Remaining lifetime estimation method and remaining lifetime estimation device

Abstract

To provide a remaining lifetime estimation method and a remaining lifetime estimation device capable of accurately estimating the remaining lifetime of a bridge that undergoes aging deterioration due to vehicle passage.SOLUTION: A remaining lifetime estimation method for estimating the remaining lifetime of a bridge comprises: a secular change information acquisition step of acquiring, through analysis, secular change information indicating the secular change in dynamic deflection of the bridge over years elapsed of the use of the bridge; a dynamic deflection acquisition step of acquiring a measured value of the dynamic deflection of the bridge; and a remaining lifetime calculation step of calculating the remaining lifetime of the bridge by specifying the actual number of years of the years elapsed of the use in the secular change information from the measured value of the dynamic deflection.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a remaining life estimation method and a remaining life estimation device for estimating the remaining life of a bridge. [Background technology]

[0002] Conventionally, prediction of the progress of bridge soundness over time has been performed using statistical methods that use visual inspection results, etc. For example, Patent Document 1 discloses a method of evaluating the soundness of a bridge using the dimensionless stiffness ratio of the concrete deck of the bridge. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3836310 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional technology predicts the progress of bridge soundness based on visual inspections, so it can be used to estimate when repairs are necessary, but it cannot quantitatively evaluate the remaining lifespan of a bridge as the period during which the bridge's mechanical performance can be maintained. As the remaining lifespan of a bridge cannot be quantitatively evaluated, there is a problem that the safety of the bridge as a whole is unclear if the remaining lifespan of the bridge is unknown even if repairs are carried out based on the bridge's soundness. In addition, if the remaining lifespan of a bridge is estimated to be unreasonably short, there is a risk that excessive costs will be incurred for repairing or rebuilding the bridge.

[0005] In consideration of the above-mentioned circumstances, at least one embodiment of the present disclosure aims to provide a remaining life estimation method and a remaining life estimation device that can accurately estimate the remaining life of a bridge that is subject to deterioration over time due to the passage of vehicles. [Means for solving the problem]

[0006] A remaining life estimation method according to at least one embodiment of the present disclosure includes: A remaining life estimation method for estimating a remaining life of a bridge, comprising: an aging information acquisition step of acquiring, by analysis, aging information indicating an aging change in dynamic deflection of the bridge with respect to the number of years since the bridge has been in use; A dynamic deflection acquisition step of acquiring an actual measured value of dynamic deflection of the bridge; and a remaining life calculation step of calculating a remaining life of the bridge by identifying the actual number of years of use in the aging information from the actual measurement value of the dynamic deflection.

[0007] A remaining life estimation device according to at least one embodiment of the present disclosure includes: A remaining life estimation device for estimating the remaining life of a bridge, comprising: an aging information acquisition unit configured to acquire, by analysis, aging information indicating an aging change in dynamic deflection of the bridge with respect to the number of years since the bridge was used; A dynamic deflection acquisition unit configured to acquire an actual measured value of dynamic deflection of the bridge; and a remaining life calculation unit configured to calculate a remaining life of the bridge by identifying the actual number of years of use in the aging information from the actual measurement value of the dynamic deflection. Effect of the Invention

[0008] According to at least one embodiment of the present disclosure, there is provided a remaining life estimation method and a remaining life estimation device capable of accurately estimating the remaining life of a bridge that is subject to deterioration over time due to the passage of vehicles. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a flow diagram of a remaining life estimation method according to an embodiment of the present disclosure. [Diagram 2] 1 is a schematic diagram of a remaining life estimation system including a remaining life estimation device according to an embodiment of the present disclosure. [Diagram 3] FIG. 1 is a schematic diagram of a remaining life estimation device and a dynamic deflection measurement device according to an embodiment of the present disclosure. [Figure 4]FIG. 2 is an explanatory diagram for explaining a remaining life estimation method according to an embodiment of the present disclosure. [Diagram 5] FIG. 2 is an explanatory diagram for explaining a remaining life estimation method according to an embodiment of the present disclosure. [Figure 6] FIG. 2 is an explanatory diagram for explaining a remaining life estimation method according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as the embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present disclosure.

[0011] (Remaining life estimation method) Fig. 1 is a flow diagram of a remaining life estimation method according to an embodiment of the present disclosure. Fig. 2 is a schematic diagram of a remaining life estimation system 10 including a remaining life estimation device 1 according to an embodiment of the present disclosure. The remaining life estimation device 1 and the remaining life estimation method are for estimating the remaining life RL of a bridge 2 (device, method). As shown in Fig. 1, the remaining life estimation method according to some embodiments includes an aging information acquisition step S1, a dynamic deflection acquisition step S2, and a remaining life calculation step S3.

[0012] (Remaining life estimation device) 3 is a schematic diagram of a remaining life estimation device 1 and a dynamic deflection measurement device 3 according to an embodiment of the present disclosure. In some embodiments, the remaining life estimation method is performed by the remaining life estimation device 1. As shown in FIG. 3, the remaining life estimation device 1 includes an aging information acquisition unit 11, a dynamic deflection acquisition unit 12, and a remaining life calculation unit 13.

[0013] In the illustrated embodiment, the remaining life estimation device 1 includes an electronic control unit 100 for estimating the remaining life RL of the bridge 2. As shown in Fig. 3, the remaining life estimation device 1 may be configured as a microcomputer including an input device 101 (input interface), an output device 102 (output interface), a storage device 103 (memories such as ROM and RAM, external storage device, etc.), and a calculation device 104 (CPU). The electronic control unit 100 may realize each operation of the remaining life estimation device 1 (for example, the aging information acquisition unit 11, the dynamic deflection acquisition unit 12, the remaining life calculation unit 13, the correction unit 14 described later, etc.) by the CPU operating (for example, calculating data, etc.) according to instructions of a program loaded into a main storage device of the memory.

[0014] In the illustrated embodiment, the remaining life estimation device 1 is configured so that the output from the dynamic deflection measuring device 3 is input to a storage device 103 and an arithmetic device 104 via an input device 101. The storage device 103 is configured to store the output from the dynamic deflection measuring device 3. The arithmetic device 104 is configured to execute various controls in accordance with the control programs stored in the storage device 103.

[0015] (Bridges) As shown in Fig. 2, the bridge 2 includes a superstructure 21 having a floor surface 23 on which vehicles 4 can pass, and a substructure 22 that supports the superstructure 21. In the illustrated embodiment, the floor surface 23 has a longitudinal direction along the length direction of the bridge 2 (left-right direction in Fig. 2) and a lateral direction along the width direction of the bridge 2 (perpendicular to the paper surface in Fig. 2).

[0016] In the illustrated embodiment, the superstructure 21 includes a main girder 24, a deck 25 laid on the main girder 24, and a pavement 26 laminated on the deck 25. The main girder 24 has a longitudinal direction along the length of the bridge 2. The pavement 26 is made of, for example, asphalt, and has the above-mentioned floor surface 23 on its surface (upper surface).

[0017] In the illustrated embodiment, the substructure 22 includes a pair of abutments 27 that support both longitudinal ends of the main girder 24 constituting the superstructure 21 via bearings, and at least one (in the illustrated example, multiple) piers 28 that are disposed between the pair of abutments 27 and support the main girder 24 via bearings. The multiple piers 28 are disposed at intervals from the abutments 27 and the other piers 28 in the longitudinal direction of the bridge 2. The remaining life estimation device and remaining life estimation method disclosed herein can also be applied to a bridge 2 that does not include a pier 28.

[0018] When a vehicle 4 travels on the deck 23 of the bridge 2, the load (repeated load) of the vehicle 4 acts on the superstructure 21 of the bridge 2, causing dynamic deflection in the superstructure 21. As the bridge 2 ages, the dynamic deflection generated in the superstructure 21 tends to increase.

[0019] (Aging information acquisition step) In the aging information acquisition step S1, aging information A is acquired by analysis. The aging information A is information indicating the aging of the dynamic deflection D of the bridge 2 relative to the number of years T since the bridge 2 was used. In one embodiment, the aging information acquisition step S1 is performed by an aging information acquisition unit 11. The aging information acquisition unit 11 is configured to acquire the aging information A by analysis.

[0020] The aging information A indicates the correspondence relationship between the number of years T since the bridge 2 was used and the dynamic deflection D of the bridge 2. The aging information A includes a list, table, map, function, machine learning model, etc., indicating the correspondence relationship between the number of years T since the bridge 2 was used and the dynamic deflection D.

[0021] 4 to 6 are explanatory diagrams for explaining a remaining life estimation method according to an embodiment of the present disclosure. In FIG. 4 to FIG. 6, a graph is shown with the number of years T of the bridge 2 used as the horizontal axis and the dynamic deflection D of the bridge 2 as the vertical axis, and this graph shows a deterioration curve C indicating the aging of the dynamic deflection D of the bridge 2 with respect to the number of years T of the bridge 2 used obtained from the aging information A. The deterioration curve C includes a destruction point BP which is the end point of the deterioration curve C. The destruction point BP is an extreme point at which the bridge 2 is destroyed. At the destruction point BP, the dynamic deflection D of the bridge 2 is a limit deflection (limit value) LD, and when the dynamic deflection D of the bridge 2 reaches the limit deflection LD, there is a high probability that the bridge 2 will be destroyed. The above-mentioned aging information A may be information from which the deterioration curve C including the destruction point BP can be obtained.

[0022] The aging information A is stored in the storage device 103 prior to the aging information acquisition step S1. The aging information acquisition unit 11 may acquire the aging information A stored in the storage device 103.

[0023] (Dynamic deflection acquisition step) In the dynamic deflection acquisition step S2, an actual measured value DM of the dynamic deflection D of the bridge 2 is acquired. In one embodiment, the dynamic deflection acquisition step S2 is performed by a dynamic deflection acquisition unit 12. The dynamic deflection acquisition unit 12 is configured to acquire the actual measured value DM of the dynamic deflection D of the bridge 2. In the illustrated embodiment, the remaining life estimation system 10 includes the above-mentioned remaining life estimation device 1 and a dynamic deflection measuring device 3 configured to measure the dynamic deflection D of the bridge 2.

[0024] In the illustrated embodiment, the dynamic deflection measuring device 3 is disposed on the floor surface 23 in the span center portion 29 of the bridge 2 as shown in FIG. 2. The dynamic deflection measuring device 3 may be disposed on a guardrail or the like of the bridge 2. The span center portion 29 of the bridge 2 is the center portion of the span length SL, which is the length between two adjacent bearing portions in the longitudinal direction of the bridge 2. Each of the two bearing portions is provided between either the abutment 27 or the pier 28 and the main girder 24. The dynamic deflection measuring device 3 is preferably disposed on the floor surface 23 in the center portion between the two bearing portions having the maximum span length of the bridge 2. Note that the dynamic deflection measuring device 3 may be disposed in each of a plurality of span centers 29 present in the bridge 2, and the dynamic deflection D in each of the plurality of span centers 29 may be acquired.

[0025] In the illustrated embodiment, as shown in Fig. 2, the dynamic deflection measuring device 3 acquires (the maximum value of) dynamic deflection D of the span center 29 of the bridge 2 due to the live load when a vehicle 4 of a predetermined weight (predetermined total vehicle weight) runs across the bridge 2. The vehicle 4 of the predetermined weight refers to a vehicle whose total vehicle weight is a predetermined mass weight.

[0026] 3, the dynamic deflection measuring device 3 includes an acceleration sensor 31 configured to measure the acceleration when a vehicle 4 of a predetermined weight travels across the bridge 2, and an integrator 32 configured to calculate the dynamic deflection D when a vehicle 4 of a predetermined weight travels across the bridge 2 by performing second-order integration on the time-series data of the acceleration measured by the acceleration sensor 31. Note that the dynamic deflection measuring device 3 is not limited to a configuration including the acceleration sensor 31 and the integrator 32 as long as it is capable of acquiring the dynamic deflection D.

[0027] The remaining life estimation device 1 is connected to the dynamic deflection measuring device 3, and is configured to be able to transmit information about the dynamic deflection D from the dynamic deflection measuring device 3. In the present disclosure, "configured to be able to transmit" means that the information about the dynamic deflection D can be transmitted, and may be configured to be able to communicate via a network line or to transfer data via a storage medium such as an SD card, for example. In the illustrated embodiment, each of the remaining life estimation device 1 and the dynamic deflection measuring device 3 has an interface for transmitting information. The remaining life estimation device 1 includes a receiver 101A in the input device 101, and the dynamic deflection measuring device 3 includes a transmitter 33 capable of transmitting to the receiver 101A. The remaining life estimation device 1 and the dynamic deflection measuring device 3 are connected to a communication network CN such as a LAN or a WAN, and the actual measured value DM of the dynamic deflection D of the bridge 2 measured by the dynamic deflection measuring device 3 is transmitted to the remaining life estimation device 1 via the communication network CN. The actual measured value DM of the dynamic deflection D of the bridge 2 transmitted to the remaining life estimation device 1 is stored in the storage device 103 in association with the measurement time of the actual measured value DM. The dynamic deflection acquisition unit 12 may acquire the actual measured value DM of the dynamic deflection D from the dynamic deflection measuring device 3, or may acquire the actual measured value DM of the dynamic deflection D stored in the storage device 103.

[0028] (Remaining life calculation step) In the remaining life calculation step S3, the actual number of years of use in the aging information A is identified from the actual measurement value DM of the dynamic deflection D acquired in the dynamic deflection acquisition step S2, thereby calculating the remaining life RL of the bridge 2. In one embodiment, the remaining life calculation step S3 is performed by the remaining life calculation unit 13. The remaining life calculation unit 13 is configured to calculate the remaining life RL of the bridge 2 by identifying the actual number of years of use acquired by the aging information acquisition unit 11 from the actual measurement value DM of the dynamic deflection D acquired by the dynamic deflection acquisition unit 12.

[0029] In the graph of Fig. 4, the measured value DM of the dynamic deflection D is plotted. As shown in Fig. 4, the plot P of the measured value DM of the dynamic deflection D is separated from the above-mentioned deterioration curve C. The remaining life calculation unit 13 slides either the plot P or the deterioration curve C (in the illustrated example, the plot P) toward the other on the horizontal axis (the number of years of use T) so that the plot P of the measured value DM of the dynamic deflection D is located on the deterioration curve C, and obtains the actual value corresponding position CP where the dynamic deflection D on the deterioration curve C has the same value as the actual value DM, and the number of years elapsed at the actual value corresponding position CP. The number of years elapsed at the actual value corresponding position CP is specified as the actual number of years of use. As shown in Figure 4, the remaining life RL of bridge 2 is the period from the actual measurement corresponding position CP to the destruction point BP on the deterioration curve C, and is calculated by subtracting the actual number of years since use (the number of years since the actual measurement corresponding position CP) from the number of years since the destruction point BP.

[0030] According to the above configuration (method), the number of years of use in the aging information A is set based on the number of vehicles 4 that pass over the bridge 2 in a pre-estimated year, which may result in an error from the actual number of years. By identifying the actual number of years of use in the aging information A from the actual measurement value DM of the dynamic deflection D, it is possible to accurately calculate (estimate) the remaining lifespan RL of the bridge 2 that is deteriorating with the passage of vehicles.

[0031] In some embodiments, in the dynamic deflection acquisition step S2, a plurality of actual measured values ​​DM of dynamic deflection D measured at different times are acquired. In the remaining life calculation step S3, the actual years of use in the aging information A are identified from the plurality of actual measured values ​​DM acquired in the dynamic deflection acquisition step S2 and the measurement times of these actual measured values ​​DM. The graph in Fig. 5 plots a plurality of actual measured values ​​DM of dynamic deflection D.

[0032] In one embodiment, for each of the multiple actual measurement values ​​DM acquired in the dynamic deflection acquisition step S2, the actual measurement corresponding position CP and the remaining lifespan RL of the bridge 2 may be calculated as described above, and the average value of the remaining lifespans of the multiple bridges 2 may be identified as the remaining lifespan RL of the bridge 2.

[0033] According to the above method, by using the actual measured values ​​DM and measurement dates of multiple dynamic deflections D, the actual number of years of use in the aging information A can be determined more accurately than in the case of using the actual measured value DM and measurement date of a single dynamic deflection D, and the remaining life span RL of the bridge 2 can be calculated (estimated) with high accuracy.

[0034] In some embodiments, in the dynamic deflection acquisition step S2, actual measured values ​​DM of a plurality of dynamic deflections D measured at different times are acquired. The remaining life calculation step S3 includes an estimated line calculation step S31 and an actual age determination step S32.

[0035] In the estimated line calculation step S31, an estimated line EL that indicates the relationship between the number of years since the bridge 2 was used and the change over time in the dynamic deflection D of the bridge 2 is calculated based on the multiple actual measurement values ​​DM and the measurement dates of the actual measurement values ​​DM acquired in the dynamic deflection acquisition step S2. The estimated line EL may be an approximate straight line EL1 as indicated by the dotted line in Fig. 5, or an approximate curve EL2 as indicated by the two-dot chain line in Fig. 5.

[0036] In the actual age determination step S32, the calculated position on the deterioration curve C calculated based on a fitting operation for fitting the deterioration curve C, which shows the age-related change in the dynamic deflection D of the bridge 2 relative to the number of years since the bridge 2 has been in use, obtained from the age-related change information A, to the estimated line EL, is determined as the actual age.

[0037] The remaining life calculation unit 13 slides either the estimated line EL or the degradation curve C along the horizontal axis (elapsed years of use T) toward the other so that at least a part of the estimated line EL contacts the degradation curve C, and specifies the contact point between the estimated line EL and the degradation curve C as the measured value corresponding position CP described above. The elapsed years of the measured value corresponding position CP are specified as the actual years of the elapsed years of use.

[0038] According to the above device (method), by the fitting operation of fitting the degradation curve C and the estimated line EL, the estimated line EL calculated from the measured value DM and the measurement time of the measured value DM can identify the corresponding part on the degradation curve C, and the calculated position on the degradation curve C can be specified as the actual years. Thereby, the actual years of the elapsed years of use in the aging change information A can be specified with higher accuracy, and the remaining life RL of the bridge 2 can be calculated (estimated) with high accuracy.

[0039] In some embodiments, the aging change information A described above includes first relational information A1 indicating the aging change of the dynamic deflection D with respect to the number of repetitions N of the dynamic deflection D, and second relational information A2 indicating the relationship between the number of repetitions N and the elapsed years of use T of the bridge 2. As shown in FIG. 1, the remaining life estimation method described above further includes a correction step S4. In some other embodiments, the remaining life estimation method may not include the correction step S4.

[0040] (Correction step) The correction step S4 is performed before the remaining life calculation step S3. In the correction step S4, the second relational information A2 is corrected based on the plurality of measured values DM obtained in the dynamic deflection acquisition step S2, the measurement time of the measured values DM, and the first relational information A1. For example, as shown in FIG. 6, the conversion ratio between the number of repetitions N and the elapsed years of use T of the bridge 2 may be changed so that the sum of the distances between the degradation curve C and the plurality of measured values DM is small (for example, minimized). The corrected degradation curve MC shown in FIG. 6 is the degradation curve C after changing the conversion ratio between the number of repetitions N and the elapsed years of use T of the bridge 2. In the remaining life calculation step S3, the aging change information A corrected in the correction step S4 is used.

[0041] In an embodiment, the remaining life estimation device 1 further includes a correction unit 14 configured to correct the second relationship information A2 based on the multiple actual measurement values ​​DM and the measurement times of the actual measurement values ​​DM acquired by the dynamic deflection acquisition unit 12, and the first relationship information A1. The correction step S4 is performed by the correction unit 14.

[0042] According to the above device (method), in the correction step S4, the second relationship information A2 (relationship between the number of repetitions and the number of years of use) is corrected based on the multiple actual measurement values ​​DM and measurement times, and the first relationship information A1, thereby reducing the error between the actual number of years of use in the second relationship information A2. This makes it possible to accurately identify the actual number of years of use in the aging information A from the actual measurement values ​​DM of the dynamic deflection D.

[0043] In some embodiments, the dynamic deflection acquisition step S2 described above acquires the dynamic deflection D of the span center portion 29 of the bridge 2 caused by the live load when a vehicle 4 of a predetermined weight travels across the bridge 2. Note that it is preferable that the dynamic deflection D of the bridge 2 in the aging information A described above is also the dynamic deflection D of the span center portion 29.

[0044] According to the above-mentioned device (method), since the dynamic deflection D of the central span 29 of the bridge 2 is larger and its behavior is easier to grasp than that of other parts of the bridge 2, it is preferable to estimate the remaining life RL of the bridge 2 using the change over time in the dynamic deflection D of the central span 29 of the bridge 2.

[0045] In some embodiments, concrete material is used for the members constituting the superstructure 21 of the bridge 2 described above. The members constituting the superstructure 21 may be made of not only concrete material but also steel material. When a concrete material is used for the superstructure 21 of such a bridge 2, the remaining life span RL of the bridge 2, which is subject to deterioration over time due to the passage of vehicles, can be accurately calculated (estimated) by the above-mentioned device (method).

[0046] In some embodiments, at least a finite element analysis model M1 regarding the deterioration progress of concrete material is used for the analysis of the above-mentioned aging information A. The finite element analysis model M1 receives input information of the properties (dimensions, shape, mix proportion, pouring temperature, curing conditions, environmental conditions, etc.) of the concrete material constituting the bridge 2, and outputs the thermodynamic state of the concrete material constituting the bridge 2 using an equation of state and the law of conservation of mass and energy as governing equations. As the finite element analysis model M1, for example, a thermodynamic coupled analysis system including at least a hydration heat model, a pore structure formation model, and a moisture retention and movement model of the concrete material, and the like, has been put to practical use.

[0047] According to the above-mentioned device (method), by using a finite element analysis model M1 regarding the deterioration progression of concrete material to analyze the aging information A, the microscopic behavior of the bridge 2, specifically the deterioration progression of the concrete material, can be reflected in the analysis results, thereby improving the accuracy of the aging information A.

[0048] The finite element analysis model M1 may be stored in the above-mentioned storage device 103, or may be stored in a device (e.g., a data server) other than the remaining life estimation device 1. The aging information acquisition unit 11 may be configured to acquire the aging information A by analysis using the finite element analysis model M1 stored in the storage device 103 or the like.

[0049] In some embodiments, a finite element analysis model M1 relating to the structure of the bridge 2 is used to analyze the aging information A described above. The finite element analysis model M1 can also express the constitutive law of the reinforced concrete structure that constitutes the bridge 2. The finite element analysis model M1 receives input information such as the dimensions, shapes, and mechanical boundary conditions in structural mechanics of the various members that constitute the bridge, and outputs the mechanical state of the structure of the bridge 2 using deformation compatibility condition equations and the law of conservation of momentum as governing equations.

[0050] According to the above-mentioned device (method), by using a finite element analysis model M1 of the bridge structure to analyze the aging information A, the macroscopic response and damage of the bridge 2 can be reflected in the analysis results, thereby improving the accuracy of the aging information A.

[0051] In some embodiments, when the remaining life span RL of the bridge 2 becomes shorter than a predetermined period, the bridge 2 may be repaired, and the above-mentioned dynamic deflection acquisition step S2 and remaining life span calculation step S3 may be performed again after the bridge 2 is repaired, to calculate (estimate) the remaining life span RL of the bridge 2 after repair. Note that the bridge 2 may be repaired so that the remaining life span RL of the bridge 2 is not shorter than the predetermined period.

[0052] In this specification, expressions expressing relative or absolute configuration, such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial," do not only strictly represent such a configuration, but also represent a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions indicating that things are in an equal state, such as "identical," "equal," and "homogeneous," not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. Furthermore, in this specification, expressions describing shapes such as a rectangular shape or a cylindrical shape do not only refer to shapes such as a rectangular shape or a cylindrical shape in the strict geometric sense, but also refer to shapes that include uneven portions, chamfered portions, etc., to the extent that the same effect is obtained. In addition, in this specification, the expressions "comprise," "include," or "have" a certain element are not exclusive expressions that exclude the presence of other elements.

[0053] The present disclosure is not limited to the above-described embodiments, and includes modifications to the above-described embodiments and appropriate combinations of these modifications.

[0054] The contents described in the above-mentioned embodiments can be understood, for example, as follows.

[0055] 1) A remaining life estimation method according to at least one embodiment of the present disclosure includes: A remaining life estimation method for estimating a remaining life (RL) of a bridge (2), comprising: An aging information acquisition step (S1) of acquiring, by analysis, aging information (A) indicating an aging change of a dynamic deflection (D) of the bridge (2) relative to the number of years (T) of use of the bridge (2); A dynamic deflection acquisition step (S2) of acquiring an actual measurement value (DM) of the dynamic deflection (D) of the bridge (2); and a remaining life calculation step (S3) of calculating a remaining life (RL) of the bridge (2) by identifying the actual number of years of use in the aging information (A) from the actual measured value (DM) of the dynamic deflection (D).

[0056] According to the method 1) above, the number of years of use in the aging information (A) is set based on the number of vehicles (4) that pass over the bridge (2) in a pre-estimated year, which may result in an error with the actual number of years of use. By identifying the actual number of years of use in the aging information (A) from the actual measurement value (DM) of the dynamic deflection (D), the remaining life (RL) of the bridge (2) that is deteriorating with the passage of vehicles can be calculated (estimated) with high accuracy.

[0057] 2) In some embodiments, the remaining life estimation method according to 1) above comprises the steps of: In the dynamic deflection acquisition step (S2), a plurality of actual measurements (DM) each measured at a different time are acquired, In the remaining life calculation step (S3), the actual years are identified from the plurality of actual measurement values ​​(DM) acquired in the dynamic deflection acquisition step (S2) and the measurement times of the actual measurement values ​​(DM).

[0058] According to the method of 2) above, by using the measured values ​​(DM) and measurement dates of multiple dynamic deflections (D), the actual years of use in the aging information (A) can be determined more accurately than in the case of using the measured value (DM) and measurement date of a single dynamic deflection (D), and the remaining life (RL) of the bridge (2) can be calculated (estimated) with high accuracy.

[0059] 3) In some embodiments, the remaining life estimation method according to 2) above, further comprising the steps of: The remaining life calculation step (S3) an estimation line calculation step (S31) of calculating an estimation line (EL) showing a relationship between the number of years since the bridge was used and the change over time in dynamic deflection of the bridge, based on the plurality of actual measurement values ​​(DM) acquired in the dynamic deflection acquisition step (S2) and the measurement dates of the actual measurement values ​​(DM); and an actual age determination step (S32) of determining, as the actual age, a calculated position on the deterioration curve (C) calculated based on a fitting operation of fitting the deterioration curve (C) showing the age-related change in the dynamic deflection of the bridge relative to the number of years since the bridge was used, obtained from the age-related change information (A), to the estimated line (EL).

[0060] According to the method of 3) above, by performing a fitting operation to fit the deterioration curve (C) and the estimated line (EL), the corresponding portion of the deterioration curve (C) can be identified between the actual measured values ​​(DM) and the estimated line (EL) calculated from the measurement time of the actual measured values ​​(DM), and the calculated position on the deterioration curve (C) can be identified as the actual years. This makes it possible to more accurately identify the actual years of use in the aging information (A), and to accurately calculate (estimate) the remaining life (RL) of the bridge (2).

[0061] 4) In some embodiments, the remaining life estimation method according to 2) or 3) above, further comprising the steps of: The aging information (A) is First relationship information (A1) indicating a change in the dynamic deflection over time with respect to the number of repetitions of the dynamic deflection; and second relationship information (A2) indicating a relationship between the number of repetitions and the number of years since the bridge was in use, The remaining life estimation method includes: The method further includes, before the remaining life calculation step (S3), a correction step (S4) of correcting the second relationship information (A2) based on the multiple actual measurement values ​​(DM) and the measurement times of the actual measurement values ​​(DM) acquired in the dynamic deflection acquisition step, and the first relationship information (A1).

[0062] According to the method of 4) above, in the correction step (S4), the second relationship information (A2, the relationship between the number of repetitions and the number of years of use) is corrected based on the multiple actual measurements (DM), the measurement times, and the first relationship information (A1), thereby reducing the error between the actual number of years of use in the second relationship information (A2). This makes it possible to accurately identify the actual number of years of use in the aging information (A) from the actual measurements (DM) of the dynamic deflection (D).

[0063] 5) In some embodiments, the remaining life estimation method according to any one of 1) to 4) above, further comprising: In the dynamic deflection acquisition step (S2), A dynamic deflection of the center of the span of the bridge due to a live load when a vehicle of a predetermined weight runs on the bridge is obtained.

[0064] According to the above method 5), since the dynamic deflection of the center of the bridge span is larger than that of other parts of the bridge and its behavior is easier to grasp, it is preferable to estimate the remaining life (RL) of the bridge (2) using the change over time in the dynamic deflection (D) of the center of the bridge span.

[0065] 6) In some embodiments, the remaining life estimation method according to any one of 1) to 5) above, further comprising: Concrete materials are used for the members constituting the superstructure of the bridge.

[0066] According to the method 6) above, when concrete materials are used for the superstructure of the bridge, the remaining life (RL) of the bridge (2) that is deteriorating with time due to the passage of vehicles can be calculated (estimated) with high accuracy.

[0067] 7) In some embodiments, the remaining life estimation method according to 6) above, further comprising the steps of: The analysis of the aging information (A) includes: At least a finite element analysis model regarding the deterioration progression of the concrete material is used.

[0068] According to the method of 7) above, by using a finite element analysis model regarding the deterioration progression of concrete materials in the analysis of the aging information (A), the microscopic behavior of the bridge (2), specifically the deterioration progression of the concrete materials, can be reflected in the analysis results, thereby improving the accuracy of the aging information (A).

[0069] 8) In some embodiments, the remaining life estimation method according to any one of 1) to 7) above, further comprising: The analysis of the aging information (A) includes: At least a finite element analysis model of the bridge structure is used.

[0070] According to the method 8) above, by using a finite element analysis model of the bridge structure in the analysis of the aging information (A), the macroscopic response and damage of the bridge (2) can be reflected in the analysis results, thereby improving the accuracy of the aging information (A).

[0071] 9) The remaining life estimation device (1) according to at least one embodiment of the present disclosure is A remaining life estimation device (1) for estimating a remaining life (RL) of a bridge (2), comprising: an aging information acquisition unit (11) configured to acquire, by analysis, aging information (A) indicating an aging change of a dynamic deflection (D) of the bridge (2) relative to the number of years (T) since the bridge (2) has been in use; A dynamic deflection acquisition unit (12) configured to acquire an actual measurement value (DM) of the dynamic deflection (D) of the bridge (2); and a remaining life calculation unit (13) configured to calculate a remaining life (RL) of the bridge (2) by identifying the actual number of years of use in the aging information (A) from the actual measured value (DM) of the dynamic deflection (D).

[0072] According to the structure of 9) above, the number of years of use in the aging information (A) is set based on the number of vehicles (4) that pass over the bridge (2) in a pre-estimated year, which may result in an error with the actual number of years of use. By identifying the actual number of years of use in the aging information (A) from the actual measurement value (DM) of the dynamic deflection (D), the remaining life (RL) of the bridge (2) that is deteriorating with the passage of vehicles can be calculated (estimated) with high accuracy. [Explanation of symbols]

[0073] 1 Remaining life estimation device 2. Bridges 3. Dynamic deflection measuring device 4. Vehicles 10 Remaining life estimation system 11. Aging information acquisition section 12 Dynamic deflection acquisition unit 13 Remaining life calculation section 14 Correction section 21 Superstructure 22 Undercarriage 23 Bridge surface 24 Main digit 25 Floor slab 26 Pavement 27 Abutment 28 Bridge Pier 29 Center of span 31 Acceleration Sensor 32 Integrator 33 Transmitter 100 Electronic Control Unit 101 Input Device 101A Receiver 102 Output Device 103 Storage device 104 Arithmetic equipment A. Aging information BP Breaking Point C Deterioration curve CN Communication Network CP actual measurement corresponding position D Dynamic Deflection DM actual value EL Estimated Line EL1 Approximate line EL2 trendline MC modified degradation curve N Number of repetitions P plot RL Remaining life S1 Acquisition of aging information step S2 Dynamic deflection acquisition step S3 Remaining life calculation step S31 Estimated line calculation step S32 Actual year determination step S4 Correction Steps T Years of use

Claims

1. A remaining life estimation method for estimating a remaining life of a bridge, comprising: an aging information acquisition step of acquiring, by analysis, aging information indicating an aging change in dynamic deflection of the bridge with respect to the number of years since the bridge has been in use; A dynamic deflection acquisition step of acquiring an actual measured value of the dynamic deflection of the bridge; and a remaining life calculation step of calculating a remaining life of the bridge by identifying an actual number of years of use in the aging information from the actual measurement value of the dynamic deflection. Remaining life estimation method.

2. In the dynamic deflection acquisition step, a plurality of actual measured values ​​are acquired, each measured at a different time; In the remaining life calculation step, the actual years are identified based on the plurality of actual measurement values ​​acquired in the dynamic deflection acquisition step and measurement times of the actual measurement values. The remaining life estimation method according to claim 1 .

3. The remaining life calculation step includes: an estimation line calculation step of calculating an estimation line showing a relationship between the number of years since the bridge was used and the change over time in dynamic deflection of the bridge, based on the plurality of actual measurement values ​​and the measurement times of the actual measurement values ​​acquired in the dynamic deflection acquisition step; and an actual age specifying step of specifying, as the actual age, a calculated position on the deterioration curve calculated based on a fitting operation for fitting the deterioration curve, which indicates an aging change in the dynamic deflection of the bridge with respect to the number of years since the bridge was used, obtained from the aging information, to the estimated line. The remaining life estimation method according to claim 2 .

4. The aging information is First relationship information indicating a change in the dynamic deflection over time with respect to the number of repetitions of the dynamic deflection; and second relationship information indicating a relationship between the number of repetitions and the number of years of use of the bridge, The remaining life estimation method includes: a correction step of correcting the second relationship information based on the plurality of actual measurement values ​​and measurement times of the actual measurement values ​​acquired in the dynamic deflection acquisition step, and the first relationship information, prior to the remaining life calculation step; The remaining life estimation method according to claim 2 or 3.

5. In the dynamic deflection acquisition step, A dynamic deflection of a central portion of the span of the bridge due to a live load when a vehicle of a predetermined weight runs on the bridge is acquired. The remaining life estimation method according to any one of claims 1 to 3.

6. Concrete materials are used for the members constituting the superstructure of the bridge. The remaining life estimation method according to any one of claims 1 to 3.

7. The analysis of the aging information includes: At least a finite element analysis model regarding the deterioration progress of the concrete material is used; The remaining life estimation method according to claim 6.

8. The analysis of the aging information includes: At least a finite element analysis model regarding the structure of the bridge is used; The remaining life estimation method according to any one of claims 1 to 3.

9. A remaining life estimation device for estimating the remaining life of a bridge, comprising: an aging information acquisition unit configured to acquire, by analysis, aging information indicating an aging change in dynamic deflection of the bridge with respect to the number of years since the bridge was used; A dynamic deflection acquisition unit configured to acquire an actual measured value of dynamic deflection of the bridge; and a remaining life calculation unit configured to calculate a remaining life of the bridge by identifying an actual number of years of use in the aging information from the actual measurement value of the dynamic deflection. Remaining life estimation device.

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