JP5292036B2 - Fatigue damage monitoring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fatigue damage monitoring device for buildings which can easily perform integrity evaluation with high reliability and be designed in a small size. <P>SOLUTION: The fatigue damage monitoring device for buildings 10 can be attached to a building to be subjected to evaluation of fatigue damage, and includes: a displacement sensor 13 for measuring the displacement of the building; a storage part 14 for storing a fatigue damage value of the building; a calculation part 18a for calculating a fatigue damage value based on the displacement measured by the displacement sensor 13 and making the storage part 14 store the calculated fatigue damage value; and a transmitting/receiving part 15 for outputting the fatigue damage value stored in the storage part 14 to a fatigue damage evaluation device 20. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a fatigue damage monitoring apparatus for monitoring fatigue damage of a building.

  Conventionally, various apparatuses have been proposed for monitoring the health of various buildings (health monitoring). For example, a building state inspection system including a maximum value storage sensor installed at a predetermined position of a building and an RF sensor tag connected to the maximum value storage sensor has been proposed. In this system, displacement and strain are measured using a maximum value storage type sensor, and the RF sensor tag acquires these displacement and strain. In this RF sensor tag, the maximum value of the state quantity of the building and the state of the building at this time The soundness of the building was evaluated by comparing with the allowable value of the amount (see, for example, Patent Document 1. Especially, for the soundness evaluation method, refer to paragraph 0012).

  In addition, an acceleration sensor is installed in the building, and the acceleration measured by this sensor is converted into a zero cross point of acceleration, a maximum acceleration value, and an accumulated amplitude value by a CPU (Central Processing Unit) on the same substrate as the sensor, A system is disclosed that transmits each of these converted values to a master station via a relay station (see, for example, Non-Patent Document 1). Furthermore, according to the system described in Non-Patent Document 1, the amount of data transferred from the acceleration sensor to the external device is reduced by converting the measurement data into a damage index such as a maximum acceleration value inside the acceleration sensor. It is possible to do.

Japanese Patent Laid-Open No. 2005-207867 Yukihiro Tsuji, Jun Ikegaya, Mitsuru Nakamura, Takahito Yanase, “Development of Structural Health Monitoring System Using Smart Sensors and Wireless Networks”, Japan Earthquake Engineering Society Proceedings, Vol. 7, No. 6, 2007

  Here, in the soundness evaluation of a building, it is preferable to evaluate both sides of the building fatigue and damage. However, in the system described in Patent Document 1, since the soundness of the building is evaluated using only the maximum value of the state quantity of the building at the present time, the damage of the building can be evaluated to some extent, but the repeated stress It was not possible to evaluate the fatigue of buildings due to the above, and it was not possible to perform a soundness evaluation with high reliability.

  On the other hand, according to the system described in Non-Patent Document 1, since the soundness of the building was evaluated using the accumulated amplitude value in addition to the maximum acceleration value, the building fatigue should be evaluated to some extent. Is possible. However, in the system described in Non-Patent Document 1, the maximum acceleration value and the cumulative amplitude value are simply handled individually, and comprehensive evaluation that integrates fatigue and damage has not been performed. It was lacking.

  Further, in order to perform soundness evaluation with high reliability, it is preferable to shorten the sampling period of the sensor, and a large amount of data is acquired by the sensor. For this reason, as described in Non-Patent Document 1, it is necessary to secure a storage area for storing a large amount of data inside the acceleration sensor even if the conversion into the damage index is simply performed inside the acceleration sensor. There is no change in the occurrence, and in order to evaluate the soundness of the building over a long period of time, there is a problem that the acceleration sensor is enlarged.

  This invention is made | formed in view of the above, Comprising: It aims at providing the fatigue damage monitoring apparatus of a building which can perform highly reliable soundness evaluation with a simple and small apparatus.

In order to solve the above-described problems and achieve the object, a fatigue damage monitoring apparatus for a building according to claim 1 is an apparatus attached to a building to be evaluated for fatigue damage. Displacement measuring means for measuring displacement, time measuring means for obtaining a measurement time when displacement is measured by the displacement measuring means, fatigue damage value of the building, and displacement measured by the displacement measuring means Storage means for storing the measurement time acquired by the time measuring means, and a time history storage flag for specifying whether or not to store the displacement and the measurement time in association with each other, and The fatigue damage value is calculated based on the displacement measured by the displacement measuring means, the calculation means for storing the calculated fatigue damage value in the storage means, and the fatigue damage value stored in the storage means are predetermined. To an external device Output means, and the storage means includes at least a first storage area for storing the fatigue damage value, and a second storage area for storing the displacement and the measurement time in association with each other. The calculation means calculates at least the fatigue damage value based on the displacement measured by the displacement measurement means when the time history storage flag is stored in the storage means, and the calculated at least The fatigue damage value is stored in the first storage area, and the displacement measured by the displacement measuring means and the measurement time acquired by the time measuring means are associated with each other in the second memory. When the time history storage flag is not stored in the storage means, the fatigue damage value is calculated based on the displacement measured by the displacement measurement means, and the calculation is performed. The fatigue damage value is stored in the first storage area even without, and, wherein the calculated displacement used for fatigue damage value erased without stored in the second storage area, or the fatigue damage value The displacement used for the calculation is temporarily stored in the second storage area and then erased after the calculation of the fatigue damage value. The output means stores at least the fatigue damage value stored in the first storage area. Is output to the external device, or the displacement stored in the second storage area and the measurement time are output in association with each other.

The building fatigue damage monitoring apparatus according to claim 2 is the building fatigue damage monitoring apparatus according to claim 1, wherein the storage means further stores a threshold value of the fatigue damage value, and the output means Each time the fatigue damage value is calculated by the calculation means, the calculated fatigue damage value is compared with the threshold value, and when the fatigue damage value is higher than the threshold value, the external device transmits the fatigue damage value. The fatigue damage value is output to the external device regardless of whether or not a transmission request signal for requesting transmission of the fatigue damage value is received.
Further, the building fatigue damage monitoring apparatus according to claim 3 is the building fatigue damage monitoring apparatus according to claim 1 or 2, wherein the first storage area includes a displacement cumulative value, a displacement maximum value, and the like. The calculation means calculates the displacement cumulative value, the displacement maximum value, and the fatigue damage value based on the displacement measured by the displacement measurement means, and calculates the calculated displacement cumulative value, displacement A maximum value and a fatigue damage value are stored in the first storage area , and the output means stores the displacement cumulative value, the displacement maximum value, and the fatigue damage value stored in the first storage area in the external device. It is characterized by being output to.

The building fatigue damage monitoring apparatus according to claim 4 is the building fatigue damage monitoring apparatus according to any one of claims 1 to 3 , wherein the storage means is measured by the displacement measuring means. And further storing at least the displacement used for calculating the fatigue damage value, and the calculating means used for the calculation after calculating based on the displacement measured by the displacement measuring means. The displacement is erased from the storage means.

The building fatigue damage monitoring apparatus according to claim 5 is the building fatigue damage monitoring apparatus according to any one of claims 1 to 4 , wherein the output means is a wireless communication means. And

  According to the building fatigue damage monitoring apparatus according to claim 1, since the fatigue damage value is calculated and output to an external device, a comprehensive evaluation that integrates fatigue and damage is performed using the fatigue damage value. It becomes possible to improve the reliability of the soundness evaluation of the building.

According to the building fatigue damage monitoring apparatus of claim 2, since the fatigue damage value can be transmitted without waiting for the reception of the fatigue damage data transmission request signal, the soundness evaluation of the building is performed more quickly. be able to.
Moreover, according to the fatigue damage monitoring apparatus for a building of claim 3, in addition to the fatigue damage value, the displacement cumulative value and the maximum displacement value are calculated and output to the external device. It becomes possible to perform the soundness evaluation of the building using the accumulated displacement value and the maximum displacement value, and it is possible to perform the soundness evaluation with higher reliability.

Further, according to the fatigue damage monitoring apparatus for a building according to claim 4 , after performing the calculation based on the displacement measured by the displacement measuring means, the displacement used for the calculation is erased from the storage means. Since the storage capacity of the fatigue damage monitoring device can be reduced, the fatigue damage monitoring device can be reduced in size and cost, and the amount of data communication to external devices can be reduced, thereby reducing the power and time required for data communication. Can be reduced.

Moreover, according to the building fatigue damage monitoring apparatus according to claim 5 , since the output means is a wireless communication means, for example, after the fatigue damage monitoring apparatus is installed in the building to be evaluated, this fatigue damage monitoring is performed. Even if it is difficult to directly access the fatigue damage monitoring apparatus by covering the periphery of the apparatus with a finishing material or the like, the fatigue damage value or the like can be easily obtained.

Embodiment
Hereinafter, an embodiment of a building fatigue damage monitoring apparatus according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited by this embodiment.

(Constitution)
First, the configuration of the fatigue damage monitoring system according to the present embodiment will be described. FIG. 1 is an explanatory view schematically showing a fatigue damage monitoring system according to the present embodiment. The fatigue damage monitoring system 1 includes a fatigue damage monitoring device 10 and a fatigue damage evaluation device 20.

  The fatigue damage monitoring device 10 is attached to a building to be evaluated for fatigue damage, and performs from measurement to analysis of various data in the building. Although the specific kind of building is arbitrary, the fatigue damage monitoring apparatus 10 shall be attached to the damper 100 of this seismic isolation apparatus for the building provided with a seismic isolation apparatus here. In a building to which a seismic isolation device or a vibration damping device is attached in this manner, the load is concentrated on the damper 100 of the seismic isolation device or the vibration damping device. Therefore, fatigue damage of the damper 100 is monitored. By doing so, it is possible to reliably and efficiently evaluate the soundness of the building.

  On the other hand, the fatigue damage evaluation apparatus 20 evaluates the fatigue damage of a building based on various data output from the fatigue damage monitoring apparatus 10.

(Configuration-Fatigue damage monitoring device)
FIG. 2 is a block diagram functionally conceptually showing the fatigue damage monitoring apparatus 10 and the fatigue damage evaluation apparatus 20. The fatigue damage monitoring apparatus 10 includes a sensor module 11 and a data collection module 12. The sensor module 11 and the data collection module 12 are housed in the same casing and are electrically connected via an internal bus to constitute a smart sensor. However, the sensor module 11 and the data collection module 12 may be separated from each other and connected to each other by wire or wirelessly, and only the sensor module 11 may be attached to the damper 100.

(Configuration-Fatigue damage monitoring device-Sensor module)
First, the configuration of the sensor module 11 will be described. Specifically, the sensor module 11 includes a displacement sensor 13. The displacement sensor 13 is a displacement measuring means for measuring the displacement of the building (the travel distance of the damper 100 of the seismic isolation device). For example, a strain sensor, a contact displacement sensor, an ultrasonic displacement sensor, an optical displacement sensor, Alternatively, a potentiometer can be used. In the present embodiment, the acceleration due to the earthquake is calculated based on the displacement measured by the displacement sensor 13, but an acceleration sensor may be separately provided, or the sensor module 11 may include these distortions. In addition, a sensor for measuring a physical quantity other than acceleration may be added. For example, a temperature sensor may be provided.

(Configuration-Fatigue damage monitoring device-Data collection module)
Next, the configuration of the data collection module 12 will be described. The data collection module 12 includes a storage unit 14, a transmission / reception unit 15, a power supply unit 16, a timer unit 17, and a control unit 18.

  The storage unit 14 is a storage unit that stores various data such as a displacement measured by the sensor module 11, a displacement maximum value, and a fatigue damage value. The specific configuration thereof is arbitrary, but for example, a RAM (Random) Access Memory) or flash memory. Here, a first storage area and a second storage area are provided as storage areas of the storage unit 14, and fatigue damage data (accumulation displacement value, maximum displacement value, and fatigue damage value) is stored in the first storage area. The second storage area stores time history data (data in which the displacement is associated with the measurement time). In addition, the storage unit 14 stores identification information for uniquely identifying the fatigue damage monitoring device 10, a time history storage flag for specifying whether or not to store time history data, and a fatigue design curve. The identification information and the fatigue design curve are stored in advance in the storage unit 14 by an arbitrary method, and the time history storage flag is set in a time history storage start process described later.

  The transmission / reception unit 15 receives a transmission request signal from the fatigue damage evaluation apparatus 20 and transmits the data stored in the storage unit 14 to the fatigue damage evaluation apparatus 20, and the output means in claims Corresponding to Although this transmission / reception part 15 can also be comprised as a wired communication means which communicates by wire with the fatigue damage evaluation apparatus 20, here, in the environment where wired connection with the fatigue damage evaluation apparatus 20 is difficult Since transmission / reception is assumed to be performed remotely, the transmission / reception unit 15 is configured as wireless communication means for performing wireless communication. Although the specific configuration of the transmission / reception unit 15 as the wireless communication unit is arbitrary, for example, the transmission / reception unit 15 includes a transmission / reception conversion unit and an antenna (not shown).

  The power supply unit 16 is a power supply unit that supplies power to each unit of the data collection module 12. The power supply unit 16 may be configured as a power receiving / distributing unit that receives power from a commercial power source and distributes the power to each unit of the data collection module 12. Here, the fatigue damage monitoring apparatus 10 is used in an environment where no commercial power source exists. Therefore, for example, a button-type lithium battery is employed as the power supply unit 16.

  The time measuring unit 17 is a time measuring unit that acquires current time information by a known method and outputs it to the control unit 18.

  The control unit 18 is a control unit that controls each unit of the data collection module 12, and includes, for example, a CPU and various programs that are analyzed and executed on the CPU (the same applies to the control unit 25). The control unit 18 includes a calculation unit 18a in terms of functional concept. The calculation unit 18a corresponds to the calculation means in the claims, and its specific function will be described later. The calculation unit 18a is configured by installing a fatigue damage monitoring program in the data collection module 12 via a network or an arbitrary storage medium.

(Configuration-Fatigue damage evaluation device)
Next, the configuration of the fatigue damage evaluation apparatus 20 will be described. As shown in FIG. 2, the fatigue damage evaluation apparatus 20 includes an input unit 21, an output unit 22, a storage unit 23, a transmission / reception unit 24, and a control unit 25.

  The input unit 21 is an input unit for inputting arbitrary information to the fatigue damage evaluation apparatus 20, and is configured by, for example, a keyboard or a mouse (not shown).

  The output unit 22 is an output unit for outputting arbitrary information from the fatigue damage evaluation apparatus 20, and is configured by a display or a speaker (not shown), for example.

  The storage unit 23 is a storage unit that stores data transmitted from the data collection module 12, and its specific configuration is arbitrary, but is configured using a non-volatile storage medium such as HD (Hard Disk), for example. .

  The transmission / reception unit 24 is a transmission / reception unit that transmits a transmission request signal to the data collection module 12 and receives data transmitted from the fatigue damage evaluation apparatus 20. Similar to the transmission / reception unit 15 of the data collection module 12, the transmission / reception unit 24 can be configured as a wired communication unit that performs wired communication, but here is configured as a wireless communication unit that performs wireless communication. For example, a transmission / reception conversion unit and an antenna (not shown) are provided.

  The control unit 25 is a control unit that controls each unit of the fatigue damage evaluation apparatus 20. The control unit 25 includes a soundness evaluation unit 25a in terms of functional concept. Specific functions of the soundness evaluation unit 25a will be described later. The soundness evaluation unit 25a is configured by installing a soundness evaluation program in the fatigue damage evaluation apparatus 20 via a network or an arbitrary storage medium. The data collection module 12 can actually be configured using a known personal computer.

(processing)
Next, the fatigue damage monitoring process in the fatigue damage monitoring system 1 configured as described above will be described. This fatigue damage monitoring process is roughly divided into a reset process, a time history storage start process, a fatigue damage data acquisition process, a fatigue damage data transmission request process, and a time history data transmission request process.

(Processing-Reset processing)
First, the reset process will be described. This reset process is a process performed after the installation of the fatigue damage monitoring apparatus 10 and is a process of resetting (initializing) the fatigue damage monitoring apparatus 10 according to an instruction from the fatigue damage evaluation apparatus 20. A flowchart of the reset process is shown in FIG. The administrator places the fatigue damage evaluation device 20 within the communication range with respect to the fatigue damage monitoring device 10 (the same applies to other processes thereafter), and instructs the reset by a predetermined method via the input unit 21. The control unit 25 of the fatigue damage evaluation apparatus 20 wirelessly transmits a reset signal in a predetermined format to the fatigue damage monitoring apparatus 10 via the transmission / reception unit 24 (SA1). This reset signal includes identification information of the fatigue damage monitoring device 10 to be reset and time data indicating the current time. For example, the identification information may be input by the administrator via the input unit 21, or the desired identification information is managed from the identification information of each fatigue damage monitoring apparatus 10 stored in advance in the storage unit 23. The user may make a selection via the input unit 21 (the same applies to other processes thereafter). The time data can be acquired from an internal clock (not shown) of the fatigue damage evaluation apparatus 20.

  When the control unit 18 of the fatigue damage monitoring apparatus 10 receives the reset signal via the transmission / reception unit 15 (SA2, Yes), does the identification information included in the reset signal match the identification information stored in the storage unit 14? If it does not match (SA3, No), the reset process is terminated without performing any processing, and if it matches (SA3, Yes), the first storage in the storage unit 14 After clearing the area and the second storage area and correcting the time of the time measuring unit 17 based on the time data included in the reset signal (SA4), the reset in a predetermined format including the identification information stored in the storage unit 14 A completion signal is transmitted via the transmission / reception unit 15 (SA5).

  The control unit 25 of the fatigue damage evaluation apparatus 20 confirms reception of the reset completion signal including the same identification information as that included in the reset signal (SA6), and even if a predetermined time or more has elapsed from the transmission of the reset signal, When the reset completion signal is not received (SA6, No) (SA7, Yes), an error is output via the output unit 22 (SA8), thereby notifying the administrator of the occurrence of an abnormality. On the other hand, when the reset completion signal is received via the transmission / reception unit 24 before the predetermined time or more has elapsed (SA6, Yes), the reset process is terminated.

(Processing-Time history storage start processing)
Next, the time history storage start process will be described. This time history storage start process is a process for starting the storage of time history data in the fatigue damage monitoring apparatus 10 according to an instruction from the fatigue damage evaluation apparatus 20. FIG. 4 shows a flowchart of the time history storage start process. The administrator instructs to start storing time history data by a predetermined method via the input unit 21 of the fatigue damage evaluation apparatus 20. The control unit 25 of the fatigue damage evaluation apparatus 20 wirelessly transmits a time history storage request signal in a predetermined format to the fatigue damage monitoring apparatus 10 via the transmission / reception unit 24 (SB1). This time history storage request signal includes the identification information of the fatigue damage monitoring apparatus 10 that is the target of the start of storing the time history data, as in the reset process.

  When the control unit 18 of the fatigue damage monitoring apparatus 10 receives the time history storage request signal via the transmission / reception unit 15 (SB2, Yes), after confirming the match of the identification information as in the reset process (SB3), the time history It is determined whether or not the storage flag has already been set in the storage unit 14 (SB4). If it has already been set (SB4, Yes), the reset process is terminated without performing any processing, and it is still set. If not (SB4, No), the second storage area of the storage unit 14 is cleared and the header information is stored in this second storage area (SB5). As this header information, for example, the current time acquired from the time measuring unit 17 can be included as the storage start time of the time history data, or the sampling interval ΔT of the time history data can be included. Next, the control unit 18 sets a time history storage flag in the storage unit 14 (SB6), and sends a predetermined format of time history storage start completion signal including the identification information stored in the storage unit 14 via the transmission / reception unit 15. Make a call (SB7).

  The control unit 25 of the fatigue damage evaluation apparatus 20 confirms reception of the time history storage start completion signal including the same identification information as that included in the time history storage request signal (SB8), and transmits the time history storage request signal. If the time history storage start completion signal is not received even after a predetermined time has elapsed (SB8, No) (SB9, Yes), error output is performed via the output unit 22 (SB10). Inform the person of the occurrence of abnormality. On the other hand, when the time history storage start completion signal is received via the transmission / reception unit 24 before the predetermined time or more has elapsed (SB8, Yes), the time history storage start process is terminated.

(Processing-Fatigue damage data acquisition process)
Next, the fatigue damage data acquisition process will be described. This fatigue damage data acquisition process is a process of collecting and calculating various data in the fatigue damage monitoring apparatus 10. A flowchart of this fatigue damage data acquisition processing is shown in FIG. In this process, fatigue damage data is stored by interruption processing at a predetermined sampling interval T (for example, 100 Hz or 200 Hz), and time history data is stored by interruption processing at a predetermined sampling interval ΔT (<T). However, the storage of time history data is executed only when the time history storage flag is set in the storage unit 14 by the above-described time history storage start process.

  Specifically, the calculation unit 18a monitors whether the sampling interval ΔT has arrived (SC1), and when the sampling interval ΔT has arrived (SC1, Yes), the output value from the displacement sensor 13 of the sensor module 11 (For example, a 16-bit voltage value) is acquired (SC2). Next, the calculation unit 18a determines whether or not the time history storage flag is set in the storage unit 14 (SC3), and when it is not set (SC3, No), based on the output value acquired in SC2. The fatigue damage data is calculated by a predetermined method (SC4).

  For example, the calculation unit 18a multiplies the output value from the displacement sensor 13 by a predetermined calibration value, thereby converting the output value into a physical quantity (that is, the travel distance of the damper 100 of the seismic isolation device = displacement) to obtain the displacement. . Further, the calculation unit 18a updates the displacement accumulated value by adding the acquired displacement to the displacement accumulated value stored in the first storage area of the storage unit 14 at that time (first processing). Then, the acquired displacement is used as a cumulative displacement value). Further, the calculating unit 18a compares the acquired displacement with the maximum displacement value stored in the first storage area at that time, and when the acquired displacement is larger than the maximum displacement value, the acquired displacement The displacement maximum value is updated by overwriting the displacement maximum value with. As the maximum displacement value, the maximum value on the positive side and the maximum value on the negative side are acquired with reference to zero displacement.

Furthermore, the calculation unit 18a calculates a fatigue damage value based on the acquired displacement. Here, the fatigue damage value is a comprehensive evaluation index that integrates fatigue and damage to be evaluated, and is calculated by, for example, a minor rule (cumulative damage rule: Miner's Rule). The minor rule is one of the methods for evaluating fatigue damage of a metal member. Based on the result of a fatigue test under a repeated load having a constant amplitude, the minor rule is applied to the strain amplitude and damage of the evaluation target (here, the damper 100). In this method, a fatigue curve indicating the relationship with the number of applied forces is obtained in advance, and cumulative fatigue damage with respect to the actually generated fluctuation strain amplitude is evaluated using this fatigue curve. For example, when the cyclic strain amplitude ε and the fatigue life number N at which the evaluation target is damaged are used, the fatigue design curve is expressed as shown in FIG. 6, and this relational expression is b = log (ε + N ^a ). Here, ε ₀ in FIG. 6 is the lower limit value of the strain amplitude that contributes to fatigue damage, and indicates that there is no need for fatigue verification for strain amplitudes less than or equal to this lower limit value. Further, fatigue damage value D, the number of repetitions n _i of each strain amplitude epsilon _i is calculated by accumulating the following equation. Here, N _i is the number of fatigue lives at the strain amplitude ε _i .
D = Σ (n _i / N _i ) (1)

More specifically, calculation unit 18a, and obtains the displacement based on the output value from the displacement sensor 13, determines whether or not than the lower limit value epsilon ₀ of the strain amplitude is predetermined, lower value epsilon _When it is ₀ or less, the fatigue damage value based on the acquired displacement is not calculated, and when the lower limit ε ₀ is exceeded, the fatigue damage value is calculated based on the acquired displacement. In this calculation or update, n _i / N _i in equation (1) is calculated based on the acquired displacement (strain amplitude in the minor law) and the fatigue design curve stored in advance in the storage unit 14, The fatigue damage value D in the equation (1) is calculated by accumulating n _i / N _i every time SC4 is repeated. Here, when storing the fatigue damage data in the first storage area of the storage unit 14, the calculation unit 18 a acquires the fatigue damage data based on the output value from the displacement sensor 13 used for the calculation of the fatigue damage data or the output value. The displacement is erased without being stored in the storage unit 14 (or is erased after calculation of fatigue damage data after being temporarily stored).

The calculating unit 18a stores the various fatigue damage data calculated as described above in the first storage area of the storage unit 14 (SC6). However, since the fatigue damage data is stored at the sampling interval T here, the calculation unit 18a determines whether or not the sampling interval T has arrived (SC5), and only when the sampling interval T has arrived (SC5). , Yes), the fatigue damage data is stored. Thereafter, these SC1 to SC6 are repeated, and fatigue damage data is stored in the first storage area of the storage unit 14 every time the sampling interval T arrives.

  The fatigue damage data is stored in order from the first record in the first storage area, and after the storage in the last record in the first storage area is completed, the process returns to the first record again to perform overwriting. Also, predetermined header information can be added to the first storage area, and this header information can be updated as necessary every time SC6 is performed. The header information may include, for example, the address of the record in which the last fatigue damage data is stored at that time, the time when the last fatigue damage data is stored, and the identification information stored in the storage unit 14. it can. The address of the record in which the fatigue damage data is finally stored is referred to in order to specify the storage position when the fatigue damage data is stored next time. As the time when the last fatigue damage data is stored, the time acquired from the time measuring unit 17 is stored. The identification information is referred to when the fatigue damage evaluation apparatus 20 specifies the acquisition source of the fatigue damage data.

  On the other hand, when determining that the time history storage flag is set in SC3 of FIG. 5 (SC3, Yes), the calculation unit 18a stores the time history data in the second storage area of the storage unit 14 (SC7). Specifically, similarly to SC4, the displacement acquired based on the output value from the displacement sensor 13 and the current time acquired from the timer unit 17 are stored in the second storage area in association with each other. This storage is performed from the top of the second storage area. When the second storage area is full (SC8, Yes), the time history storage flag of the storage unit 14 is set without overwriting the time history data. By turning it off, the subsequent storage of time history data is stopped (SC9) and the process proceeds to SC4.

(Processing-Fatigue damage data transmission request processing)
Next, fatigue damage data transmission request processing will be described. This fatigue damage data transmission request process is a process of transmitting fatigue damage data from the fatigue damage monitoring apparatus 10 to the fatigue damage evaluation apparatus 20. A flowchart of the fatigue damage data transmission request process is shown in FIG. The manager instructs transmission of fatigue damage data by a predetermined method via the input unit 21 of the fatigue damage evaluation apparatus 20. The control unit 25 of the fatigue damage evaluation apparatus 20 wirelessly transmits a fatigue damage data transmission request signal in a predetermined format to the fatigue damage monitoring apparatus 10 via the transmission / reception unit 24 (SD1). The fatigue damage data transmission request signal includes the identification information of the fatigue damage monitoring apparatus 10 that is the subject of the fatigue damage data transmission request.

  When the control unit 18 of the fatigue damage monitoring apparatus 10 receives the fatigue damage data transmission request signal via the transmission / reception unit 15 (SD2, Yes), after confirming the match of the identification information as in the reset process (SD3, Yes) The fatigue damage data signal including all fatigue damage data and header information stored in the first storage area of the storage unit 14 at that time is transmitted to the fatigue damage evaluation apparatus 20 via the transmission / reception unit 15 (SD4). ).

  The control unit 25 of the fatigue damage evaluation apparatus 20 confirms reception of the fatigue damage data signal including the same identification information as that included in the fatigue damage data transmission request signal (SD5), and transmits the fatigue damage data transmission request signal. If the fatigue damage data signal is not received even after a predetermined time has elapsed (SD5, No) (SD6, Yes), error output is performed via the output unit 22 (SD7). Notify the occurrence of abnormality. On the other hand, when the fatigue damage data signal is received via the transmission / reception unit 24 before the predetermined time or more has elapsed (SD5, Yes), the control unit 25 stores the fatigue damage data and header information included in the fatigue damage data signal. The fatigue damage data is output to the soundness evaluation unit 25a while being stored in the unit 23.

  The soundness evaluation unit 25a evaluates the soundness of the building based on the fatigue damage data (SD8). For example, when the cumulative displacement value or the maximum displacement value is compared with a threshold value stored in advance in the storage unit 23 and the cumulative displacement value or the maximum displacement value exceeds the threshold value, the soundness of the building is impaired. (Fatigue is determined based on the accumulated displacement value, and damage is determined based on the maximum displacement value). Alternatively, the fatigue damage value is compared with a reference value (= 1) indicating the life of the building in the minor rule, and if the fatigue damage value is within a predetermined range with respect to the reference value, the soundness of the building is Judge as damaged. And when the soundness evaluation part 25a determines with the soundness of the building being impaired (SD9, Yes), the predetermined warning output to the effect that soundness is impaired is performed via the output part 22. This is notified to the administrator (SD10).

(Processing-Time history data transmission request processing)
Finally, the time history data transmission request process will be described. This time history data transmission request processing is processing for transmitting time history data from the fatigue damage monitoring device 10 to the fatigue damage evaluation device 20. A flowchart of this time history data transmission request process is shown in FIG. However, SE1 to SE7 in this process replace “fatigue damage data” with “time history data” and “first storage area” as “second storage area” in the description of SD1 to SD7 in FIG. The explanation is omitted because it is the same as that replaced with. When the time history data signal is received via the transmission / reception unit 24 before the predetermined time or more has elapsed (SE5, Yes), the control unit 25 stores the time history data and header information included in the time history data signal in the storage unit 23. (SE8). The time history data and the like stored in this way are referred to, for example, when the manager confirms the progress state of damage to the soundness of the building.

(effect)
As described above, according to the fatigue damage monitoring apparatus 10 according to the present embodiment, since the fatigue damage value is calculated and output to the fatigue damage evaluation apparatus 20, the fatigue damage value is used to integrate the fatigue and damage. Evaluation can be performed, and the reliability of building soundness evaluation can be improved.

  Further, in addition to the fatigue damage value, the cumulative displacement value and the maximum displacement value are calculated and output to the fatigue damage evaluation apparatus 20, so that the soundness of the building is obtained using the cumulative displacement value and the maximum displacement value in conjunction with the fatigue damage value. It becomes possible to perform a property evaluation, and it becomes possible to perform a soundness evaluation with higher reliability.

  In addition, after the calculation based on the displacement measured by the displacement sensor 13 is performed, the displacement used for the calculation is deleted from the storage unit 14 of the fatigue damage monitoring device 10, and thus the storage unit 14 of the fatigue damage monitoring device 10 is deleted. Since the storage capacity can be reduced, the fatigue damage monitoring device 10 can be reduced in size and cost, and the amount of data communication to the fatigue damage evaluation device 20 can be reduced, thereby reducing the power and time required for data communication. Can be reduced.

  Further, since the transmitter / receiver 15 is a wireless communication means, for example, after the fatigue damage monitoring apparatus 10 is installed in a building to be evaluated, the fatigue damage monitoring apparatus 10 is covered with a finishing material or the like to cover the fatigue damage monitoring apparatus 10. Even when direct access to the monitoring device 10 becomes difficult, it becomes possible to easily obtain fatigue damage values and the like.

[Modifications to Embodiment]
Although one embodiment of the present invention has been described above, specific configurations and means of the present invention are arbitrarily modified and improved within the scope of the technical idea of each invention described in the claims. be able to. Hereinafter, such a modification will be described.

(About problems to be solved and effects of the invention)
First, the problems to be solved by the invention and the effects of the invention are not limited to the above-described contents, and the present invention solves the problems not described above or has the effects not described above. There are also cases where only some of the described problems are solved or only some of the described effects are achieved.

(About data collection trigger)
In the above embodiment, fatigue damage data and time history data are stored in the storage unit 14 based on a predetermined sampling interval, but may be stored based on other triggers. For example, when a shake due to an earthquake is detected, fatigue damage data may be stored in the storage unit 14 only for a predetermined time (for example, several minutes). In this case, the storage capacity of the storage unit 14 is further reduced. it can. For shaking due to an earthquake, an earthquake sensor may be added to the sensor module 11, but the acceleration is calculated by differentiating the displacement calculated based on the output from the displacement sensor 13, and the earthquake is calculated based on the calculated acceleration. In this case, it is preferable in that the number of sensors can be reduced.

(About data output trigger)
In the above embodiment, when a fatigue damage data transmission request signal is received or when a time history data request signal is received, fatigue damage data and time history data are transmitted from the fatigue damage monitoring device 10 to the fatigue damage evaluation device 20. However, transmission may be performed based on another trigger. For example, when the fatigue damage value is stored in advance in the storage unit 14 and the fatigue damage value is calculated, the calculated fatigue damage value is compared with the threshold value, and when the fatigue damage value exceeds the threshold value, The fatigue damage monitoring apparatus 10 may actively transmit the fatigue damage value. In this case, since the fatigue damage value can be transmitted without waiting for the reception of the fatigue damage data transmission request signal, the soundness evaluation of the building can be performed more quickly.

It is explanatory drawing which shows typically the fatigue damage monitoring system which concerns on embodiment of this invention. It is a block diagram which shows a fatigue damage monitoring apparatus and a fatigue damage evaluation apparatus functionally conceptually. It is a flowchart of a reset process. It is a flowchart of a time history storage start process. It is a flowchart of a fatigue damage data acquisition process. It is a figure which shows a fatigue design curve. It is a flowchart of a fatigue damage data transmission request process. It is a flowchart of a time history data transmission request process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fatigue damage monitoring system 10 Fatigue damage monitoring apparatus 11 Sensor module 12 Data collection module 13 Displacement sensor 14, 23 Memory | storage part 15, 24 Transmission / reception part 16 Power supply part 17 Time measuring part 18, 25 Control part 18a Calculation part 20 Fatigue damage evaluation apparatus 21 Input unit 22 Output unit 25a Soundness evaluation unit 100 Damper

Claims (5)

A device that can be attached to a building to be evaluated for fatigue damage,
Displacement measuring means for measuring the displacement of the building;
Time measuring means for obtaining a measurement time when displacement is measured by the displacement measuring means;
It is necessary to store the fatigue damage value of the building, the displacement measured by the displacement measuring unit, the measurement time acquired by the time measuring unit, and the displacement and the measurement time in association with each other. Storage means for storing a time history storage flag for specifying whether or not,
Calculating the fatigue damage value based on the displacement measured by the displacement measuring means, and calculating means for storing the calculated fatigue damage value in the storage means;
Output means for outputting the fatigue damage value stored in the storage means to a predetermined external device, and
The storage means
A first storage area for storing at least the fatigue damage value;
A second storage area for storing the displacement and the measurement time in association with each other;
The calculating means is
When the time history storage flag is stored in the storage means, at least the fatigue damage value is calculated based on the displacement measured by the displacement measurement means, and the calculated at least the fatigue damage value is Storing the first storage area in the second storage area in association with the displacement measured by the displacement measuring means and the measurement time acquired by the time measuring means,
When the time history storage flag is not stored in the storage means, at least the fatigue damage value is calculated based on the displacement measured by the displacement measurement means, and the calculated at least the fatigue damage value is The displacement used for calculation of the fatigue damage value is erased without being stored in the second storage area and stored in the first storage area and the displacement used for calculation of the fatigue damage value is stored in the second storage area. Erasing after calculating the fatigue damage value after temporarily storing in the second storage area,
The output means includes
Outputting at least the fatigue damage value stored in the first storage area to the external device, or outputting the displacement stored in the second storage area and the measurement time in association with each other. ,
Fatigue damage monitoring device for buildings. The storage means further stores a threshold value of the fatigue damage value,
The output means compares the calculated fatigue damage value with the threshold value every time the fatigue damage value is calculated by the calculating means, and when the fatigue damage value is higher than the threshold value, A transmission request signal transmitted from an external device, regardless of whether or not a transmission request signal for requesting transmission of the fatigue damage value is received, outputting the fatigue damage value to the external device;
The building fatigue damage monitoring apparatus according to claim 1, wherein: The first storage area further stores a displacement cumulative value and a displacement maximum value,
The calculating means calculates the displacement cumulative value, the displacement maximum value, and the fatigue damage value based on the displacement measured by the displacement measuring means, and calculates the calculated displacement cumulative value, displacement maximum value, and fatigue. Storing a damage value in the first storage area;
The output means outputs the accumulated displacement value, the displacement maximum value, and the fatigue damage value stored in the first storage area to the external device;
The building fatigue monitoring apparatus according to claim 1 or 2, wherein The storage means is a displacement measured by the displacement measurement means, and further stores at least a displacement used for calculation of the fatigue damage value,
The calculating means, after performing a calculation based on the displacement measured by the displacement measuring means, erasing the displacement used for the calculation from the storage means;
The apparatus for monitoring fatigue damage of buildings according to any one of claims 1 to 3, wherein: The output means is a wireless communication means;
The apparatus for monitoring fatigue damage of buildings according to any one of claims 1 to 4, wherein:

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