System and method for evaluating soundness

Abstract

To enhance the reliability of a system for evaluating the soundness of buildings.SOLUTION: A soundness evaluation system includes: a first position sensor provided in a base part of a first building; a second position sensor provided at the apex of the first building; a first GNSS sensor provided at the apex of the first building; a second GNSS sensor provided at the apex of a second building; and an analysis processing part. The analysis processing part derives a deformation amount of the first building, by using first position information detected by at least the first position sensor, and second position information detected by the second position sensor, and derives a change in distance between the apex of the first building and the apex of the second building, by using first position information detected by the first GNSS sensor, and second position information detected by the second GNSS sensor, to evaluate the soundness of the second building, on the basis of the deformation amount of the first building, and a change amount of a distance between the apex of the first building and the apex of the second building.SELECTED DRAWING: Figure 1A

Description

[Technical Field]

[0001] The present invention relates to a health assessment system and an assessment method. [Background technology]

[0002] A technology is known that uses GNSS (Global Navigation Satellite System) sensors to detect displacements at both the top and base of a building, and then uses these detection results to diagnose the residual deformation of the building. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-18034 Summary of the Invention [Problem to be solved by the invention]

[0004] According to the technology of Patent Document 1, two GNSS sensors are required for each building to be evaluated. Particularly in urban areas, when the sky is viewed from a GNSS sensor installed near the base of a building, the area of ​​the building's side becomes wider than the entire sky, while the area of ​​the sky becomes narrower. To improve the positioning accuracy of a GNSS sensor, it is desirable to be able to directly receive radio waves from more satellites. However, in urban areas surrounded by relatively tall buildings, it is difficult to place a GNSS sensor in a location where such a reception environment can be ensured. As a result, the positioning accuracy of a GNSS sensor installed near the base of a building tends to differ from that of a GNSS sensor installed at the top of the same building.

[0005] The problem to be solved by the present invention is to provide a building integrity assessment system and assessment method that can improve the reliability of the building integrity assessment system. [Means for solving the problem]

[0006] (1) A soundness assessment system according to one embodiment of the present invention comprises a first position sensor (81) provided at the base of a first building, a second position sensor (82) provided at the top of the first building, a first GNSS sensor (21) provided at the top of the first building, a second GNSS sensor (31) provided at the top of a second building, and an analysis processing unit that derives the amount of deformation of the first building using first position information detected by the first position sensor (81) and second position information detected by the second position sensor (82), and derives the change in the distance between the top of the first building and the top of the second building using the first position information detected by the first GNSS sensor (21) and the second position information detected by the second GNSS sensor (31), and the analysis processing unit is a soundness assessment system that evaluates the soundness of the second building based on at least the amount of deformation of the first building and the amount of change in the distance between the top of the first building and the top of the second building. (2) In the above-mentioned soundness assessment system, the analysis processing unit estimates that the change in the distance between the base of the first building and the base of the second building before and after an earthquake is within a negligible range, and determines that the deformation of the first building and the change in the distance between the top of the first building and the top of the second building are due to the deformation of the first building and the deformation of the second building. (3) In the above-described soundness evaluation system, the analysis processing unit synchronizes the first position information detected by the first position sensor (81), the second position information detected by the second position sensor (82), the first position information detected by the first GNSS sensor (21), and the second position information detected by the second GNSS sensor (31) at the timing when the first position information or the second position information is detected. (4) In the above-mentioned soundness assessment system, the analysis processing unit includes a third GNSS sensor (41) provided at the top of a third building, and the analysis processing unit derives the change in the distance between the top of the first building and the top of the third building using the first position information and the third position information detected by the third GNSS sensor (41), and evaluates the soundness of the third building based on the amount of deformation of the first building and the amount of change in the distance between the top of the first building and the top of the third building. (5) Another aspect of the health assessment system includes a first position sensor provided at the base of a first building; a second position sensor provided at the top of the first building, a first GNSS sensor provided at the top of the first building, a second GNSS sensor provided at the top of the second building, a third position sensor provided at the base of a fourth building, and a fourth position sensor provided at the top of the fourth building; a specific GNSS sensor provided on the top of the fourth building; and an analysis processing unit that evaluates the soundness of the second building, wherein the analysis processing unit derives a deformation amount of the first building using first position information detected by the first position sensor and second position information detected by the second position sensor, derives a change in the distance between the top of the first building and the top of the second building using the first position information detected by the first GNSS sensor and the second position information detected by the second GNSS sensor, and calculates a change in the distance between the top of the first building and the top of the second building using the third position information detected by the third position sensor and the fourth position information detected by the third position sensor. a fourth position information detected by a specific GNSS sensor, and a change in the distance between the top of the fourth building and the top of the second building, using the fourth position information detected by the specific GNSS sensor and the second position information detected by the second GNSS sensor; and an integrity assessment system for evaluating the integrity of the second building based on at least the deformation of the first building, the change in the distance between the top of the first building and the top of the second building, the deformation of the fourth building, and the change in the distance between the top of the fourth building and the top of the second building. (6) A method for assessing the soundness of a building using a building soundness assessment system according to one embodiment of the present invention, comprising the steps of: providing a first position sensor (81) at the base of a first building; providing a second position sensor (82) at the top of the first building; providing a first GNSS sensor (21) at the top of the first building; and providing a second GNSS sensor (31) at the top of a second building; deriving a deformation amount of the first building using first position information detected by the first position sensor (81) and second position information detected by the second position sensor (82); deriving a change in the distance between the top of the first building and the top of the second building using the first position information detected by the first GNSS sensor (21) and the second position information detected by the second GNSS sensor (31); and evaluating the soundness of the second building based on the deformation amount of the first building and the change in the distance between the top of the first building and the top of the second building. (7) A soundness assessment method according to another aspect, comprising: a first position sensor provided at a base of a first building; a second position sensor is provided at the top of the first building, a first GNSS sensor is provided at the top of the first building, a second GNSS sensor is provided at the top of the second building, a third position sensor is provided at the base of a fourth building, a fourth position sensor is provided at the top of the fourth building, and a specific GNSS sensor is provided at the top of the fourth building; a deformation amount of the first building is derived using first position information detected by the first position sensor and second position information detected by the second position sensor; and a distance between the top of the first building and the second building is determined using the first position information detected by the first GNSS sensor and the second position information detected by the second GNSS sensor. a soundness assessment method including the steps of: deriving a change in the distance to the top of the fourth building; deriving a deformation amount of the fourth building using third position information detected by the third position sensor and fourth position information detected by the fourth position sensor; deriving a change in the distance between the top of the fourth building and the top of the second building using fourth position information detected by the specific GNSS sensor and the second position information detected by the second GNSS sensor; and evaluating the soundness of the second building based on at least the deformation amount of the first building, the change in the distance between the top of the first building and the top of the second building, the deformation amount of the fourth building, and the change in the distance between the top of the fourth building and the top of the second building. [Effects of the Invention]

[0007] According to the present invention, the reliability of a building soundness evaluation system can be improved. [Brief explanation of the drawings]

[0008] [Figure 1A] 1 is a diagram for explaining a soundness evaluation system 1 according to an embodiment. [Figure 1B] 1 is a configuration diagram of a soundness evaluation system 1 according to an embodiment. [Figure 2A] 10A and 10B are diagrams for explaining detection results by GNSS according to an embodiment. [Figure 2B] 10A and 10B are diagrams for explaining detection results by GNSS according to an embodiment. [Figure 3] 1 is a diagram for explaining deformation of a building due to an earthquake and the positional relationship between two buildings according to an embodiment. FIG. [Figure 4A] 1 is a diagram for explaining a soundness evaluation system 1A according to an embodiment. [Figure 4B] 1 is a configuration diagram of a soundness evaluation system 1A according to an embodiment. [Figure 5] 1 is a diagram for explaining deformation of buildings due to an earthquake and the positional relationship between three buildings according to an embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A design support apparatus, a design support method, an evaluation system, and an evaluation method according to embodiments of the present invention will now be described with reference to the accompanying drawings.

[0010] Fig. 1A is a diagram for explaining a soundness assessment system 1 according to an embodiment. Fig. 1B is a configuration diagram of the soundness assessment system 1 according to an embodiment.

[0011] The building health assessment system 1 assesses the health of a building to be assessed using the detection results of a GNSS sensor. The buildings to be assessed are referred to as Building A, Building B, Building C, etc. Building A is an example of a first building, Building B is an example of a second building, and Building C is an example of a third building.

[0012] (Measurement system in building A) A GNSS sensor 21 and an acceleration sensor 81 are disposed on the roof of building A, and an acceleration sensor 82 is disposed at the base of building A. The GNSS sensor 21 performs positioning using the Global Navigation Satellite System (GNSS). For example, the GNSS sensor 21 may use a satellite positioning system such as the US GPS, Japan's Quasi-Zenith Satellite System (QZSS), Russia's GLONASS, or the European Union's Galileo. Each GNSS sensor described below is similar to the GNSS sensor 21. (Measurement system in building B) A GNSS sensor 31 is placed on the roof of building B. The GNSS sensor 31 performs positioning using GNSS. (Measurement system in building C) A GNSS sensor 41 is placed on the roof of building C. The GNSS sensor 41 performs positioning using GNSS.

[0013] The GNSS sensors 21, 31, and 41 may each have a wireless communication function and may be capable of communication using a terrestrial wireless communication network that accommodates mobile phones, a wireless LAN, etc. The type of communication line is not limited to this, and each may be capable of communication using wired communication.

[0014] Acceleration sensor 81 and acceleration sensor 82 may each have a wireless communication function and may be capable of communication using a terrestrial wireless communication network that accommodates mobile phones, a wireless LAN, etc. The type of communication line is not limited to this, and each may be capable of communication using wired communication.

[0015] (Soundness evaluation system) The soundness assessment system 1 includes an acquisition unit 11, an analysis processing unit 12, and an output unit 13. The acquisition unit 11 acquires the detection results of the GNSS sensors 21, 31, and 41. The acquisition unit 11 includes interfaces capable of communicating with each of the GNSS sensors 21, 31, and 41. The type of this interface can be selected as appropriate. Acquisition unit 11 further acquires the detection results of acceleration sensor 81 and acceleration sensor 82. Acquisition unit 11 includes an interface capable of communicating with either or both of acceleration sensor 81 and acceleration sensor 82. The type of this interface can be selected as appropriate. When only acceleration sensor 81 or acceleration sensor 82 is accommodated, the accommodated acceleration sensor may relay the detection result of the other acceleration sensor.

[0016] The analysis processing unit 12 evaluates, for example, the soundness of each of buildings A and B using the detection results of the GNSS sensors 21 and 31 and the detection results of the acceleration sensors 81 and 82. The analysis processing unit 12 evaluates, for example, the soundness of each of buildings A and C using the detection results of the GNSS sensors 21 and 41 and the detection results of the acceleration sensors 81 and 82. The evaluation will be described in detail later.

[0017] The output unit 13 outputs the evaluation results obtained by the analysis processing unit 12 .

[0018] The soundness assessment system 1 uses such a measurement system and assessment system to detect deformation of buildings A, B, and C caused by an earthquake.

[0019] Deformation of buildings due to an earthquake and the positional relationship between two buildings will be described with reference to FIGS. 2A, 2B, and 3 according to an embodiment. FIG. 2A is a diagram illustrating acceleration / displacement detection results based on seismic motion and time axis correction of GNSS positioning results. FIG. 2B is a diagram illustrating the distance from the top of building A to the top of building B. FIG. 3 is a diagram illustrating deformation of buildings due to an earthquake and the positional relationship between two buildings according to an embodiment. FIGS. 3(a) and 3(b) show elevations of buildings A and B, with modeled arrows indicating their inclination. The left arrow represents building A, and the right arrow represents building B. FIG. 3(a) shows the normal state, and FIG. 3(b) shows the state affected by the earthquake. In FIG. 3(b), the tilted arrow (building) indicates a state in which the building is tilted due to shaking of the ground. In the state shown in this figure, building B is tilted more than building A.

[0020] (Definition of symbols and variables in the figure) The following variables are used to analyze the deformation of Building A: AT: Displacement of the top of building A (position information in a three-dimensional coordinate system. The same applies below.) ATg: GNSS measured displacement at the top of building A...Time history data for GNSS measurement period T1 ATg_est: GNSS estimated displacement of the top of building A ATg_ave: Building A top GNSS average position (moving average: MA) ATg_Δ: Relative displacement from the reference position of the top of building A HA: Height of building A (equivalent to the height from the ground of building A to GNSS sensor 21) ATi: Integrated equivalent displacement at the top of building A (double integral of acceleration) ...Integration result of time history data at acceleration sampling period T2 (zero-order interpolation) ATi_ave: Building A top integral converted average position (moving average: MA) ATi_Δ: Relative displacement from the average integrated position of the top of building A AB: Displacement of base of building A ABi: Building A base integral equivalent displacement (double integral of acceleration) ...Integration result of time history data at acceleration sampling period T2 (zero-order interpolation)

[0021] "Building A top displacement AT" indicates the actual displacement of the top of building A. "Building A top displacement AT" may be position information or its vector in a three-dimensional coordinate system. The same applies below. "GNSS measured displacement ATg of the top of building A" indicates the displacement detected by the GNSS sensor 21 installed at the top of building A. "GNSS measured displacement ATg of the top of building A" corresponds to the time history data of the GNSS measurement period T1. "GNSS estimated displacement ATg_est of the top of building A" indicates a displacement estimated using data of the displacement detected by the GNSS sensor 21 provided at the top of building A. "Building A top GNSS average position ATg_ave" indicates the position obtained by taking the moving average of the time history data "Building A top GNSS measured displacement ATg." The width of the time window for the moving average is predetermined so that unnecessary fluctuation components can be attenuated. The "relative displacement ATg_Δ from the reference position of the top of building A" is the difference between the "GNSS measured displacement ATg of the top of building A" and the "GNSS average position ATg_ave of the top of building A." It indicates the fluctuation of the top of building A due to vibration. The "height HA of building A" corresponds to the height from the ground near building A to the GNSS sensor 21. "Building A top integrated converted displacement ATi" indicates the displacement obtained by integrating twice the acceleration detected by the acceleration sensor 81. The detected value of the acceleration sensor 81 is sampled at a sampling period T2, integrated, and used as time history data. Therefore, "Building A top integrated converted displacement ATi" also becomes time history data for the sampling period T2. Note that it is advisable to perform zero-order interpolation during each period of the sampling period T2. "Building A top integrated converted average position ATi_ave" indicates the reference position indicated by the displacement calculated from the detection results of the acceleration sensor 81. If the building is not tilted abnormally, it can be assumed that no distortion occurs in the building. The position indicated by "Building A top integrated converted average position ATi_ave" corresponds to the position of the acceleration sensor 81 when the building is not tilted abnormally and no distortion occurs in the building. The "relative displacement amount ATi_Δ with respect to the integrated converted average position of the top of building A" indicates a vibration component based on the "integrated converted average position ATi_ave of the top of building A." "Building A base displacement AB" indicates the actual displacement of the base of Building A. "Building A base integral converted displacement ABi" indicates the displacement obtained by integrating twice the acceleration detected by the acceleration sensor 82. The detected value of the acceleration sensor 82 is sampled at the sampling period T2, integrated, and used as time history data. Therefore, "Building A base integral converted displacement ABi" is also time history data for the sampling period T2. Note that it is advisable to perform zero-order interpolation during each period of the sampling period T2.

[0022] The following variables are used to analyze the deformation of Building B. The case of Building B is the same as that of Building A.

[0023] BT: Building B top displacement BTg: GNSS measured displacement at the top of building B...Time history data for GNSS measurement period T1 BTg_est: GNSS estimated displacement of the top of building B BTg_ave: Building B top GNSS average position (moving average: MA) BTg_Δ: Building B top vibration amount HB: Height of building B (equivalent to the height from the ground of building B to GNSS sensor 31) BTi: Integrated equivalent displacement of the top of building B (double integral of acceleration) ...Integration result of time history data at acceleration sampling period T2 (zero-order interpolation) BB: Displacement of base of building B

[0024] The following variables are used to analyze the deformation of Building C. The case of Building C is the same as that of Building A.

[0025] CT: Displacement of the top of building C CTg: GNSS-measured displacement at the top of building C...Time history data for the GNSS measurement period T1 CTg_est: GNSS estimated displacement of the top of building C CTg_ave: Building C top GNSS average position (moving average: MA) CTg_Δ: Building C top vibration amount HC: Height of building C (equivalent to the height from the ground of building C to the GNSS sensor 41) CTi: Integrated displacement of the top of building C (double integral of acceleration) ...Integration result of time history data at acceleration sampling period T2 (zero-order interpolation) CB: Displacement of base of building C

[0026] ·Relationship between the acceleration sensor system of building A It is assumed that the displacement AT of the top of building A is approximately equal to the integrated converted displacement ATi of the top of building A. The integrated converted displacement ATi of the top of building A is divided into the low frequency component "integrated converted average position ATi_ave of the top of building A" and the high frequency component "relative displacement ATi_Δ relative to the integrated converted average position of the top of building A", and the relationship between them is defined as shown in equation (1).

[0027] AT≒ATi =(ATi_ave+ATi_Δ) (1)

[0028] Assume that the base displacement AB of Building A is approximately equal to the integrated converted base displacement ABi of Building A. This relationship is shown in equation (2).

[0029] AB≒ABi (2)

[0030] The actual deformation of building A can be determined by the relational expression (3).

[0031] Actual deformation of building A = (AT-AB) ≒ (ATi-ABi) (3)

[0032] The above-mentioned detected values ​​and integral converted values ​​are time history data of the measurement period of the acceleration sensor. The measurement period of the acceleration sensor is set to be sufficiently shorter than the measurement period T1 of the GNSS.

[0033] The deformation degree of building A is defined as the "deformation degree of building A" using the relative displacement of the top of building A and the building height H as shown in equation (4).

[0034] (Deformation degree of building A) = ATi_Δ / H = (ATi-ABi) / H (4)

[0035] This "degree of deformation of Building A" is used to evaluate the soundness of Building A.

[0036] ·Relationship between the acceleration sensor systems of Building B and Building C By not installing acceleration sensors in buildings B and C, there is no need to define and use a relational equation based on the detection results of an acceleration sensor like building A. Instead, the displacement of buildings B and C is analyzed using the measurement values ​​of the acceleration sensor in building A.

[0037] GNSS system equation for building A It is assumed that the building A top displacement AT, the building A top GNSS displacement ATg, and the building A top GNSS estimated displacement ATg_est are approximately equal.

[0038] The GNSS displacement ATg of the top of building A is separated into the low frequency component "GNSS average position ATg_ave of the top of building A" and the high frequency component "relative displacement amount ATg_Δ to the GNSS average position of the top of building A", and the relationship between them is defined as in equation (5A). This equation (5A) corresponds to equation (1) above. The difference between the displacement AT of the top of building A and the GNSS displacement ATg of the top of building A is the measurement error A. This relationship is shown in equation (5B).

[0039] AT≒ATg=ATg_est=(ATg_ave+ATg_Δ) (5A) AT-ATg = Measurement error A (5B)

[0040] GNSS system equation for building B It is assumed that the building B top displacement BT, the building B top GNSS displacement BTg, and the building B top GNSS estimated displacement BTg_est are approximately equal.

[0041] The GNSS displacement BTg of the top of building B is separated into the low frequency component "GNSS average position of the top of building B BTg_ave" and the high frequency component "relative displacement amount BTg_Δ to the GNSS average position of the top of building B", and the relationship between them is defined as in equation (6). This equation (6) corresponds to equation (1) above. The difference between the displacement BT of the top of building B and the GNSS displacement BTg of the top of building B is the measurement error B. This relationship is shown in equation (7).

[0042] BT≒BTg=BTg_est=(BTg_ave+BTg_Δ) (6) BT-BTg = measurement error B (7)

[0043] Next, the prerequisites for the analysis of the embodiment will be summarized as follows. The distance between the base of Building A and the base of Building B is constant relative to the initial value (matches within a specified range). (If it is no longer within the specified range, it is an exception to the process below. For example, it can be assumed that an active fault, landslide, etc. has occurred.) The heights of buildings A and B (sensor installation heights) are known. Building A and Building B are located within an area where it can be assumed that the timing of the earthquake motion arriving at the building is approximately the same.

[0044] <Analysis procedure> (Detection of acceleration, displacement, and seismic motion) The procedure for detecting acceleration, displacement, and seismic motion is shown below. The acceleration sensor 81 detects the acceleration at the top of building A (representative building). The acceleration sensor 82 detects the acceleration of the base of the building A. The acceleration sensor 81 calculates the displacement of the top of the building A based on the detected acceleration value of the top of the building A. The acceleration sensor 82 calculates the displacement of the base of the building A based on the detected acceleration value of the base of the building A. For example, the acceleration sensor 82 detects that the ground has shaken more than a predetermined magnitude. The acceleration sensor 82 notifies the server of the detection result.

[0045] (GNSS positioning: always applied (or after the activation condition is met)) The procedure for detecting displacement and seismic motion using each GNSS sensor is shown below. Each GNSS sensor measures the position of the top of each building and acquires time history data. Each GNSS sensor calculates the moving average and vibration component of the positioning results. Each GNSS sensor detects ground shaking greater than a specified magnitude and notifies the server of the detection result.

[0046] (Acceleration / displacement detection results based on seismic motion and time axis correction of GNSS positioning results) Next, the detection result of acceleration / displacement based on seismic motion and the time axis correction of the GNSS positioning result will be described with reference to FIG. 2A. There may be a time difference in the time axis direction between the time corresponding to the detection by the acceleration sensors 81 and 82 and the time corresponding to the detection by the GNSS sensors 21, 31, 41, etc. An example of correcting this deviation in the time axis direction will be described.

[0047] The acquisition unit 11 acquires displacement data based on acceleration / displacement and data based on the detection results of GNSS positioning. The analysis processing unit 12 performs the calculations of the above equations (1) to (3). The analysis processing unit 12 performs the calculations of the above equations (4) to (7). The analysis processing unit 12 synchronizes the timing at which displacements that can be determined to be earthquakes are detected, thereby synchronizing the detection results of all GNSS sensors and acceleration sensors in this system with a common time. In the top row of Figure 2A, the times when acceleration / displacement based on seismic motion was detected are indicated by ● marks. Periods when no detection was detected are indicated by X marks. A circle is indicated two positions after the first ● mark. At the time of this circle, the acceleration from the start of measurement is integrated twice to determine the displacement corresponding to the start time of acceleration detection. The times when the GNSS sensor performed positioning are indicated by ● marks in the lower part of Figure 2A. Positioning using a GNSS sensor has a longer period for determining detection timing than detection using an acceleration sensor. Therefore, the time axis of the detection time of acceleration / displacement based on seismic motion is aligned with the time axis of the GNSS positioning time.

[0048] (Distance from the top of Building A to the top of Building B) Next, the distance from the top of building A to the top of building B will be described with reference to Figure 2B. The above relationship is shown in equation (8). The position AT of the top of building A and the position BT of the top of building B are expanded using the above equations (4) and (6).

[0049] BT-AT =(BTg_ave+BTg_Δ)-(ATg_ave+ATg_Δ) =(BTg_ave-ATg_ave)+(BTg_Δ-ATg_Δ) (8)

[0050] The first term on the right-hand side of the result of rearranging the above equation (8) represents the average position of the top of the buildings, and the second term on the right-hand side represents the difference in displacement of the tops of Building A and Building B due to earthquake vibrations.

[0051] (Distance between the bases of Building A and Building B) Next, the distance from the base of building A to the base of building B is shown in equation (9).

[0052] BB-AB=(BTg_ave-ATg_ave) (9)

[0053] (Building B story displacement) Next, the story displacement of Building B is shown in Equation (10). The position BT of the top of Building B and the position BB of the base of Building B are expanded using the above-mentioned Equations (8) and (9).

[0054] BT-BB =(BTg_ave-ATg_ave)+(BTg_Δ-ATg_Δ)+ATi_Δ-(BTg_ave-ATg_ave) =(BTg_Δ-ATg_Δ)+ATi_Δ (10)

[0055] As described above, the inter-story displacement of building B can be obtained without installing an acceleration sensor in building B.

[0056] In the above equation, "ATg_Δ" and "ATi_Δ" indicate the position of the top of building A in the same building A, and by assuming that these positions are equal, the displacement "BTg_Δ" of the top of building B relative to the ground of building B can be obtained without detecting the position of the ground of building B.

[0057] The soundness assessment system 1 of this embodiment includes an acceleration sensor (first position sensor) 81 provided at the base of building A (first building), an acceleration sensor (second position sensor) 82 provided at the top of building A (first building), a GNSS sensor (first GNSS sensor) 21 provided at the top of building A (first building), a GNSS sensor (second GNSS sensor) 31 provided at the top of building B (second building), and first position information detected by the acceleration sensor (first position sensor) 81 and the acceleration sensor (second position sensor) 82. and an analysis processing unit that derives a deformation amount of building A (first building) using second position information detected by the first GNSS sensor (21), derives a change in the distance between the top of building A (first building) and the top of building B (second building) using the first position information detected by the first GNSS sensor (21) and the second position information detected by the second GNSS sensor (31), and evaluates the soundness of building B (second building) based on the deformation amount of building A (first building) and the change in the distance between the top of building A (first building) and the top of building B (second building). This allows the soundness assessment system 1 to improve the reliability of the building soundness assessment system. The first location information is information indicating the location of the base of building A (first building). The second position information is information indicating the position of the top of building B (second building).

[0058] In addition, the analysis processing unit 12 assumes that the change in the distance between the base of building A (first building) and the base of the second building before and after the earthquake is within a negligible range, and may consider that the deformation of building A (first building) and the change in the distance between the top of building A (first building) and the top of building B (second building) are due to the deformation of building A (first building) and the deformation of building B (second building).

[0059] In addition, the analysis processing unit 12 synchronizes the first position information detected by the acceleration sensor (first position sensor) 81, the second position information detected by the acceleration sensor (second position sensor) 82, the first position information detected by the GNSS sensor (first GNSS sensor) 21, and the second position information detected by the GNSS sensor (second GNSS sensor) 31 at the timing when the first position information or the second position information is detected.

[0060] For example, when an earthquake occurs in which the horizontal displacement of the top of the building to be evaluated is greater than the accuracy of the horizontal position obtained using the GNSS sensor (first GNSS sensor) 21, the analysis processing unit 12 may perform a soundness evaluation of the building A that has been subjected to the earthquake.

[0061] As described above, the GNSS sensor 41 (third GNSS sensor) is provided at the top of the building C (third building). The analysis processing unit 12 derives the change in the distance between the top of building A (first building) and the top of building C (third building) using the above-mentioned first position information and third position information detected by the GNSS sensor 41 (third GNSS sensor). This third position information is information indicating the position of the top of building C (second building). This allows the analysis processing unit 12 to evaluate the soundness of building C (third building) based on the amount of deformation of building A (first building) and the amount of change in the distance between the top of building A (first building) and the top of building C (third building).

[0062] (Second embodiment) In the second embodiment, an example of an estimation method for estimating the soundness of a building using the analysis results of multiple buildings will be described. In this embodiment, acceleration sensors are installed at the top and base of each of multiple representative buildings to detect their positions. In the following explanation, building A and building D will be used as examples of multiple buildings equipped with acceleration sensors.

[0063] Fig. 4A is a diagram for explaining a soundness evaluation system 1A according to an embodiment, and Fig. 4B is a configuration diagram of the soundness evaluation system 1A according to an embodiment.

[0064] The soundness assessment system 1A includes a building D as an assessment target building in addition to buildings A, B, and C. Building D is an example of a fourth building. The measurement system in building D is as follows.

[0065] (Measurement system in building D) A GNSS sensor 41 and an acceleration sensor 83 are placed on the roof of a building D, and an acceleration sensor 84 is placed at the base of the building D.

[0066] (Soundness evaluation system) The soundness assessment system 1A includes an acquisition unit 11A and an analysis processing unit 12A instead of the acquisition unit 11 and the analysis processing unit 12 of the soundness assessment system 1.

[0067] The acquisition unit 11A acquires the detection results of the GNSS sensors 21, 31, 41, and 51 (specific GNSS sensor). The acquisition unit 11A includes interfaces capable of communicating with the GNSS sensors 21, 31, 41, and 51. The type of this interface can be selected as appropriate. Acquisition unit 11A further acquires the detection results of acceleration sensor 81, the detection results of acceleration sensor 82, the detection results of acceleration sensor 83, and the detection results of acceleration sensor 84. Acquisition unit 11A includes an interface capable of communicating with each of acceleration sensors 81, 82, 83, and 84. Note that the functions of acquisition unit 11A may be configured separately for each building.

[0068] The analysis processing unit 12A uses the detection results of the GNSS sensors 21 and 31 and the detection results of the acceleration sensors 81 and 82 to evaluate the soundness of, for example, buildings A and B, respectively. Furthermore, the analysis processing unit 12A uses the detection results of the GNSS sensor 51, the detection results of the GNSS sensor 31, the detection results of the acceleration sensor 83, and the detection results of the acceleration sensor 84 to evaluate the soundness of, for example, the buildings D and B, respectively. Note that, in the above processing, the detection results of the GNSS sensor 41 do not need to be used. The analysis processing unit 12A may further use the detection results of the GNSS sensor 41 in a manner similar to that described above to evaluate the healthiness of, for example, buildings A and C, and also evaluate the healthiness of buildings D and C, respectively. The above evaluation will be described in detail later.

[0069] Deformation of buildings due to an earthquake and the positional relationship of multiple buildings will be described with reference to FIG. Figure 5 is a diagram for explaining deformation of buildings due to an earthquake and the positional relationships of three buildings in an embodiment. Figures 5(a), (b1), and (b2) show elevation views modeling an area including buildings A, B, and D, and these buildings are modeled and indicated by arrows. The left arrow represents building A, the middle arrow represents building B, and the right arrow represents building D. The inclination of the arrows represents the inclination of the buildings. Figure 5(a) shows the normal state, while Figure 5(b1) and (b2) show the state affected by the earthquake. The situation at the same time is shown separately in Figure 5(b1) and (b2). The inclination of the arrows (buildings) in Figure 5(b1) and (b2) indicates the tilted state of the buildings. In this figure, building B is tilted more than building A and building D.

[0070] (Definition of symbols and variables in the figure) In addition to the variables related to building A and building B exemplified in the first embodiment, the following variables used in analyzing the deformation of building D will be described. DT: Building D top displacement (position information in a three-dimensional coordinate system. The same applies below.) DTg: GNSS measured displacement of the top of building D...Time history data for GNSS measurement period T1 DTg_est: GNSS estimated displacement of the top of building D DTg_ave: Building D top GNSS average position (moving average: MA) DTg_Δ: Relative displacement from the reference position of the top of building D HD: Height of building D (equivalent to the height from the ground of building D to GNSS sensor 51) DTi: Building D top integral equivalent displacement (double integral of acceleration) ...Integration result of time history data at acceleration sampling period T2 (zero-order interpolation) DTi_ave: Building D top integral converted average position (moving average: MA) DTi_Δ: Relative displacement from the average position of the top of building D DB: Displacement of base of building D DBi: Building D base integral conversion displacement (double integral of acceleration) ...Integration result of time history data at acceleration sampling period T2 (zero-order interpolation)

[0071] Building D, like building A described above, is provided with acceleration sensors at its top and base to detect its respective positions. The variables related to building D above correspond to the variables of building A. Therefore, for a detailed explanation of the variables related to building D, please refer to the explanation of the variables of building A, and a detailed explanation will be omitted.

[0072] (An example of a method for estimating damaged locations using the analysis results of multiple buildings) The relational expressions applied to building D in this embodiment are shown below.

[0073] ·Relationship between the acceleration sensor system of building D It is assumed that the building D top displacement DT and the building D top integrated converted displacement DTi are approximately equal. The integrated converted displacement DTi of the top of building D is divided into the low frequency component "integrated converted average position DTi_ave of the top of building D" and the high frequency component "relative displacement DTi_Δ to the integrated converted average position of the top of building D", and the relationship between them is defined as shown in equation (11).

[0074] DT≒DTi=(DTi_ave+DTi_Δ) (11)

[0075] It is assumed that the base displacement DB of building D is approximately equal to the integrated converted base displacement DBi of building D. This relationship is shown in equation (12).

[0076] DB≒DBi (12)

[0077] The actual deformation of building D can be defined by the relational expression (13).

[0078] Actual deformation of building D = (DT-DB) ≒ (DTi-DBi) (13)

[0079] The above-mentioned detected values ​​and integral converted values ​​are time history data of the measurement period of the acceleration sensor. As described above, the measurement period of the acceleration sensor is set to be sufficiently shorter than the measurement period T1 of the GNSS.

[0080] The degree of deformation of building D is defined as "the degree of deformation of building D" using the relative displacement of the top of building D and the building height H as shown in equation (14).

[0081] (Deformation degree of building D) = DTi_Δ / H = (DTi-DBi) / H (14)

[0082] This "degree of deformation of Building D" is used to evaluate the soundness of Building D.

[0083] ·Relationship between the acceleration sensor system of building B As mentioned above, no acceleration sensor is installed in building B. As for building B, the displacement of building B is analyzed using the measurement values ​​of the acceleration sensors in buildings A and D, as described above.

[0084] · GNSS system relationship for building D It is assumed that the building D top displacement DT, the building D top GNSS displacement DTg, and the building D top GNSS estimated displacement DTg_est are approximately equal.

[0085] The GNSS displacement DTg of the top of building D is separated into the low frequency component "GNSS average position DTg_ave of the top of building D" and the high frequency component "relative displacement amount DTg_Δ to the GNSS average position of the top of building D", and the relationship between them is defined as in equation (15A). This equation (15A) corresponds to equation (11) above. The difference between the displacement DT of the top of building D and the GNSS displacement DTg of the top of building D is the measurement error D. This relationship is shown in equation (15B).

[0086] DT≒DTg=DTg_est=(DTg_ave+DTg_Δ) (15A) DT-DTg = measurement error D (15B)

[0087] ·Relationship between the GNSS systems of Building A and Building B The relational equations of the GNSS systems of Building A and Building B refer to the above equations.

[0088] ·Relationship between the GNSS systems of Building D and Building B The relational equation between the GNSS systems of buildings D and B uses the same relational equation as the relational equation between the GNSS systems of buildings A and B described above.

[0089] In this embodiment, among buildings A, B, and D, buildings A and D are equipped with acceleration sensors. By using the measurement values ​​of the acceleration sensors of buildings A and D, the states of buildings A and D can be derived individually.

[0090] In the first embodiment described above, an example in which the state of building B is derived based on the state of building A as a reference has been described. By using a method similar to that of the example of this embodiment, the state of building B can be derived further using the state of building D as a reference.

[0091] According to the above procedure, it is possible to obtain a result in which the state of building B is derived based on the state of building A, and a result in which the state of building B is derived based on the state of building D.

[0092] As in the first embodiment, if the result of deriving the state of building B based on the state of building A is used instead of the result of deriving the state of building B based on the state of building D, the detection of the state of building B would depend on the state of building A. In contrast, in this embodiment, the state of building B can be detected under conditions that are not dependent on the state of building A. If a disaster occurs that causes damage to each building, the reference buildings (Building A and Building D) may also be damaged. By providing multiple reference buildings as in this embodiment, the risk in the event of a disaster can be reduced.

[0093] As described above, the analysis processing unit 12 obtains two results as the state of building B: one derived based on the state of building A as a reference, and the other derived based on the state of building D as a reference.

[0094] For example, if the reliability of both results is high, the analysis processing unit 12 may perform calculations such as averaging or weighted averaging the estimated position of the top of building B based on the positions indicated by the above two results, thereby suppressing the noise components contained in the two results.

[0095] However, there may be cases where the reliability of one of the two results is insufficient. In such cases, the estimated results of the location of building B may take different values. If the difference is within a predetermined range, the difference may be treated as an error.

[0096] According to the above embodiment, the analysis processing unit 12 derives the amount of deformation of building A (first building) using first position information (displacement of the top of building A) detected by the acceleration sensor 81 (first position sensor) and second position information (displacement of the base of building A) detected by the acceleration sensor 82 (second position sensor). The analysis processing unit 12 derives the change in the distance between the top of building A (first building) and the top of building B (second building) using first position information (displacement of the top of building A) detected by the GNSS sensor 21 (first GNSS sensor) and second position information (displacement of the top of building B) detected by the GNSS sensor 31 (second GNSS sensor). The analysis processing unit 12 derives the amount of deformation of building B (second building) using the fourth position information (displacement of the top of building D) detected by the acceleration sensor 83 (third position sensor) and the second position information (displacement of the base of building D) detected by the acceleration sensor 84 (fourth position sensor). The analysis processing unit 12 derives the change in the distance between the top of building D (fourth building) and the top of building B (second building) using the fourth position information (displacement of the top of building D) detected by the GNSS sensor 51 (specific GNSS sensor) and the second position information (displacement of the top of building B) detected by the GNSS sensor 31 (specific GNSS sensor). As a result, the analysis processing unit 12 calculates at least the deformation amount of the building A (first building), the change amount of the distance between the top of the building A (first building) and the top of the building B (second building), The soundness of building B (second building) can be evaluated based on the amount of deformation of building D (fourth building) and the amount of change in the distance between the top of building D (fourth building) and the top of building B (second building).

[0097] (Third embodiment) In the third embodiment, an example of a method for estimating damaged locations using analysis results of multiple buildings will be described. Buildings A, B, and C shown below are examples of multiple buildings.

[0098] (An example of a method for estimating damaged locations using the analysis results of multiple buildings)

[0099] STEP 1: In STEP 1 of this embodiment, the above configuration is used to detect the inter-story displacements of buildings B and C relative to building A, and the measurement results of "(inter-story displacement of building B)" and "(inter-story displacement of building C)" are combined and analyzed. The soundness evaluation system 1 performs the following analysis process.

[0100] The example shown below is not an analysis that improves the accuracy of numerical analysis, but an analysis that uses logical analysis to extract the causes when abnormal values ​​are detected.

[0101] The following factors may cause abnormal values ​​in the detection results such as (inter-story displacement of building B) and (inter-story displacement of building C). (a) Damage to Building A (b) Damage to Building B (c) Damage to Building C (d) Damage to the ground between Building A and Building B (e) Damage to the ground between Building A and Building C (f) Damage to the ground between Building B and Building C (g) Damage to the acceleration measurement system of Building A (h) Damage to the GNSS measurement system in Building B (g) Damage to the building CGNSS measurement system

[0102] Among these, (a) Damage to Building A (b) Damage to Building B (d) Damage to the ground between Building A and Building B (g) Damage to the acceleration measurement system of Building A (h) Damage to the GNSS measurement system in Building B This could be a factor that could cause abnormal values ​​in the measurement results of "(Building B's inter-story displacement)."

[0103] As a comparative example, let us assume a configuration in which only "(inter-story displacement of building B)" is detected using a similar configuration. In such a comparative example, even if an abnormal value is detected in the measurement result of "(inter-story displacement of building B)", it is difficult to identify which of the above factors is related.

[0104] Therefore, in this embodiment, the above configuration is used to detect the inter-story displacements of buildings B and C relative to building A, and the measurement results of "(inter-story displacement of building B)" and "(inter-story displacement of building C)" are combined and analyzed. (It is advisable to define this association in advance.)

[0105] Assuming that there are no abnormal values ​​in the measurement results for "(Building C's story displacement)," among the above, factors that are less relevant are eliminated. For example, a possible method for this elimination would be analysis using predetermined criteria (tables). The less relevant factors are listed below. (a) Damage to Building A (c) Damage to Building C (e) Damage to the ground between Building A and Building C (g) Damage to the acceleration measurement system in Building A (g) Damage to the building CGNSS measurement system

[0106] By eliminating these factors, the following factors remain: (b) Damage to Building B (d) Damage to the ground between Building A and Building B (f) Damage to the ground between Building B and Building C: Unknown (h) Damage to the GNSS measurement system in Building B

[0107] As mentioned below, (f) is unclear within the scope of this evaluation. It is recommended to verify (f) in combination with other information. (f) Damage to the ground between Building B and Building C: Unknown

[0108] As a result, when analyzing Building B alone, the following factors can be considered as indistinguishable. (a) Damage to Building A (b) Damage to Building B (d) Damage to the ground between Building A and Building B (g) Damage to the acceleration measurement system in Building A (h) Damage to the GNSS measurement system in Building B

[0109] By the way, although it was not possible to distinguish between the above five factors, if the soundness of Building A can be confirmed, the above five factors can be narrowed down to the following four.

[0110] (b) Damage to Building B (d) Damage to the ground between Building A and Building B (f) Damage to the ground between Building B and Building C: Unknown (h) Damage to the GNSS measurement system in Building B

[0111] In this way, by checking the integrity of building A, it is possible to narrow down the scope to the possibility that the problem is not at least on the building A side, but rather on building B or a problem related to building B.

[0112] STEP 2: In STEP 2, the validity of buildings other than Building A is verified against each other. Therefore, using the above configuration, the inter-story displacements of buildings B and C relative to building A are detected, and the measurement results of "(inter-story displacement of building B)" and "(inter-story displacement of building C)" are combined and analyzed.

[0113] (Analysis using Building B and Building C: Building B is the reference) Next, the distance from the top of building B to the top of building C is shown in equation (11).

[0114] CT-BT =[(CTg_Δ-ATg_Δ)+ATi_Δ]-[(BTg_Δ-ATg_Δ)+ATi_Δ] =(CTg_Δ-BTg_Δ) (11)

[0115] There are two "ATi_Δ" on the right side of the above equation (11). If the simultaneity of the measurement results is guaranteed, these "ATi_Δ" have the same value, so they can be eliminated.

[0116] If there is no abnormality in the mutual distance between the CT and BT, the above four factors: (b) Damage to Building B (d) Damage to the ground between Building A and Building B (f) Damage to the ground between Building B and Building C: Unknown (h) Damage to the GNSS measurement system in Building B From these, factors (f) and (h) can be eliminated, leaving factors (b) and (d) as candidate factors.

[0117] Furthermore, if factors related to ground abnormalities such as (e) and (f) above can be eliminated, it can be expected that there is little possibility of ground abnormalities occurring within the area where the group of buildings being analyzed are located. Therefore, if there are no abnormalities in the ground in this area based on information other than the above analysis, it may be determined that (b) is a more suitable candidate cause than (d).

[0118] According to the above embodiment, the building health assessment system includes a first position sensor provided at the base of a first building, a second position sensor provided at the top of the first building, a first GNSS sensor provided at the top of the first building, a second GNSS sensor provided at the top of a second building, and an analysis processing unit that derives the amount of deformation of the first building using first position information detected by the first position sensor and second position information detected by the second position sensor, and derives the change in the distance between the top of the first building and the top of the second building using the first position information detected by the first GNSS sensor and the second position information detected by the second GNSS sensor, and the analysis processing unit effectively functions to enhance the reliability of the building health assessment system by evaluating the health of the second building based on at least the amount of deformation of the first building and the amount of change in the distance between the top of the first building and the top of the second building.

[0119] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, as well as within the scope of the invention described in the claims and their equivalents. [Explanation of symbols]

[0120] 1,1A Soundness Assessment System 11 Acquisition Department 12 Analysis processing section 13 Output section 21, 31, 41 GNSS sensors 81, 82 Acceleration sensor

Claims

1. a first position sensor provided at the base of the first building; a second position sensor provided at the top of the first building; a first GNSS sensor provided at the top of the first building; a second GNSS sensor provided on the top of the second building; deriving a deformation amount of the first building using first position information detected by the first position sensor and second position information detected by the second position sensor; an analysis processing unit that derives a change in the distance between the top of the first building and the top of the second building using first position information detected by the first GNSS sensor and second position information detected by the second GNSS sensor; Equipped with The analysis processing unit Evaluating the soundness of the second building based on at least the amount of deformation of the first building and the amount of change in the distance between the top of the first building and the top of the second building. Health rating system.

2. The analysis processing unit The change in the distance between the base of the first building and the base of the second building before and after the earthquake is expected to be within a negligible range, and the change in the deformation of the first building and the change in the distance between the top of the first building and the top of the second building are due to the deformation of the first building and the deformation of the second building. The health assessment system according to claim 1 .

3. The analysis processing unit synchronize the first position information detected by the first position sensor, the second position information detected by the second position sensor, the first position information detected by the first GNSS sensor, and the second position information detected by the second GNSS sensor at a timing when the first position information or the second position information is detected; The health assessment system according to claim 1 .

4. A third GNSS sensor installed on the top of the third building Equipped with The analysis processing unit deriving a change in the distance between the top of the first building and the top of the third building using the first position information and third position information detected by the third GNSS sensor; evaluating the soundness of the third building based on the amount of deformation of the first building and the amount of change in the distance between the top of the first building and the top of the third building; The health assessment system according to claim 1 .

5. a first position sensor provided at the base of the first building; a second position sensor provided at the top of the first building; a first GNSS sensor provided at the top of the first building; a second GNSS sensor provided on the top of the second building; a third position sensor provided at the base of the fourth building; a fourth position sensor provided at the top of the fourth building; A specific GNSS sensor provided at the top of the fourth building; an analysis processing unit that evaluates the soundness of the second building; Equipped with The analysis processing unit deriving a deformation amount of the first building using first position information detected by the first position sensor and second position information detected by the second position sensor; deriving a change in the distance between the top of the first building and the top of the second building using first position information detected by the first GNSS sensor and second position information detected by the second GNSS sensor; deriving a deformation amount of the fourth building using third position information detected by the third position sensor and fourth position information detected by the fourth position sensor; deriving a change in the distance between the top of the fourth building and the top of the second building using fourth position information detected by the specific GNSS sensor and the second position information detected by the second GNSS sensor; Evaluating the soundness of the second building based on at least the deformation amount of the first building, the change amount of the distance between the top of the first building and the top of the second building, the deformation amount of the fourth building, and the change amount of the distance between the top of the fourth building and the top of the second building. Health rating system.

6. A method for evaluating the integrity of a building, comprising: a first position sensor is provided at the base of the first building; a second position sensor is provided at the top of the first building; a first GNSS sensor is provided on the top of the first building; a second GNSS sensor is provided at the top of the second building; deriving a deformation amount of the first building using first position information detected by the first position sensor and second position information detected by the second position sensor; deriving a change in the distance between the top of the first building and the top of the second building using first position information detected by the first GNSS sensor and second position information detected by the second GNSS sensor; A soundness assessment method including a step of evaluating the soundness of the second building based on at least the deformation amount of the first building and the change in the distance between the top of the first building and the top of the second building.

7. A method for evaluating the integrity of a building, comprising: a first position sensor is provided at the base of the first building; a second position sensor is provided at the top of the first building; a first GNSS sensor is provided on the top of the first building; a second GNSS sensor is provided at the top of the second building; a third position sensor is provided at the base of the fourth building; a fourth position sensor is provided on the top of the fourth building; A specific GNSS sensor is provided at the top of the fourth building, deriving a deformation amount of the first building using first position information detected by the first position sensor and second position information detected by the second position sensor; deriving a change in the distance between the top of the first building and the top of the second building using first position information detected by the first GNSS sensor and second position information detected by the second GNSS sensor; deriving a deformation amount of the fourth building using third position information detected by the third position sensor and fourth position information detected by the fourth position sensor; deriving a change in the distance between the top of the fourth building and the top of the second building using fourth position information detected by the specific GNSS sensor and the second position information detected by the second GNSS sensor; A soundness assessment method including a step of evaluating the soundness of the second building based on at least the deformation amount of the first building, the change in the distance between the top of the first building and the top of the second building, the deformation amount of the fourth building, and the change in the distance between the top of the fourth building and the top of the second building.

Images