the like.

Next, at step 220, the damage estimating unit 102D uses the normal building vibration mode in the reference state stored in the storage unit 106 in step 204 or the normal building vibration mode in the reference state updated in step 216 to predict the earthquake. The building vibration mode immediately after the earthquake and the foundation vibration mode immediately after the earthquake are standardized.

Here, a specific method for standardizing each vibration mode immediately after an earthquake will be described with reference to FIG. FIG. 5A shows an example of a normal vibration mode (primary mode) of the entire building 10 shown in FIG. 5(B) shows the vibration mode (1 Next mode) is shown.

In addition, in Fig. 5(C), the vibration mode during normal times of Fig. 5(A) is indicated by a dashed line, and the vibration mode immediately after the earthquake in Fig. 5(B) is indicated by a dashed line. The vibration mode immediately after is indicated by a solid line. For ease of explanation, FIGS. 5A to 5C show the lowest floor (basement floor) of the upper structure 14 of the building 10, the foundation pile 16, the building sensor 18, and the foundation sensor. 20 and only the axis P indicating the location of the center of rigidity and the center of gravity of the building 10 are shown.

As shown in FIGS. 5A and 5B, even if the superstructure 14 of the building 10 is not damaged, the foundation 12 supporting the superstructure 14 is damaged. , the vibration mode of the entire building 10 changes before and after the earthquake. On the other hand, when focusing on the deformation component of only the superstructure 14, the shape of the vibration mode (that is, the relative position of each point of the building sensor 18) does not easily change before and after the earthquake.

In each of the vibration modes before and after the earthquake, as shown in FIG. , and the mode value of the highest point (vertex of the building 10) of the vibration mode immediately after the earthquake is matched to this reference value. Then, the mode value of each point of the vibration mode of the entire building 10 immediately after the earthquake (the building vibration mode immediately after the earthquake and the foundation vibration mode immediately after the earthquake) is corrected. That is, as indicated by arrow M, the vibration mode immediately after the earthquake is standardized by superimposing the vibration mode immediately after the earthquake on the vibration mode during normal times with the highest point as a reference.

Next, at step 222, the damage estimator 102D estimates whether or not the foundation 12 of the building 10 is damaged by the earthquake. Specifically, for one foundation sensor 20 among the plurality of foundation sensors 20, the mode vectors of the normalized foundation vibration mode immediately after the earthquake and the normal foundation vibration mode are compared, and the mode vector It is determined whether or not the difference ΔVa (see FIG. 5C) is equal to or greater than a criterion (predetermined difference).

Note that the mode vector difference ΔVa can be obtained, for example, by subtracting the normal mode vector of the foundation vibration mode from the normalized mode vector of the foundation vibration mode (the mode vector immediately after the earthquake - the mode vector during normal times), or It is obtained by dividing the converted mode vector of the foundation vibration mode immediately after the earthquake by the mode vector of the foundation vibration mode at normal time (mode vector immediately after earthquake/mode vector at normal time).

Further, as described above, the numerical value of the criterion (CL), which is the criterion, differs depending on the damage rate of the superstructure 14 of the building 10 . That is, when the amount of change in the building vibration mode immediately after the earthquake relative to the normal building vibration mode is less than a predetermined amount of change, CL1 is used as the criterion (CL), and the amount of change in the building vibration mode immediately after the earthquake relative to the normal building vibration mode is less than a predetermined amount. If the amount of change is greater than or equal to the predetermined amount, CL2 is used as the criterion (CL).

For example, when the numerical value of the criteria (CL1 or CL2) is 0.3, the mode vector difference ΔVa is obtained for each base sensor 20, and the base sensor 20 having the mode vector difference ΔVa of 0.3 or more It is assumed that the foundation 12 at the corresponding location was damaged by the earthquake.

If the determination in step 222 is negative, the process proceeds to step 226 . On the other hand, if the determination in step 222 is affirmative, that is, if it is estimated that the foundation 12 at the corresponding location has been damaged by the earthquake, the process proceeds to step 224 . In step 224, the damage estimation unit 102D stores in the storage unit 106 the position of the base sensor 20 where the mode vector difference ΔVa is equal to or greater than the criterion (predetermined difference).

In step 226, the damage estimation unit 102D determines whether or not the damage determination in step 222 has been completed for each of the plurality of foundation sensors 20. If the determination is negative, the process returns to step 222 to Continue with 12 damage determinations. It should be noted that when repeatedly executing the processing from step 222 to step 226, the damage estimating unit 102D targets the base sensor 20, which has not been processed until then.

On the other hand, if the determination in step 226 is affirmative, the process proceeds to step 228, and the damage estimator 102D uses the position of the foundation sensor 20 stored in the storage unit 106 in step 224 to determine whether the foundation 12 has been damaged by the earthquake. It is displayed on the display unit 110 as the position where the reception is estimated.

Thereafter, in step 230, the damage estimator 102D determines whether or not the end timing has arrived. If the determination is negative, the process returns to step 206. End the process. The end timing includes, for example, the timing when a certain period of time has passed after the earthquake, the timing when the user instructs to end the foundation damage estimation processing, and the like.

(Effect)
According to the foundation damage estimation apparatus 100 according to the present embodiment, building vibration data of the superstructure 14 can be obtained from the building sensors 18 provided on each floor of the superstructure 14 of the building 10 . In addition, using this building vibration data, it is possible to estimate the normal building vibration mode and the post-earthquake building vibration mode.

Also, the foundation sensor 20 provided in the upper part of the foundation 12 of the building 10 can obtain the foundation vibration data in the upper part of the foundation 12 . In addition, using this foundation vibration data, it is possible to estimate the normal foundation vibration mode and the foundation vibration mode immediately after the earthquake.

Here, according to the present embodiment, the normal building vibration mode is used to normalize the foundation vibration mode immediately after an earthquake. By normalizing the vibration mode immediately after the earthquake in this way, it is possible to obtain the foundation vibration mode immediately after the earthquake, which is less susceptible to changes in the vibration mode of the entire building (the building vibration mode and the foundation vibration mode). In general, mode vectors may have different magnifications and positive/negative values depending on the estimation method, but normalization makes it possible to compare mode vectors.

By estimating that the foundation 12 has been damaged when the difference ΔVa between the normalized mode vectors of the foundation vibration mode immediately after the earthquake and the normal foundation vibration mode is equal to or greater than a criterion (predetermined difference), It is possible to estimate the presence or absence of damage to the base portion 12 due to

That is, since it is possible to estimate whether or not the foundation 12 is damaged by using the foundation sensor 20 installed on the top of the foundation 12, it is not necessary to bury the foundation sensor 20 in the foundation 12. In addition, since the foundation sensor 20 can be installed from the lowest floor of the upper structure 14 to the upper part of the foundation 12, the foundation sensor 20 can be installed later in the building 10 after completion. Even if the internal sensor 20 malfunctions, it can be easily replaced.

Further, according to the present embodiment, since the plurality of foundation sensors 20 are installed on the upper part of the foundation 12, by executing the damage determination for each of the plurality of foundation sensors 20, the foundation 12 caused by an earthquake can be detected. can be estimated. In particular, in the present embodiment, since the foundation sensor 20 is installed above each foundation pile 16, it is possible to estimate which foundation pile 16 has been damaged.

Further, according to the present embodiment, the building sensors 18 are arranged at the center of rigidity and the center of gravity of the upper structure 14 on each floor of the upper structure 14 of the building 10 . As a result, the vibration mode at the center of rigidity position and the center of gravity position of the building 10 can be efficiently estimated with a smaller number of building sensors 18 than in the configuration in which the building sensors 18 are arranged at positions other than the position of the center of rigidity and the center of gravity position. be able to.

Further, according to this embodiment, the building sensor 18 and the foundation sensor 20 are made of the same acceleration sensor. Therefore, compared to a configuration in which the building sensor 18 and the foundation sensor 20 are different types of sensors, it is possible to improve the estimation accuracy of the vibration mode and the damage estimation accuracy.

(Other embodiments)
Although one example of an embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and various other embodiments are possible within the scope of the present invention.

For example, in the above-described embodiment, the position of the center of rigidity and the position of the center of gravity of the superstructure 14 match, and one building sensor 18 is installed on each floor of the superstructure 14 . However, if the center of gravity of the superstructure 14 is different from the center of gravity (that is, in the case of an irregular building), it is preferable to install the building sensors 18 at both the center of gravity and the center of gravity.

In the above embodiment, the building sensors 18 are installed at the center of rigidity and the center of gravity of the superstructure 14. building sensor 18 may be installed. In this case, a plurality of building sensors 18 installed on the outer periphery of the superstructure 14 can be used to estimate the building vibration mode at the position of the center of gravity and the position of the center of rigidity.

Furthermore, in the above-described embodiment, the plurality of foundation sensors 20 are installed above the plurality of foundation piles 16 of the foundation 12, but it is not always necessary to install a plurality of foundation sensors 20. One base sensor 20 may be installed on top. Even in this case, it is possible to estimate whether or not the foundation 12 is damaged by estimating the damage to the location where the foundation sensor 20 is installed. Further, a plurality of foundation sensors 20 may be installed not only on the tops of the foundation piles 16 but also on the bottom slabs and foundation beams (not shown) of the foundation 12 .

Further, in the above embodiment, the building sensor 18 and the base sensor 20 are composed of the same acceleration sensor, but they may be composed of different sensors. Furthermore, the building sensor 18 and the foundation sensor 20 may be composed of a velocity sensor or a displacement sensor instead of an acceleration sensor as long as they follow the equation of motion.

Further, in the above embodiment, the damage determination of the foundation portion 12 is executed when an earthquake of a predetermined level or more occurs. It may be configured to execute.

Further, in the above embodiment, for example, as a hardware structure of a processing unit that executes each process of the vibration estimation unit 102A and the damage estimation unit 102D, the following various processors are used. be able to.

As described above, the various processors include a CPU, which is a general-purpose processor that executes software (programs) and functions as a processing unit, as well as FPGAs (Field-Programmable Gate Arrays), etc., which have circuit configurations after manufacturing. Programmable Logic Device (PLD), ASIC (Application Specific Integrated Circuit), etc. etc. are included.

The processing unit may be configured with one of these various processors, or a combination of two or more processors of the same type or different types (for example, a combination of multiple FPGAs or a combination of a CPU and an FPGA). may consist of Also, the processing unit may be configured with a single processor.

As an example of configuring the processing unit with one processor, first, one processor is configured by combining one or more CPUs and software, as typified by computers such as clients and servers. There is a form that functions as a processing unit. Secondly, there is a mode of using a processor that implements the functions of the entire system including the processing section with a single IC (Integrated Circuit) chip, as typified by a System On Chip (SoC). In this way, the processing unit is configured using one or more of the above various processors as a hardware structure.

Furthermore, as the hardware structure of these various processors, more specifically, an electric circuit in which circuit elements such as semiconductor elements are combined can be used.

10 Building 12 Foundation 18 Building sensor 20 Foundation sensor 100 Foundation damage estimation device 102B Building vibration estimation unit 102C Foundation vibration estimation unit 102D Damage estimation unit 106A Foundation damage estimation program ΔVa Mode vector difference

Claims (4)

Using the building vibration data normally obtained from the building sensors installed on each floor of the building to be estimated, the normal building vibration mode is estimated, and the building vibration obtained immediately after the earthquake occurs by the building sensor. a building vibration estimation unit that estimates a building vibration mode immediately after an earthquake using data;
The normal foundation vibration mode is estimated using the foundation vibration data normally obtained by the foundation sensor provided on the upper part of the foundation of the building, and is obtained by the foundation sensor immediately after the earthquake. a foundation vibration estimating unit for estimating a foundation vibration mode immediately after an earthquake using the obtained foundation vibration data;
The normal building vibration mode is used to normalize the foundation vibration mode immediately after the earthquake, and the difference between the normalized foundation vibration mode immediately after the earthquake and the normal foundation vibration mode is equal to or greater than a predetermined difference. a damage estimation unit that estimates that the foundation of the building has been damaged by the earthquake in some cases;
A foundation damage estimation device. The base vibration estimating unit uses the base vibration data obtained by the base sensors respectively arranged at a plurality of positions on the upper part of the base to determine the normal base vibration modes at a plurality of positions. and estimating the foundation vibration mode immediately after the earthquake,
The damage estimating unit normalizes the foundation vibration modes immediately after the earthquake at a plurality of locations using the normal building vibration mode, and compares the normalized foundation vibration modes immediately after the earthquake and the normal foundation vibration modes. estimating that the foundation at a location where the difference in the mode vectors of is equal to or greater than the predetermined difference has been damaged by the earthquake;
The foundation damage estimation device according to claim 1. The building vibration estimator uses the building vibration data obtained by the building sensor arranged at least one of the center of rigidity position and the center of gravity position of the building on each floor of the building to determine the normal building vibration mode and the Estimating the building vibration mode immediately after an earthquake,
The foundation damage estimation device according to claim 1 or 2. Using the building vibration data normally obtained from the building sensors installed on each floor of the building to be estimated, the normal building vibration mode is estimated, and the building vibration obtained immediately after the earthquake occurs by the building sensor. Using the data, estimate the building vibration mode immediately after the earthquake,
The normal foundation vibration mode is estimated using the foundation vibration data normally obtained by the foundation sensor provided on the upper part of the foundation of the building, and is obtained by the foundation sensor immediately after the earthquake. Using the obtained foundation vibration data, estimate the foundation vibration mode immediately after the earthquake,
The normal building vibration mode is used to normalize the foundation vibration mode immediately after the earthquake, and the difference between the normalized foundation vibration mode immediately after the earthquake and the normal foundation vibration mode is equal to or greater than a predetermined difference. presume that the foundation of the building was damaged by the earthquake in some cases;
A foundation damage estimation program for causing a computer to execute processing.

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