KR20210060698A - System and method for evaluating load carry capacity of bridge - Google Patents

Abstract

A system and a method for evaluating a load-bearing capacity of a bridge are disclosed. The load-bearing capacity evaluation system of a bridge according to an aspect of the present invention comprises: an image acquisition unit installed in a vehicle to acquire image information; an acceleration measuring unit installed in the vehicle to measure a vibration acceleration of the vehicle; and an evaluation device that calculates a displacement of the bridge based on the image information received from the image acquisition unit and the vibration acceleration received from the acceleration measuring unit, and evaluates the load-bearing force of the bridge based on the calculated displacement.

Description

A system and method for evaluating the load carrying capacity of a bridge {SYSTEM AND METHOD FOR EVALUATING LOAD CARRY CAPACITY OF BRIDGE}

The present invention relates to a system and method for evaluating the load bearing capacity of a bridge, and more particularly, to a bridge for evaluating the load bearing capacity of a bridge based on image information from an image acquisition unit installed on a vehicle and vibration acceleration from an acceleration measurement unit installed on the vehicle. It relates to a load carrying capacity evaluation system and method.

Bridges are major facilities of roads that become the core of social indirect facilities, and are built to ensure stability during the period of service. If the construction quality of the bridge is good, and the properties of the constituent materials and the externally acting environment do not change significantly, the bridge function can be safely performed during the design life set at the time of design.

However, over time, the bridge is damaged by various causes such as changes in the traffic environment and deterioration of materials, so it is necessary to extend the lifespan and secure safety through proper maintenance.

The safety of the bridge can be confirmed through the load-bearing capacity evaluation of the bridge, and the load-bearing capacity evaluation of such a bridge can be performed based on the acceleration measured in the bridge. For example, an acceleration sensor is installed on the bridge, the mode factor of the bridge is calculated through the acceleration signal using the vibration acceleration measured by the acceleration sensor, and the load bearing capacity is calculated by improving the analytical model of the bridge using the calculated mode factor. .

However, in the related art, since it is necessary to install an acceleration sensor in a bridge structure, there are many disadvantages in terms of time and space limitations due to the installation of the acceleration sensor.

In addition, since it is not possible to attach an acceleration sensor such as a bridge in a river crossing section or an underdeveloped area, it is difficult to evaluate the load carrying capacity in an area where visual inspection is opaque other than inside the vehicle.

Accordingly, there is a need to develop a technology capable of evaluating the load carrying capacity even in a bridge in which an acceleration sensor cannot be attached.

The background technology of the present invention is disclosed in Korean Patent Registration No. 10-1966666 (a device and method for evaluating a load carrying capacity of a bridge).

The present invention was conceived to improve the above problems, and an object according to an aspect of the present invention is to provide a load-bearing capacity evaluation system and method of a bridge capable of evaluating the load-bearing capacity even in a bridge to which an acceleration sensor cannot be attached.

The problem to be solved by the present invention is not limited to the problem(s) mentioned above, and another problem(s) not mentioned will be clearly understood by those skilled in the art from the following description.

The load bearing capacity evaluation system of a bridge according to an aspect of the present invention includes an image acquisition unit installed in a vehicle to obtain image information, an acceleration measurement unit installed in the vehicle to measure vibration acceleration of the vehicle, and from the image acquisition unit. And an evaluation device that calculates the displacement of the bridge based on the received image information and the vibration acceleration received from the acceleration measurement unit, and evaluates the load bearing capacity of the bridge based on the calculated displacement.

In the present invention, the image acquisition unit and the acceleration measurement unit may be characterized in that the time is synchronized based on the same reference time so that the positions of the vehicle respectively acquired may be synchronized.

In the present invention, the evaluation device obtains a maximum displacement from image information when the vehicle passes through the bridge, calculates a second displacement based on the vibration acceleration of the first position having the maximum displacement, and calculates the maximum displacement. A displacement calculation unit that calculates a correction factor by comparing the displacement and the second displacement, applies the correction factor to the vibration acceleration of the bridge to calculate the displacement of the bridge, and calculates an analysis model of the bridge using the calculated correction factor. It may include an updated analysis model update unit, a load-bearing force calculation unit for calculating the load carrying capacity of the bridge using the correction factor and the updated analysis model of the bridge.

In the present invention, the displacement calculation unit detects a preset target from image information when the vehicle passes the bridge, calculates first displacements of the bridge based on the detected coordinate value of the target, and calculates the first displacement of the bridge. A maximum displacement calculation unit that obtains the maximum displacement among the 1 displacements, obtains a first position having the maximum displacement in the bridge, double-integrates the vibration acceleration of the first position to calculate a second displacement, and the maximum displacement Comprising a correction factor calculation unit for calculating a correction factor by comparing the second displacement with the second displacement, and a final displacement calculation unit for calculating the displacement of the bridge by applying the correction factor to the vibration acceleration of a position other than the first position in the bridge. I can.

In the present invention, the final displacement calculation unit may calculate a displacement by double-integrating the vibration acceleration of a position other than the first position in the bridge, and apply the correction factor to the calculated displacement to calculate the displacement of the bridge. .

A method for evaluating load bearing capacity of a bridge according to another aspect of the present invention includes, by an evaluation device, receiving image information and vibration acceleration of the vehicle from an image acquisition unit and an acceleration measurement unit installed in the vehicle, and the evaluation device includes the image information And calculating a displacement of the bridge based on the vibration acceleration of the vehicle, and calculating, by the evaluation device, a load bearing force of the bridge based on the calculated displacement.

In the present invention, in the step of receiving the image information and the vibration acceleration of the vehicle, the image information and the vibration acceleration of the vehicle are synchronized based on the same reference time so that the position of the vehicle can be synchronized. It can be characterized.

In the present invention, the step of calculating the displacement of the bridge includes: calculating, by the evaluation device, a maximum displacement from image information when the vehicle passes through the bridge, and the evaluation apparatus is at a first position having the maximum displacement. Calculating a second displacement based on the vibration acceleration, calculating a correction coefficient by comparing the maximum displacement and the second displacement, wherein the evaluation device applies the correction coefficient to the vibration acceleration of the bridge to determine the displacement of the bridge. It may include the step of calculating.

In the present invention, the calculating of the maximum displacement includes the evaluation device detecting a preset target from the image information, and the evaluation device calculating first displacements of the bridge based on the detected coordinate value of the target. And obtaining a maximum displacement among the first displacements.

In the present invention, in the step of calculating the displacement of the bridge by applying the correction factor to the vibration acceleration of the bridge, the evaluation device calculates displacement by double-integrating the vibration acceleration of the position excluding the first position in the bridge, The displacement of the bridge may be calculated by applying the correction factor to the calculated displacement.

The system and method for evaluating the load carrying capacity of a bridge according to an embodiment of the present invention include an acceleration sensor by evaluating the load carrying capacity of a bridge based on image information from an image acquisition unit installed in a vehicle and a vibration acceleration from an acceleration measurement unit installed in the vehicle. It is possible to evaluate the load-bearing capacity even in a bridge that cannot be attached.

The system and method for evaluating the load-bearing capacity of a bridge according to another embodiment of the present invention can indirectly evaluate the state of the bridge through visual inspection and minimal information installed in the vehicle in an extreme environment where various sensors cannot be installed on the bridge. There are temporal and spatial advantages.

Meanwhile, the effects of the present invention are not limited to the above-mentioned effects, and various effects may be included within a range that is apparent to a person skilled in the art from the contents to be described below.

1 is a block diagram schematically showing a load bearing capacity evaluation system of a bridge according to an embodiment of the present invention.
2 is a block diagram schematically showing an evaluation apparatus according to an embodiment of the present invention.
3 is a block diagram illustrating in detail the displacement calculation unit shown in FIG. 2.
4 is an exemplary view for explaining a maximum displacement according to an embodiment of the present invention.
5 is a flowchart illustrating a method of evaluating load bearing capacity of a bridge according to an embodiment of the present invention.

Hereinafter, a system and method for evaluating a load bearing capacity of a bridge according to an embodiment of the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of users or operators. Therefore, definitions of these terms should be made based on the contents throughout the present specification.

Further, the implementation described herein may be implemented in, for example, a method or process, an apparatus, a software program, a data stream or a signal. Although discussed only in the context of a single form of implementation (eg, only as a method), the implementation of the discussed features may also be implemented in other forms (eg, an apparatus or program). The device may be implemented with appropriate hardware, software and firmware. The method may be implemented in an apparatus such as a processor, which generally refers to a processing device including, for example, a computer, microprocessor, integrated circuit or programmable logic device, or the like. Processors also include communication devices such as computers, cell phones, personal digital assistants (“PDAs”) and other devices that facilitate communication of information between end-users.

1 is a block diagram schematically showing a load bearing capacity evaluation system of a bridge according to an embodiment of the present invention.

Referring to FIG. 1, a system for evaluating load bearing capacity of a bridge according to an embodiment of the present invention includes an image acquisition unit 100, an acceleration measurement unit 200, and an evaluation device 300.

The image acquisition unit 100 is installed in a vehicle, acquires image information, and transmits the acquired image information to the evaluation device 300. That is, the image acquisition unit 100 is installed in a vehicle to capture a front image of the vehicle traveling, and may be, for example, a camera. In this case, the image acquisition unit 100 may acquire a high-precision line image.

In addition, the image acquisition unit 100 may acquire the time when the image information is acquired together with the image information acquisition. That is, the image acquisition unit 100 may acquire a transit time, which is a time from the time when the vehicle enters the bridge to the time when the passage is completed.

The acceleration measurement unit 200 is installed in the vehicle, measures the vibration acceleration of the vehicle, and transmits the measured vibration acceleration to the evaluation device 300. That is, the acceleration measurement unit 200 measures the vibration acceleration at each point when the vehicle passes through the bridge. The bridge is vibrated by a vehicle passing through the upper side of the bridge, and the acceleration measuring unit 200 installed in the vehicle measures the acceleration due to such vibration, and can accumulate a signal due to the acceleration at each point on the bridge. Here, the acceleration measurement unit 200 may be, for example, a 3-axis acceleration.

The acceleration measurement unit 200 may acquire a measurement time together with a vibration acceleration measurement. That is, the acceleration measurement unit 200 may obtain a passing time, which is a time from the time when the vehicle enters the bridge to the time when the passage is completed, as the measurement time.

The image acquisition unit 100 and the acceleration measurement unit 200 may synchronize the time based on the same reference time so that the positions of the vehicle respectively acquired may be synchronized.

The reference time used as a reference time for time synchronization of the image acquisition unit 100 and the acceleration measurement unit 200 may be a standard time provided from an external authentication server. The standard time provided from an external authentication server may mean, for example, a standard time provided by the Korea Research Institute of Standards and Science (KRISS) server in Korea, and furthermore, the authentication server of each country's standard organization. Each country's standard time provided from

On the other hand, since vehicles frequently pass through the bridge, vibrations are induced in the bridge as the vehicle passes. In addition, due to the weight of the vehicle, sagging is caused in the bridge while the vehicle is passing through the bridge. Accordingly, in this embodiment, displacement due to vibration and deflection of the bridge may be calculated using image information and vibration acceleration when the vehicle passes.

The evaluation device 300 calculates the displacement of the bridge based on the image information input from the image acquisition unit 100 and the vibration acceleration input from the acceleration measurement unit 200, and evaluates the load bearing capacity of the bridge based on the calculated displacement. do.

A detailed description of the evaluation device 300 will be made with reference to FIG. 2.

2 is a block diagram schematically showing an evaluation apparatus according to an embodiment of the present invention, FIG. 3 is a block diagram illustrating in detail the displacement calculation unit shown in FIG. 2, and FIG. 4 is a block diagram illustrating a maximum displacement according to an embodiment of the present invention. It is an exemplary diagram for explanation.

Referring to FIG. 2, the evaluation apparatus 300 according to an embodiment of the present invention includes a collection unit 310, a displacement calculation unit 320, an analysis model update unit 330, and a load-bearing force calculation unit 340. .

The collection unit 310 receives image information from the image acquisition unit 100 and receives the vibration acceleration of the vehicle from the acceleration measurement unit 200. In this case, the collection unit 310 may acquire a passing time, which is a time from the point when the vehicle enters the bridge and passes through it.

The collection unit 310 transmits the received image information and vibration acceleration to the displacement calculation unit 320.

The displacement calculation unit 320 obtains the maximum displacement from image information when the vehicle passes through the bridge, calculates a second displacement based on the vibration acceleration of the first position having the maximum displacement, and calculates the maximum displacement and the second displacement. The correction factor is calculated by comparing and, and the displacement of the bridge is calculated by applying the correction factor to the vibration acceleration of the bridge.

The displacement calculation unit 320 includes a maximum displacement calculation unit 322, a correction coefficient calculation unit 324, and a final displacement calculation unit 326 as shown in FIG. 3.

The maximum displacement calculation unit 322 detects a preset target from image information when the vehicle passes through the bridge, calculates first displacements of the bridge based on the detected coordinate value of the target, and calculates the maximum displacement among the first displacements. Acquire the displacement.

That is, the maximum displacement calculation unit 322 may accumulate image information from the point when the vehicle enters the bridge to the point at which the passage is completed, and detect each preset target from the accumulated image information. Then, the maximum displacement calculation unit 322 may check the coordinate value of the target in each image, and calculate a difference between the checked coordinate value and the preset target coordinate value as the first displacement of the bridge. The maximum displacement calculator 322 may select a maximum displacement among the first displacements.

On the other hand, since the displacement of the bridge is greatest in the central portion as illustrated in FIG. 4, the maximum variable calculation unit may calculate the maximum displacement of the bridge from image information corresponding to the central portion of the bridge among a plurality of image information.

The correction coefficient calculation unit 324 obtains a first position having a maximum displacement in the bridge, calculates a second displacement by double-integrating the vibration acceleration of the first position, and compares the maximum displacement and the second displacement to calculate a correction coefficient. Calculate. That is, the correction factor calculation unit 324 may calculate a second displacement due to vibration and deflection of the bridge by double-integrating the vibration acceleration corresponding to the first position of the bridge. Then, the correction coefficient calculation unit 324 may calculate a difference value between the maximum displacement and the second displacement as a correction coefficient.

The final displacement calculation unit 326 calculates the displacement of the bridge by applying a correction factor to the vibration acceleration of the position other than the first position in the bridge. That is, the final displacement calculation unit 326 calculates the displacement at each position by double-integrating the vibration acceleration at positions other than the first position on the bridge, and applies a correction factor to the calculated displacement at each position. The displacement of can be calculated.

Referring back to FIG. 2, the analysis model update unit 330 updates the analysis model of the bridge using the displacement of the bridge calculated by the displacement calculation unit 320.

The initial analysis model of the bridge consists of a finite element analysis model. The finite element analysis model is a model for performing finite element analysis, and the initial finite element analysis model is derived from the design information of the bridge to be evaluated or calculated, for example, the design specifications of the bridge. I can. The coefficients used in the finite element analysis model include the second-order moment of each element divided for the finite element analysis, the modulus of elasticity, the thickness, and the torsion moment of the cross-section. The design values of the coefficients of each element used in the finite element model may be close to the actual coefficients of the initial state of the structure, but are influenced by various loads acting on the structure and environmental factors such as weather and temperature changes over time. The strength of the structure gradually deteriorates as it receives. Therefore, if a finite element model that reflects the current deterioration condition can be obtained, the deflection when a specific load is loaded at a specific point using the current finite element model reflecting the deterioration is obtained at a specific point of the actual bridge. One of the most important characteristics of the present invention is that it is possible to obtain a result similar to the actual load test result without performing a load test that applies a load using a loading vehicle, etc. Therefore, the improvement of this finite element model is a bridge according to the present invention. It is one of the most important steps in the calculation of the load carrying capacity.

The improvement of the finite element model to reflect the current state is to use the characteristic that when the coefficients of the finite element model are determined to a specific value, the dynamic characteristics by such finite element model coefficients are uniquely determined. Therefore, each coefficient of the finite element model reflecting the natural frequency and the mode shape, which are the dynamic characteristics of the current structure, is determined as one, and using such characteristics, a finite element model reflecting the characteristics of the current structure can be obtained. will be.

Various algorithms can be used to improve the finite element model. These algorithms include neural network techniques, genetic algorithms, downhill simplex methods, etc. These algorithms are known in various textbooks and papers as algorithms that can be used universally to obtain specific solutions. If you have ordinary knowledge in the field to which you belong, detailed information can be known through textbooks or thesis, so detailed descriptions will be omitted here.

The load-bearing force calculation unit 340 calculates the load-bearing force of the bridge using the correction factor and the updated analysis model of the bridge.

The load bearing capacity of the bridge can be calculated using the design live load (Pr), the bearing capacity (RF), and the correction factor (K _{δ ).} Accordingly, the load-bearing force calculation unit 340 may calculate the load-bearing force by using Equation 1 below.

[Equation 1]

Here, Pr is a given design live load, and RF may be a value obtained through finite element analysis model analysis of a bridge.

Meanwhile, the evaluation apparatus 300 disclosed herein is a computing environment (eg, a personal computer, a server computer, a handheld or laptop device, a mobile device (mobile phone, PDA, media player, etc.), a multiprocessor system, and a consumer electronic device). , A mini computer, a mainframe computer, a distributed computing environment including any of the aforementioned systems or devices, etc.). The computing environment includes a processor (e.g., a central processing unit (CPU), a graphic processing unit (GPU), a microprocessor, an application specific integrated circuit (ASIC), Field Programmable Gate Arrays (FPGA), etc.)), memory (e.g.: Volatile memory (e.g. RAM, etc.), non-volatile memory (e.g. ROM, flash memory, etc.), magnetic storage, optical storage, etc.), input devices (e.g. keyboard, mouse, pen, voice input device, touch Input devices, infrared cameras, video input devices, etc.), output devices (e.g. displays, speakers, printers, etc.) and communication connections (e.g. modems, network interface cards (NIC), integrated network interfaces, radio frequency transmitters/receivers, etc.) Ports, USB connections, etc.) may include interconnections with each other (eg, peripheral component interconnection (PCI), USB, firmware (IEEE 1394), optical bus structure, network, etc.).

5 is a flowchart illustrating a method of evaluating load bearing capacity of a bridge according to an embodiment of the present invention.

Referring to FIG. 5, the collection unit 310 receives image information and vibration acceleration of the vehicle when the vehicle passes through the bridge (S510). In this case, the image information and the vibration acceleration of the vehicle may be synchronized with the time based on the same reference time.

When step S510 is performed, the displacement calculating unit 320 obtains the maximum displacement from the image information when the vehicle passes through the bridge (S520), and calculates the second displacement based on the vibration acceleration of the first position having the maximum displacement. It is calculated (S530). That is, the displacement calculation unit 320 detects a preset target from image information when the vehicle passes through the bridge, calculates the first displacements of the bridge based on the detected coordinate value of the target, and calculates the first displacements of the bridge among the first displacements. The maximum displacement can be obtained. Then, the displacement calculating unit 320 can obtain the first position of the bridge having the maximum displacement, and double-integrate the vibration acceleration of the first position to calculate the second displacement. .

When step S530 is performed, the displacement calculation unit 320 calculates a correction factor by comparing the maximum displacement and the second displacement (S540), and calculates the displacement of the bridge by applying the correction factor to the vibration acceleration of the bridge (S550). . That is, the final displacement calculation unit 326 calculates the displacement at each position by double-integrating the vibration acceleration at positions other than the first position on the bridge, and applies a correction factor to the calculated displacement at each position. The displacement of can be calculated.

When step S550 is performed, the analysis model update unit 330 updates the analysis model of the bridge using the correction factor (S560), and the load-bearing force calculation unit 340 uses the updated analysis model and correction factor for the bridge. The load-bearing force of is calculated (S570). At this time, the load-bearing force calculation unit 340 may calculate the load-bearing force of the bridge from the design live load (Pr), the load-bearing rate (RF), and the correction factor (K _{δ ).}

As described above, the system and method for evaluating load bearing capacity of a bridge according to an embodiment of the present invention are based on image information from the image acquisition unit 100 installed in the vehicle and the vibration acceleration from the acceleration measurement unit 200 installed in the vehicle. Thus, by evaluating the load-bearing capacity of the bridge, it is possible to evaluate the load-bearing capacity even in a bridge where an acceleration sensor cannot be attached.

The system and method for evaluating the load-bearing capacity of a bridge according to another embodiment of the present invention can indirectly evaluate the state of the bridge through visual inspection and minimal information installed in the vehicle in an extreme environment where various sensors cannot be installed on the bridge. There are temporal and spatial advantages.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is only illustrative, and those of ordinary skill in the field to which the technology pertains, various modifications and other equivalent embodiments are possible. I will understand.

Therefore, the true technical protection scope of the present invention should be determined by the following claims.

100: image acquisition unit
200: acceleration measurement unit
300: evaluation device
310: collection unit
320: displacement calculation unit
322: maximum displacement calculation unit
324: correction coefficient calculation unit
326: final displacement calculation unit
330: analysis model update unit
340: load-bearing force calculation unit

Claims (10)

An image acquisition unit installed in a vehicle to obtain image information;
An acceleration measurement unit installed in the vehicle to measure vibration acceleration of the vehicle; And
An evaluation device that calculates the displacement of the bridge based on the image information input from the image acquisition unit and the vibration acceleration input from the acceleration measurement unit, and evaluates the load carrying capacity of the bridge based on the calculated displacement
Load bearing capacity evaluation system of the bridge comprising a.
The method of claim 1,
The image acquisition unit and the acceleration measurement unit, the load bearing capacity evaluation system of a bridge, characterized in that the time is synchronized based on the same reference time so that the positions of the vehicle respectively acquired can be synchronized.
The method of claim 1,
The evaluation device,
A maximum displacement is obtained from image information when the vehicle passes through the bridge, a second displacement is calculated based on the vibration acceleration of the first position having the maximum displacement, and the maximum displacement and the second displacement are compared. A displacement calculating unit calculating a displacement of the bridge by calculating a correction coefficient and applying the correction coefficient to the vibration acceleration of the bridge;
An analysis model update unit for updating an analysis model of the bridge using the calculated correction factor; And
And a load-bearing force calculation unit for calculating the load-bearing force of the bridge using the correction factor and the updated analysis model of the bridge.
The method of claim 3,
The displacement calculation unit,
Detects a preset target from image information when the vehicle passes through the bridge, calculates first displacements of the bridge based on the detected coordinate value of the target, and obtains a maximum displacement among the first displacements A maximum displacement calculation unit;
Correction for obtaining a first position having the maximum displacement in the bridge, calculating a second displacement by double-integrating the vibration acceleration of the first position, and calculating a correction factor by comparing the maximum displacement and the second displacement Coefficient calculation unit; And
And a final displacement calculation unit that calculates the displacement of the bridge by applying the correction factor to the vibration acceleration at a location other than the first location in the bridge.
The method of claim 4,
The final displacement calculation unit,
A load bearing capacity evaluation system of a bridge, characterized in that the displacement of the bridge is calculated by double-integrating the vibration acceleration of the position excluding the first position in the bridge to calculate the displacement, and applying the correction factor to the calculated displacement.
Receiving, by an evaluation device, image information and vibration acceleration of the vehicle from an image acquisition unit and an acceleration measurement unit installed in the vehicle;
Calculating, by the evaluation device, the displacement of the bridge based on the image information and the vibration acceleration of the vehicle; And
The evaluation device, calculating the load-bearing force of the bridge based on the calculated displacement
Method for evaluating the load bearing capacity of the bridge comprising a.
The method of claim 6,
In the step of receiving the image information and the vibration acceleration of the vehicle,
The image information and the vibration acceleration of the vehicle are synchronized with each other based on the same reference time so that the positions of the vehicle can be synchronized.
The method of claim 6,
The step of calculating the displacement of the bridge,
Calculating, by the evaluation device, a maximum displacement from image information when the vehicle passes through the bridge;
Calculating, by the evaluation device, a second displacement based on the vibration acceleration of the first position having the maximum displacement, and comparing the maximum displacement and the second displacement to calculate a correction coefficient; And
And calculating, by the evaluation device, the displacement of the bridge by applying the correction factor to the vibration acceleration of the bridge.
The method of claim 8,
The step of calculating the maximum displacement,
Detecting, by the evaluation device, a preset target from the image information; And
And calculating, by the evaluation device, first displacements of the bridge based on the detected coordinate value of the target, and obtaining a maximum displacement among the first displacements.
The method of claim 8,
In the step of calculating the displacement of the bridge by applying the correction factor to the vibration acceleration of the bridge,
The evaluation device calculates displacement by double-integrating vibration accelerations of positions other than the first position in the bridge, and calculating the displacement of the bridge by applying the correction factor to the calculated displacement. Assessment Methods.

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