JP6450631B2 - Interlayer displacement measurement system, interlayer displacement measurement method, and program - Google Patents

Description

  The present invention relates to an interlayer displacement measurement system, an interlayer displacement measurement method, and a program.

It is known that building deformation occurs when an earthquake occurs. As an index for evaluating the soundness of a building after an earthquake, a value obtained by dividing a horizontal displacement difference between layers by a floor height (interlayer deformation angle) is often used.
In addition, in order to evaluate the soundness of an elevator when an earthquake occurs, there is an earthquake damage measurement system that installs optical measurement equipment such as a CCD camera in the elevator hoistway and measures the distortion of the elevator hoistway. (For example, refer to Patent Document 1).

JP 2008-281435 A

  However, even if the elevator hoistway distortion is detected as in Patent Document 1, the deformation amount of the core portion provided with the elevator hoistway or the like does not necessarily match the deformation amount of the building. In addition, there is a floor in a place other than the core part such as an elevator hoistway, and a measurement method applied to an elevator hoistway or the like provided through each layer of the building is applied to a place other than the core part. It is difficult. As described above, in the method disclosed in Patent Document 1 or the like, the interlayer deformation of the building may not be accurately measured.

  The present invention has been made in view of such circumstances, and provides an interlayer displacement measurement system, an interlayer displacement measurement method, and a program for accurately measuring interlayer deformation of a building.

  One aspect of the present invention for solving the above-described problem is that the image data obtained by photographing the subject provided in the second layer by the imaging unit provided in the first layer of the building including a plurality of layers, An interlayer displacement measuring unit that obtains an interlayer displacement between the first layer and the second layer based on a position in a captured image of a subject is provided, and the interlayer displacement measuring unit is a vibration of a building before an earthquake occurs. The inter-layer displacement measuring system is characterized in that a signal component in a signal band determined according to characteristics is extracted from a component of horizontal vibration caused by the earthquake.

  The interlayer displacement measurement system includes an acceleration measurement unit that detects an occurrence of an earthquake, and the interlayer displacement measurement unit receives the signal from the video data after the earthquake vibration detected by the acceleration measurement unit is settled. A component is extracted, and the interlayer displacement is obtained using the extracted signal component.

  In the interlayer displacement measuring system, the acceleration measuring unit detects the vibration of the building before the occurrence of the earthquake, determines the signal band from the detected vibration of the building before the occurrence of the earthquake, and the interlayer displacement The measurement unit extracts a signal component included in the determined signal band from the video data.

  In the interlayer displacement measuring system, the acceleration measuring unit obtains a natural frequency of the building from the detected vibration of the building before the occurrence of the earthquake, and includes a signal component of the obtained natural frequency. The signal band is determined as described above, and the inter-layer displacement measuring unit extracts the signal component included in the determined signal band from the video data so that the signal component of the determined natural frequency is included. It is characterized by.

  In the above interlayer displacement measuring system, the acceleration measuring unit may determine the signal band so as to include up to the main vibration component of the building, and the interlayer displacement measuring unit may include up to the main vibration component. A signal component included in the predetermined signal band is extracted from the video data.

  According to another aspect of the present invention, the building indicated by the video data is obtained from video data obtained by capturing an interlayer deformation of the building by an imaging unit provided in a first layer of a building including a plurality of layers. Converting the inter-layer deformation into an inter-layer displacement between the first layer and the second layer, and converting the signal component of the signal band determined according to the vibration characteristics of the building before the earthquake to the horizontal And a step of extracting from the video data as a component of directional vibration.

  According to another aspect of the present invention, the building indicated by the video data is obtained from video data obtained by capturing an interlayer deformation of the building by an imaging unit provided in a first layer of a building including a plurality of layers. Converting the inter-layer deformation into an inter-layer displacement between the first layer and the second layer, and converting the signal component of the signal band determined according to the vibration characteristics of the building before the earthquake to the horizontal A program for causing a computer to execute the step of extracting from the video data as a vibration component in a direction.

  As described above, according to the present invention, it is possible to provide an interlayer displacement measurement system, an interlayer displacement measurement method, and a program that accurately measure interlayer deformation of a building.

It is a conceptual diagram showing the example of a structure of the interlayer displacement measuring system by the 1st Embodiment of this invention. It is sectional drawing which shows arrangement | positioning of the imaging part of the specific floor by this embodiment. It is a block diagram which shows schematic structure of the interlayer displacement measuring system by this embodiment. It is explanatory drawing which shows the constant micro vibration of the building by this embodiment. It is explanatory drawing which shows the principle of the interlayer displacement measuring system by this embodiment. It is a flowchart which shows the procedure of the process in the interlayer displacement measuring system by this embodiment. It is a flowchart which shows the procedure of the process in step Sa30 of FIG. It is sectional drawing which shows arrangement | positioning of the imaging part of the specific floor by 2nd Embodiment. It is a block diagram which shows schematic structure of the interlayer displacement measuring system by this embodiment. It is explanatory drawing shown about the influence with respect to interlayer displacement when the attachment angle of the imaging part by this embodiment changes. It is explanatory drawing which shows the prescription | regulation method of the data area which shows the unit period of the analysis by 3rd Embodiment. It is a flowchart which shows the procedure of the process by 3rd Embodiment in step Sa30 of FIG.

An outline of the interlayer displacement measurement system in the embodiment of the present invention will be described.
An interlayer displacement measuring system according to an embodiment of the present invention captures an object from video data obtained by photographing an object provided on a second layer by an imaging unit provided on a first layer of a building composed of a plurality of layers. A conversion unit is provided that obtains an interlayer displacement between the first layer and the second layer based on a position in the image. The conversion unit extracts a signal component of a signal band determined according to the vibration characteristics of the building before the occurrence of the earthquake from the component of the horizontal vibration caused by the earthquake.
Such an interlayer displacement measurement system can accurately measure interlayer deformation of a building.

[First Embodiment]
Hereinafter, the interlayer displacement measuring system according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a conceptual diagram illustrating a configuration example of an interlayer displacement measuring system according to a first embodiment of the present invention.
In FIG. 1, the interlayer displacement measurement system 1 acquires image data captured at the time of an earthquake from each of the imaging units 15 ₁ to 15 _n (1 to n is the number of floors of the building) provided in the building 100. Each 15 _n from the imaging unit 15 ₁ outputs the image data obtained by imaging a subject provided in the floor of the layer adjacent to the layer of floor respectively provided (upper floor) (lower floor). Here, the imaging unit 15 is arranged on each floor of the building 100 as shown in FIG. If the building 100 of FIG. 1 is a six storey building, the ground floor 100 _first imaging unit 15 ₁ is disposed on the second floor 100 ₂ imaging unit 15 ₂ is disposed on the third floor 100 ₃ imaging unit 15 ₃ There are disposed, the imaging unit 15 ₄ is disposed on the fourth floor 100 _4, the imaging unit 15 ₅ is placed on the fifth floor 100 _5, the imaging unit 15 ₆ is disposed on the sixth floor 100 _6.
Further, in correspondence from the imaging unit 15 ₁ to 15 _n, from the interlayer displacement measuring unit 11 ₁ 11 _n are provided on each floor. 11 _n from the interlayer displacement measuring unit 11 _1, respectively, by the imaging unit 15 ₁ 15 _n based on the video data of the result of the imaging, the one of the imaging unit from the imaging unit 15 ₁ 15 _n are provided Interlayer displacement between the first layer and the second layer that hits the subject of the imaging unit is obtained.
An acceleration measuring unit 16 is disposed on the roof 100 _R of the building 100. Further, the acceleration measuring section 16 is not necessarily a roof 100 _R, may be located at the top of the top floor or building 100 of the roof 100 _R vicinity.
Further, the interlayer displacement measurement system 1 may be configured to include the natural period measurement unit 12, the building safety evaluation unit 13, and the database 14 in addition to the above configuration.

FIG. 2 is a cross-sectional view showing the arrangement of the imaging units on a specific floor. For example, the imaging unit 15 ₁ is disposed in a ceiling of the first floor 100 _1. The imaging unit 15 _1, under floor slab or beam, deformation is installed in places difficult to occur by the earthquake, such as beam-column joints. The imaging unit 15 _1, so that the optical axis L is vertical, the direction of the optical axis L is fixed toward the floor surface, imaging an object on the first floor of the bed. Isosceles triangle D1 and D2 of the lower side of the imaging unit 15 ₁ in the figure, simulated showing the imaging range of the imaging unit 15 _1. The direction of the optical axis L of the imaging unit 15 ₁ may be a vertical or obliquely downward. Further, the subject is not limited to the object fixed on the floor and placed on the lower floor so as not to move due to vibration such as an earthquake, but may be a figure or the like drawn on the floor.
This figure shows a state in which no distortion is generated in the building 100 during normal times (solid line) and a state in which distortion due to an earthquake occurs (dotted line). In a state where distortion occurs, a state in which the ceiling and the floor are displaced by Δx in the horizontal direction with respect to the height h1 of the _first floor 1001 is shown. As shown in equation (1), the interlayer displacement in this case is Δx, and φ is the interlayer deformation angle.

Δx = (h1) tanφ (1)

With reference to FIG. 3, a schematic configuration of the interlayer displacement measurement system 1 will be described. FIG. 1 is a configuration diagram showing a schematic configuration of the interlayer displacement measuring system 1. The figure shows a configuration for obtaining the interlayer displacement for the first floor height.
The interlayer displacement measuring system 1 shown in the figure includes an imaging unit 15, an acceleration measuring unit 16, and an interlayer displacement measuring unit 11.
The imaging unit 15 is provided in a first layer of a building composed of a plurality of layers. The imaging unit 15 images the subject provided in the second layer and outputs video data indicating the subject image Xp. An image (Xp) of a subject that is not affected by the vibration appears in the image in a state where there is no vibration due to the earthquake. On the other hand, an image of the subject affected by the vibration g (Xp) appears in the image in a state where there is the vibration g due to the earthquake. Here, the video data indicating the subject image (Xp) affected by the vibration g includes a signal component (Xp + Xg) of the subject image shaken by the shake Xg caused by the vibration g.

  The inter-layer displacement measuring unit 11 is configured based on the video data output from the imaging unit 15 based on the position in the captured image of the subject (first layer) and the subject of the imaging unit 15. Interlayer displacement between the layers to be (second layer) is obtained. For example, the interlayer displacement measuring unit 11 calculates the amount of movement of the position of the subject in the captured image as the number of pixels corresponding to the amount of movement, using the size of the pixel as a reference. The interlaminar displacement measurement unit 11 extracts the signal component of the signal band determined according to the vibration characteristics of the building 100 before the occurrence of the earthquake from the horizontal vibration component due to the earthquake after the earthquake vibration has subsided. To obtain the interlayer displacement.

  The acceleration measuring unit 16 detects the vibration of the building 100 before the occurrence of the earthquake, and from the detected vibration of the building 100 before the occurrence of the earthquake (vibration due to forced vibration due to constant tremor or human force excitation). The signal band is determined according to 100 vibration characteristics. The acceleration measuring unit 16 detects a period in which vibration due to the earthquake has arrived at the building when the earthquake occurs.

The principle of the interlayer displacement measuring system 1 will be described with reference to FIGS. FIG. 4 is an explanatory diagram showing the constant microvibration of the building. In the same figure, an example of the waveform of the constant micro vibration St of the building 100 which the acceleration measurement part 16 detects is shown. FIG. 5 is an explanatory diagram showing the principle of the interlayer displacement measuring system 1. In the same figure, the energy distribution of the vibration of the building 100 at the time of an earthquake is shown as a spectrum.
The acceleration measuring unit 16 detects a continuous micro vibration St as shown in FIG. 4 and converts the continuous micro vibration St into a frequency component to obtain a spectrum Sf as shown in FIG. Here, f0 represents the primary natural frequency (natural period) of the building 100. In the spectrum Sf, in addition to the component of the primary natural frequency f0, the higher-order frequency component of the building 100 and the frequency component of noise due to various external factors other than the building 100 are also observed. In the example of the figure, the energy up to the third natural frequency component of the spectrum Sf is observed to be larger than the energy of the frequency component equal to or higher than the fourth natural frequency component. Here, a low-pass filter type filter that transmits components from a low frequency region having a frequency lower than the primary natural frequency f0 to a tertiary natural frequency component is determined, and a cutoff frequency fc of the filter is selected. The interlayer displacement measurement system 1 can detect a typical behavior of the building 100 during an earthquake from the frequency components in the above range.
Note that the size of the subject per pixel of the imaging device is determined from the size of the imaging device of the imaging unit 15, the resolution thereof, the focal length of the optical system of the imaging unit 15, and the distance from the subject to the imaging unit 15. calculate. For example, as shown in Expression (2) and Expression (3), the width PICW of one pixel from the size of the imaging device (horizontal width DEVXx vertical width DEVY) and resolution (number of constituent pixels: horizontal NX pixels × vertical NY pixels) Height PICH is determined.

  PICW = DEVX / NX (2)

  PICH = DEVY / NY (3)

  Based on the ratio of the distance L from the subject to the imaging unit 15 and the focal length f of the optical system of the imaging unit 15, the width PICW and the height PICH of one pixel are the actual movement amount of the subject (horizontal direction ΔXpic, vertical The number of millimeters (millimeters) corresponding to the direction ΔYpic) is calculated by the equations (4) and (5).

  ΔXpic = PICWxL / f (4)

  ΔYpic = PICHxL / f (5)

  Depending on how many pixels (horizontal: MX pixels, vertical: MY pixels) the subject image has moved on the imaging surface of the imaging device, the distance in the real space (the distance in the X-axis direction of the real space) : ΔX, distance in the Y-axis direction: ΔY) is calculated from the equations (6) and (7) on the assumption that the subject has moved.

ΔX = (Xpic) x (MX)
= (PICWxL / f) x (MX) (6)

ΔY = (Ypic) x (MY)
= (PICHxL / f) x (MY) (7)

    By the above conversion, the displacement amount (ΔX and ΔY) of the interlayer displacement can be obtained from the number of pixels.

With reference to FIG. 6, the process in the interlayer displacement measuring system 1 will be described. FIG. 3 is a flowchart showing a processing procedure in the interlayer displacement measurement system 1.
In the interlayer displacement measuring system 1, the acceleration measuring unit 16 detects the natural frequency (natural frequency) of the building 100 in normal times (step Sa10). The acceleration measuring unit 16 selects a cut-off frequency fc that transmits components from a lower frequency component to a third natural frequency component than the first natural frequency (f0) with reference to the natural frequency (natural period). Thus, the frequency region including the main component of the vibration is specified (step Sa20).
The inter-layer displacement measuring unit 11 extracts the displacement amount of the subject from the image signal in the frequency domain specified in normal times based on the image data obtained by the imaging unit 15 at the time of the earthquake (step Sa30). The interlayer displacement measuring unit 11 outputs the estimated displacement amount calculated from the extracted displacement amount (step Sa40).

Details of processing in the interlayer displacement measurement system 1 will be described with reference to FIG. This figure is a flowchart showing a detailed procedure of processing of the interlayer displacement measuring system 1 in step Sa30 of FIG.
The acceleration measuring unit 16 detects the acceleration (step Sa31), and determines the occurrence of the earthquake from the detected magnitude of the acceleration (step Sa32). When the occurrence of the earthquake is not detected (step Sa32: No), the occurrence of the earthquake is repeatedly detected.
When the occurrence of an earthquake is detected (step Sa32: Yes), the interlayer displacement measuring unit 11 records the video data captured by the imaging unit 15 (step Sa33).
The acceleration measuring unit 16 determines the end of the earthquake from the detected acceleration (step Sa34). When the end of the earthquake is not detected (step Sa34: No), the video data is continuously recorded.
When the end of the earthquake is detected (step Sa34: Yes), the interlayer displacement measuring unit 11 extracts a feature point from the image indicated by the recorded video data (step Sa35). The interlayer displacement measuring unit 11 calculates an estimated displacement amount from the amount of movement of the feature point extracted from the image indicated by the recorded video data and how many pixels the feature point has moved in the image (step Sa36).

  As described above, the interlayer displacement measurement system 1 can accurately measure the interlayer deformation of the building 100 from the video data obtained by the imaging unit 15.

(Modification of the first embodiment)
As shown in FIG. 1, the interlayer displacement measurement system 1 may include a natural period measurement unit 12, a building safety evaluation unit 13, and a database 14.
The natural period measuring unit 12 performs signal processing on the micro vibration data supplied from the acceleration measuring unit 16 after the occurrence of the earthquake. That is, the natural period measurement unit 12 performs Fourier analysis of the micro vibration data and estimates the natural frequency. And the building safety evaluation part 13 calculates | requires the period of the extracted natural frequency, and makes this period the natural period T.

  The building safety evaluation unit 13 determines the degree of damage on all floors from the first floor to the nth floor in the building 100 or the installation floor of the imaging unit 15. The building safety evaluation unit 13 compares the natural period calculated before and after the earthquake with the fluctuation threshold of the natural period, compares the natural period T ′ after the earthquake with the natural period T before the earthquake, It is determined whether it is within the range. At this time, if the natural period T ′ is outside the range of the fluctuation threshold, the building safety evaluation unit 13 determines that the building 100 is in an unsafe state, while the natural period T ′ is the fluctuation threshold. When it is within the range, it is determined that there is a high possibility that the building 100 is not damaged in an unsafe state. For details of the determination process in the building safety evaluation unit 13, a method described in Japanese Patent Application Laid-Open No. 2014-134436 may be applied.

  The database 14 stores determination conditions used for various determinations, and time history of accelerations detected in the past.

  The interlayer displacement measuring system 1 configured as described above can function as a building safety evaluation system. When the interlayer displacement measurement system 1 is caused to function as a building safety evaluation system, the building safety evaluation unit 13 detects a change in the natural period measured by the natural period measurement unit 12, and is detected by each interlayer displacement measurement unit 11. The safety of the building 100 can be evaluated based on the magnitude of the interlayer displacement.

[Second Embodiment]
Hereinafter, the interlayer displacement measuring system according to the second embodiment of the present invention will be described with reference to FIG.
FIG. 8 is a cross-sectional view showing the arrangement of the imaging units on a specific floor. For example, the interlayer displacement measurement system 1A, the imaging unit 15A ₁ is arranged on the ceiling side of the first floor 100 _1. So as to form a predetermined angle θ optical axis L of the imaging unit 15A ₁ is with respect to the vertical, the imaging unit 15A ₁ in the direction of the optical axis L toward the floor surface is fixed to the ceiling, the imaging unit 15A ₁ is , imaging an object on the first floor 100 ₁ bed. In the drawing a triangle D3 of the lower side of the imaging unit 15A ₁ D4 is simulated showing the imaging range of the imaging unit 15A _1. In addition, the subject is not limited to being fixed on the floor so as not to move to the floor as in the case described above, and may be a figure drawn on the floor.
Incidentally, the imaging unit 15A _1, the angle detector 17 for detecting the mounting angle of the imaging unit 15A ₁ is provided.
This figure shows a state in which no distortion is generated in the building 100 during normal times (solid line) and a state in which distortion due to an earthquake occurs (dotted line). In a state where the building 100 is distorted, a state in which the ceiling and the floor are displaced by Δx in the horizontal direction with respect to the height h1 of the _first floor 1001 is shown. As shown in the above equation (1), the interlayer displacement in this case is Δx, and φ is the interlayer deformation angle.

Meanwhile, as shown in the figure, the optical axis L of the imaging unit 15A ₁ is provided at a predetermined angle θ with respect to the vertical, the angle θ is detected by the angle detection unit 17. If the initial mounting angle of the angle θ, the optical axis L is directed away htanθ from the position directly below the imaging unit 15A _1. h indicates the distance from the floor surface to the imaging unit 15.
Also, in the figure, due to the earthquake, the mounting angle of the imaging unit 15A ₁ changes during the earthquake, and the optical axis L ′ of the imaging unit 15A ₁ forms a predetermined angle (θ + α) with respect to the vertical. The angle (θ + α) is detected by the angle detector 17.

With reference to FIG. 9, a schematic configuration of the interlayer displacement measuring system 1A will be described. This figure is a block diagram showing a schematic configuration of the interlayer displacement measuring system 1A. The figure shows a configuration for obtaining the interlayer displacement for the first floor height. An interlayer displacement measurement system 1A shown in the figure includes an imaging unit 15A, an acceleration measurement unit 16, an angle detection unit 17, and an interlayer displacement measurement unit 11A.
The same code | symbol is attached | subjected to the same structure as the above-mentioned structure.
The imaging unit 15A corresponds to the imaging unit 15 described above, and is different in that the angle detection unit 17 is attached.
The angle detection unit 17 detects the mounting angle of the imaging unit 15A. For example, the angle detector 17, the mounting angle of the imaging unit 15A, shown at an angle θ to the optical axis L of the imaging unit 15A ₁ makes with the vertical.
The interlayer displacement measuring unit 11A corresponds to the above-described interlayer displacement measuring unit 11, and based on the position in the captured image of the subject from the video data output from the imaging unit 15A, the layer in which the imaging unit 15A is provided ( The inter-layer displacement between the first layer) and the layer (second layer) that becomes the subject of the imaging unit 15A is obtained. The interlaminar displacement measurement unit 11A obtains the mounting angle of the imaging unit 15A from the angle detection unit 17, and corrects the deviation caused by the change in the mounting angle of the imaging unit 15A.

With reference to FIG. 10, the influence on the interlayer displacement when the mounting angle of the imaging unit 15A is changed will be described. FIG. 10 is an explanatory diagram showing the influence on the interlayer displacement when the mounting angle of the imaging unit 15A is changed. FIG. 10A shows the interlayer displacement when the mounting angle of the imaging unit 15A is changed, and FIG. 10B is corrected so as to cancel the influence on the interlayer displacement when the mounting angle of the imaging unit 15A is changed. The results are shown.
Consider a case where the mounting angle of the imaging unit 15A is changed from an angle θ to an angle (θ + α) due to an earthquake.
Affected such as an impact of vibration, there is a case where the mounting angle of the imaging unit 15A ₁ changes. When such a change in the mounting angle occurs, an error due to the change in the mounting angle is detected in the displacement Δx. This error does not change due to vibration and appears as a constant deviation in the post-earthquake value. The magnitude of the deviation ε can be calculated from the following equation (8).

  ε = h {tan (θ + α) −tan θ} (8)

Therefore, by correcting by subtracting the value of the deviation so as to cancel the permanent change in mounting angle of the imaging unit 15A _1, being influenced by the permanent change in the mounting angle of the imaging unit 15A ₁ Therefore, it is possible to obtain the interlayer displacement with the above-described deviation reduced.
If the mounting angle frequently changes within the same earthquake due to an impact, the data should be corrected each time the angle change is measured. Further, there is a case where a change in every moment and the mounting angle by the elastic deformation of the members such as the camera platform that attach the imaging unit 15A _1. In the above case, the deviation occurs not only as “constant deviation” but also as “deviation whose value changes with time”. For example, the deviation ε calculated by the above equation (8) is not treated as a “constant deviation”, and a correction method for subtracting the deviation ε calculated from time to time by the above equation (8) from the measurement data is applied. Thus, the “deviation whose value changes with time” as described above can also be corrected.

  As described above, according to the interlayer displacement measuring system 1A, it is possible to accurately measure the interlayer deformation of a building.

[Third Embodiment]
Hereinafter, an interlayer displacement measuring system according to a third embodiment of the present invention will be described with reference to FIGS. 1 to 6, 11 and 12.

In the description of the above embodiment, the interlayer displacement measurement system 1 (1A) has been described as performing the interlayer displacement analysis and safety evaluation of the building 100 after the earthquake shake has subsided. While the vibration continues due to the vibration by the interlaminar displacement measurement system 1 (1A), the interlaminar displacement analysis of the building 100 and its safety may be evaluated. When analyzing the interlaminar displacement of the building 100 and evaluating its safety while the shaking continues due to the vibration caused by the earthquake, analyze the vibration for each data section corresponding to a period of appropriate length. To obtain the interlayer displacement. For example, as shown in FIG. 11, a plurality of data sections are defined. This figure is an explanatory diagram showing a method of defining a data section indicating a unit period of analysis. Each data section is defined by overlapping periods so that a part of the data section overlaps the data section before and after the data section. For example, the acceleration measuring unit 16 obtains the spectrum Sf corresponding to the section 1 from the data of the data section indicated by the section 1. The interlayer displacement measuring unit 11 performs a process for reducing noise in real time on the spectrum Sf corresponding to the section 1 to obtain an interlayer displacement. The building safety evaluation unit 13 of the interlayer displacement measurement system 1 (1A) performs the safety evaluation of the building 100 based on the spectrum Sf after the noise is reduced.
Interlayer displacement measurement system 1 (1A), following the processing of section 1, performs the Fourier transform for each section of section 2, section 3,. A spectrum Sf corresponding to each of the sections 3,..., Section n is obtained. The interlayer displacement measuring unit 11 performs a process for reducing noise in real time on the spectrum Sf corresponding to each of the sections 2, 3,..., And the section n to obtain the interlayer displacement in each section. The building safety evaluation unit 13 of the interlayer displacement measurement system 1 (1A) performs the safety evaluation of the building 100 based on the spectrum Sf after the noise is reduced.
In addition, the interlayer displacement measurement system 1 (1A) may sequentially display the spectrum Sf of each section obtained in this way on a display unit provided in the building 100.

The procedure of the process shown in FIG. 11 will be described with reference to FIG. FIG. 11 is a flowchart showing the procedure of the process shown in FIG. The processing from step S31 to step S33 shown in the figure corresponds to the processing from step S31 to step S33 in FIG.
After finishing the process of step S33, the interlayer displacement measurement part 11 reads the recorded video data for every area, and extracts the feature point from the image shown by the video data for every area (step Sa35A). The interlayer displacement measuring unit 11 obtains a spectrum Sf corresponding to each section from the movement amount of the feature point extracted from the image data image read out for each section, and performs real-time noise on the spectrum Sf corresponding to each section. Reduce. The interlayer displacement measurement unit 11 performs the above processing and calculates the interlayer displacement (estimated displacement amount).
Further, the interlayer displacement measuring unit 11 may display the estimated displacement amount calculated while the shaking continues due to the vibration caused by the earthquake on the display unit provided in the building 100. The building safety evaluation unit 13 may perform the safety evaluation of the building 100 based on the spectrum Sf after reducing noise (step Sa36A).

The acceleration measuring unit 16 determines the end of the earthquake from the detected acceleration (step Sa37). When the end of the earthquake is not detected (step Sa37: No), the video data is continuously recorded.
When the end of the earthquake is detected (step Sa37: Yes), the processing shown in FIG.

  Thus, the interlayer displacement measurement system 1 (1A) can sequentially display the state of the building 100, and can promptly display the state of the building 100 to the user who uses the building 100.

  As mentioned above, although embodiment of this invention was described, the interlayer displacement measuring system 1 (1A) has a computer system inside. A series of processes related to the above-described process is stored in a computer-readable storage medium in the form of a program, and the above-described process is performed by the computer reading and executing this program. Here, the computer-readable storage medium refers to a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, and the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program. The “computer system” here includes an OS and the like.

  The central processing unit such as a CPU is a ROM for all or part of the processes in the interlayer displacement measuring unit 11, the acceleration measuring unit 16, and the building safety evaluating unit 13 in the interlayer displacement measuring system 1 (1A). It is realized by reading the above program into a main storage device such as RAM or RAM, and executing information processing and arithmetic processing. Of course, each processing unit constituting the interlayer displacement measurement system 1 (1A) may be realized by dedicated hardware.

Here, the correspondence relationship between the present invention and the above embodiment will be supplementarily described.
In the above embodiment, the interlayer displacement measuring system in the present invention corresponds to the interlayer displacement measuring system 1 (1A), the interlayer displacement measuring unit corresponds to the interlayer displacement measuring unit 11, and the acceleration measuring unit corresponds to the acceleration measuring unit 16. .

As mentioned above, although embodiment of this invention was described, the interlayer displacement measuring system 1 (1A) of this invention is not limited only to the above-mentioned illustration example, In the range which does not deviate from the summary of this invention. Of course, various changes can be made.
For example, interlaminar displacement data (displacement data) measured in the interlaminar displacement measurement system 1 (1A) is transferred in real time from the interlaminar displacement measurement unit 11 to the building safety evaluation unit 13, and the displacement data is sequentially stored in the database 14. It may be recorded. By recording such displacement data as time-series information, data indicating the behavior of the building 100 during an earthquake can be left in the database 14.

  In addition, the building safety evaluation unit 13 analyzes the interlayer displacement data (displacement data) measured in the interlayer displacement measurement system 1 (1A), and outputs information related to the safety of the building 100 as a result of the analysis. You may comprise as follows. The building safety evaluation unit 13 may provide a display unit as an output destination of the above information on each floor of the building 100 and sequentially display information on the safety of the building 100 on the display unit. Further, the interlayer displacement measurement system 1 (1A) may be configured to sequentially display information related to the safety of the building 100 using a display unit of a terminal device carried by the user of the building 100.

  In particular, in the building 100, when the core portion is eccentric and the rigidity of the building 100 is planarly biased, torsional vibration or the like is excited, and the deformation amount of the outer peripheral portion of the building 100 is the deformation amount of the core portion. May be larger than In such a case, the interlayer displacement measurement system 1 (1A) evaluates the safety of the building 100 on the basis of the deformation amount of the outer peripheral portion of the building 100, so that the safety according to the magnitude of the deformation of the building 100 is obtained. Can be evaluated appropriately.

(1) The interlayer displacement measuring system 1 shown in the present embodiment is based on video data obtained by photographing a subject provided in the second layer by an imaging unit provided in the first layer of a building composed of a plurality of layers. And an interlayer displacement measuring unit 11 for obtaining an interlayer displacement between the first layer and the second layer based on a position in the captured image of the subject. The interlayer displacement measuring unit 11 extracts the signal component of the signal band determined according to the vibration characteristics of the building before the earthquake occurrence from the component of the horizontal vibration caused by the earthquake, whereby the interlayer displacement measuring system 1 is A vibration component with a reduced noise component is obtained. Thereby, the interlayer displacement measuring system 1 can measure the interlayer deformation of the building 100 with high accuracy.

(2) The interlayer displacement measurement system 1 includes an acceleration measurement unit 16 that detects the occurrence of an earthquake.
The interlayer displacement measuring unit 11 extracts the signal component from the video data after the earthquake vibration detected by the acceleration measuring unit 16 has subsided, and obtains the interlayer displacement using the extracted signal component. Thereby, it is possible to detect the occurrence of the earthquake and the vibrations caused by the earthquake, and the interlayer displacement of the building 100 can be calculated promptly after the earthquake has subsided.

(3) The acceleration measuring unit 16 detects the vibration of the building before the occurrence of the earthquake, and determines the signal band from the detected vibration of the building before the occurrence of the earthquake.
The interlayer displacement measuring unit 11 extracts signal components included in the determined signal band from the video data. Thereby, the signal band peculiar to the building 100 can be specified from the constant microvibration of the actual building 100, the influence of noise can be reduced, and the interlayer displacement due to the earthquake can be obtained.

(4) The acceleration measuring unit 16 obtains the natural frequency of the building from the detected vibration of the building before the occurrence of the earthquake, and determines the signal band so that the signal component of the obtained natural frequency is included. .
The interlayer displacement measuring unit 11 extracts the signal component included in the determined signal band from the video data so that the signal component of the obtained natural frequency is included.
As a result, the natural frequency (natural frequency) of the building 100 can be obtained from the constantly fine vibration of the actual building 100, and the signal band of the effective signal component can be specified based on the natural frequency (natural frequency). It is possible to reduce the influence of noise and obtain an interlayer displacement due to an earthquake.

(5) The acceleration measuring unit 16 determines the signal band so that even the main vibration component of the building 100 is included. The interlayer displacement measuring unit 11 extracts signal components included in the determined signal band from the video data so that even the main vibration component is included.
Thus, the signal band of the effective signal component including the desired natural frequency (natural frequency) component is specified so that the main vibration component of the building 100 is obtained from the actual micro vibration of the actual building 100 or the like. Thereby, interlayer displacement measuring system 1 (1A) can reduce the influence of noise and can obtain interlayer displacement by an earthquake.

1, 1A Interlayer displacement measurement system,
11, 11A Interlayer displacement measurement unit, 15 imaging unit, 16 acceleration measurement unit, 17 angle detection unit

Claims (7)

Based on the position in the captured image of the subject from the video data obtained by photographing the subject provided in the second layer by the imaging unit provided in the first layer of the building composed of a plurality of layers, the first layer And an interlayer displacement measuring unit for obtaining an interlayer displacement between the second layer and the second layer,
The interlayer displacement measuring unit is
An inter-layer displacement measurement system that extracts a signal component of a signal band determined according to a vibration characteristic of a building before an earthquake from a component of a horizontal vibration caused by the earthquake. It has an acceleration measurement unit that detects the occurrence of an earthquake,
The interlayer displacement measuring unit is
The signal displacement is extracted from the video data after the earthquake vibration detected by the acceleration measuring unit is settled, and the interlayer displacement is obtained using the extracted signal component. Interlayer displacement measurement system. The acceleration measuring unit is
Detecting the vibration of the building before the occurrence of the earthquake, determining the signal band from the detected vibration of the building before the occurrence of the earthquake,
The interlayer displacement measuring unit is
The interlayer displacement measuring system according to claim 2, wherein a signal component included in the predetermined signal band is extracted from the video data. The acceleration measuring unit is
Obtain the natural frequency of the building from the detected vibration of the building before the occurrence of the earthquake, determine the signal band so that the signal component of the obtained natural frequency is included,
The interlayer displacement measuring unit is
The interlayer displacement measurement system according to claim 3, wherein a signal component included in the determined signal band is extracted from the video data so that the signal component of the obtained natural frequency is included. The acceleration measuring unit is
The signal band is determined so that up to the main vibration component of the building is included,
The interlayer displacement measuring unit is
The interlayer displacement measuring system according to claim 4, wherein a signal component included in the predetermined signal band is extracted from the video data so that the main vibration component is included. From the video data obtained by photographing the interlayer deformation of the building by the imaging unit provided in the first layer of the building composed of a plurality of layers, the interlayer deformation of the building indicated by the video data is converted into the first layer and the second layer. Converting to an inter-layer displacement between the layers;
Extracting the signal component of the signal band determined according to the vibration characteristics of the building before the earthquake from the video data as a component of the horizontal vibration caused by the earthquake. . From the video data obtained by photographing the interlayer deformation of the building by the imaging unit provided in the first layer of the building composed of a plurality of layers, the interlayer deformation of the building indicated by the video data is converted into the first layer and the second layer. Converting to an inter-layer displacement between the layers;
A program for causing a computer to execute a step of extracting, from the video data, a signal component in a signal band determined according to a vibration characteristic of a building before the occurrence of an earthquake as a component of horizontal vibration caused by the earthquake.

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