Bridge hinge joint global damage evaluation method and system

Abstract

The application discloses a kind of bridge hinge joint global damage assessment method and system, comprising: first, the deflection data of each measuring point in the area of bridge hinge joint two sides can be obtained, and the measuring point of hinge joint side is as main measuring point, the measuring point of other side is as secondary measuring point, each main measuring point and each secondary measuring point are paired respectively, to form multiple groups of different combinations of measuring point combination.Then, based on the deflection data of two measuring points in each measuring point combination, the dynamic deflection correlation coefficient reflecting the transverse coordination work performance between the beam slab of bridge hinge joint two sides can be calculated respectively.Afterwards, all dynamic deflection correlation coefficients from the same main measuring point can be weighted and fused to obtain the corresponding weighted correlation coefficient, which reflects the transverse synergistic ability of the adjacent two pieces of beam slab based on the main measuring point.Finally, the global damage condition of bridge hinge joint can be effectively evaluated through the weighted correlation coefficient of all main measuring points.

Description

Technical Field

[0001] This invention relates to the field of computer-aided architectural design technology, specifically to a method and system for assessing the damage of bridge hinge joints across the entire area. Background Technology

[0002] The condition of the hinge joints directly affects the lateral coordination capability between precast beams in prefabricated girder bridges. If the hinge joints fail, the distribution ratio of external loads among the beams changes, and the mechanical response of each beam under external loads also changes accordingly. In other words, information about hinge joint failure is inherent in the mechanical response of each precast beam. Therefore, if the mechanical response of each precast beam slab under external loads can be monitored, it is theoretically possible to discover information about hinge joint failure or degradation of lateral coordination capability.

[0003] The paper "Safety Assessment of Hinge Joint Condition of Slab-Girder Bridge Based on Dynamic Strain Monitoring" (Zhou Liang, Yan Xingfei, et al.) describes a technique for calculating the correlation coefficient between adjacent bridges using longitudinal strain monitoring data of precast slab beams and using this correlation coefficient to assess the hinge joint condition. However, this technique only assesses the hinge joint condition using strain data from a single measuring point. The assessment results are easily affected by local effects at the measuring point and cannot truly reflect the global damage evolution of the hinge joint between adjacent slab beams. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a method and system for assessing the overall damage of bridge hinge joints, which can accurately reflect the overall damage status of hinge joints between adjacent beams. The specific details are as follows: In a first aspect, a method for assessing the overall damage of bridge hinge joints is provided. In a first implementable manner of this first aspect, the method includes: Obtain deflection data from each measuring point on both sides of the bridge hinge joint, and cross-pair the measuring points on both sides to generate multiple pairs of measuring point combinations; Based on the deflection data of two measuring points in each measuring point combination, the correlation coefficient of dynamic deflection of the beams on both sides of the bridge hinge joint is calculated. Based on the dynamic deflection correlation coefficient corresponding to the corresponding combination of measuring points, a weighted algorithm is used to calculate the weighted correlation coefficient for each measuring point. The specific calculation formula for the weighted correlation coefficient of the measuring point is as follows: ; in, For measuring points The corresponding weighted correlation coefficient, For measuring points The corresponding number of measurement point combinations, For measuring points With paired measurement points The weights corresponding to the combinations of measurement points For measuring points With paired measurement points The correlation coefficient of dynamic deflection corresponding to the combination of measuring points; The global damage index of the bridge hinge joint is determined by the weighted correlation coefficients corresponding to all measuring points.

[0005] In conjunction with the first feasible method of the first aspect, in the second feasible method of the first aspect, the deflection data of each measuring point on both sides of the bridge hinge joint are obtained, including: Acquire monitoring videos of the bridge hinge joint area, including monitoring images of the bridge hinge joint area at different time points; Multiple measuring points are marked on both sides of the bridge hinge joint in the monitoring images, and the position of each measuring point in each frame of the monitoring image is tracked and located. The deflection data of each measuring point is calculated based on its position in each frame of the monitoring image.

[0006] In conjunction with the second feasible method of the first aspect, in the third feasible method of the first aspect, monitoring videos of the bridge hinge joint area are acquired, including: Each monitoring image in the monitoring video is subjected to noise reduction, contrast enhancement, and filtering.

[0007] In conjunction with the second feasible method of the first aspect, the fourth feasible method of the first aspect involves tracking and locating the position of the measuring point in the monitoring image at different time points, including: Feature extraction is performed on the monitoring image to determine the image features corresponding to the measurement point; The corresponding image features are registered with the monitoring images corresponding to different time points to determine the position of the measuring point in the monitoring images corresponding to different time points.

[0008] In conjunction with the first feasible method of the first aspect, in the fifth feasible method of the first aspect, a weighted algorithm is used to calculate the weighted correlation coefficient corresponding to the measurement point, including: The weights of each measurement point combination corresponding to the measurement point are assigned based on the distance between the measurement point and the paired measurement point, wherein the smaller the distance, the greater the weight.

[0009] In conjunction with the first feasible method of the first aspect, in the sixth feasible method of the first aspect, the global damage index of the bridge hinge joint is determined by the weighted correlation coefficients corresponding to all measuring points, including: The weighted correlation coefficients corresponding to each measurement point are compared, and the minimum weighted correlation coefficient is taken as the global damage index.

[0010] Secondly, a bridge hinge joint global damage assessment system is provided, wherein in a first feasible embodiment of the second aspect, the system includes: The deflection data acquisition module is configured to acquire deflection data from each measuring point on both sides of the bridge hinge joint, and to cross-pair the measuring points on both sides to generate multiple pairs of measuring point combinations. The beam-slab correlation coefficient calculation module is configured to calculate the dynamic deflection correlation coefficient of the beams on both sides of the bridge hinge joint based on the deflection data of two measuring points in each measuring point combination. The module for calculating the correlation coefficient of measuring points is configured to calculate the weighted correlation coefficient of each measuring point based on the dynamic deflection correlation coefficient corresponding to the corresponding combination of measuring points, using a weighted algorithm. The specific calculation formula is as follows: ; in, For measuring points The corresponding weighted correlation coefficient, For measuring points The corresponding number of measurement point combinations, For measuring points With paired measurement points The weights corresponding to the combinations of measurement points For measuring points With paired measurement points The correlation coefficient of dynamic deflection corresponding to the combination of measuring points; The damage index determination module is configured to determine the global damage index of the bridge hinge joint by using the weighted correlation coefficients corresponding to all measuring points.

[0011] In conjunction with the first possible implementation of the second aspect, in the second possible implementation of the second aspect, the deflection data acquisition module includes: The image acquisition unit is configured to acquire monitoring videos of the bridge hinge joint area, which include monitoring images of the bridge hinge joint area at different time points; The measuring point tracking unit is configured to mark multiple measuring points on both sides of the bridge hinge joint in the monitoring image, and track and locate the position of each measuring point in each frame of the monitoring image; The data calculation unit is configured to calculate the deflection data of each measuring point based on the position of the measuring point in each frame of the monitoring image.

[0012] In conjunction with the first possible implementation of the second aspect, in the third possible implementation of the second aspect, the measurement point correlation coefficient calculation module includes: The weight allocation unit is configured to allocate the weight of each measurement point combination corresponding to the measurement point according to the distance between the measurement point and the paired measurement point, wherein the smaller the distance, the greater the weight.

[0013] In conjunction with the first possible implementation of the second aspect, in the fourth possible implementation of the second aspect, the damage index determination module includes: The correlation coefficient comparison unit is configured to compare the weighted correlation coefficients corresponding to each of the measurement points and take the minimum weighted correlation coefficient as the global damage index.

[0014] Beneficial Effects: The bridge hinge joint global damage assessment method and system of this invention can acquire deflection data from various measuring points covering different areas of the bridge hinge joint. By cross-pairing measuring points on one side of the hinge joint with measuring points on the other side, multiple different pairs of measuring points can be obtained. Based on the deflection data of two measuring points in a measuring point pair, the dynamic deflection correlation coefficient, reflecting the lateral coordination performance between the beams on both sides of the hinge joint, can be calculated. Then, a weighted algorithm is used to fuse the dynamic deflection correlation coefficients corresponding to all measuring point pairs for the same measuring point, eliminating local effect interference and thus accurately reflecting the weighted correlation coefficient that reflects the strength of the relationship between the measuring point and other paired measuring points. Finally, by combining the weighted correlation coefficients corresponding to all measuring points, the global damage status of the bridge hinge joint can be accurately assessed. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 A flowchart of a method for assessing the overall damage of bridge hinge joints according to an embodiment of the present invention; Figure 2 This is a system block diagram of a bridge hinge joint global damage assessment system provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of cross-pairing of measuring points. Detailed Implementation

[0017] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0018] like Figure 1 The flowchart shown is for a method to assess the overall damage of bridge hinge joints. This method includes: Step 1: Obtain the deflection data of each measuring point on both sides of the bridge hinge joint, and cross-pair the measuring points on both sides to generate multiple pairs of measuring point combinations; Step 2: Calculate the dynamic deflection correlation coefficient of the beams on both sides of the bridge hinge joint based on the deflection data of two measuring points in each measuring point combination. Step 3: Based on the dynamic deflection correlation coefficient corresponding to the corresponding combination of measuring points, calculate the weighted correlation coefficient for each measuring point using a weighted algorithm. The specific calculation formula for the weighted correlation coefficient of the measuring points is as follows: ; in, For measuring points The corresponding weighted correlation coefficient, For measuring points The corresponding number of measurement point combinations, For measuring points With paired measurement points The weights corresponding to the combinations of measurement points For measuring points With paired measurement points The correlation coefficient of dynamic deflection corresponding to the combination of measuring points; Step 4: Determine the global damage index of the bridge hinge joint by using the weighted correlation coefficient of all measuring points.

[0019] Specifically, firstly, deflection data at various measuring points within the area on both sides of the bridge hinge joint can be acquired. Measuring points on one side of the hinge joint are designated as primary measuring points, and those on the other side as secondary measuring points. Each primary measuring point is then paired with each secondary measuring point to form multiple sets of different measuring point combinations. For example... Figure 3 As shown, the main measuring points are 1, 2, 3, 4, and 5, and the secondary measuring points are 1', 2', 3', 4', and 5'. The measuring point combinations formed by the cross-pairing of the main measuring point 1 and the secondary measuring points include (1, 1'), (1, 2'), (1, 3'), (1, 4'), and (1, 5').

[0020] Then, based on the deflection data from two measuring points in each measuring point combination, the dynamic deflection correlation coefficient, which reflects the lateral coordination performance between the beams on both sides of the bridge hinge joint, can be calculated. The specific formula for calculating the dynamic deflection correlation coefficient is as follows: ; in, Describing covariance, , These are the deflection data sequences corresponding to two measuring points in the measuring point combination. Indicates variance.

[0021] Subsequently, a weighted correlation coefficient can be obtained by weighting and fusing all dynamic deflection correlation coefficients from the same main measuring point. This weighted correlation coefficient reflects the lateral coordination capability between two adjacent beams based on that main measuring point. Finally, the overall damage status of the bridge hinge joint can be effectively assessed using the weighted correlation coefficients of all main measuring points.

[0022] In this embodiment, optionally, in step 1, the deflection data of each measuring point on both sides of the bridge hinge joint are obtained, including: Acquire monitoring videos of the bridge hinge joint area, including monitoring images of the bridge hinge joint area at different time points; Multiple measuring points are marked on both sides of the bridge hinge joint in the monitoring images, and the position of each measuring point in each frame of the monitoring image is tracked and located. The deflection data of each measuring point is calculated based on its position in each frame of the monitoring image.

[0023] Specifically, when acquiring deflection data at various measuring points, the first step is to obtain monitoring video of the bridge hinge joint area. Then, multiple measuring points can be randomly selected within the hinge joint region on both sides of the initial frame of the monitoring video, and the position of each measuring point in each frame of the monitoring video can be tracked and located. Finally, by comparing the positions of the measuring points in each frame, the deflection data for each measuring point can be obtained. In this way, compared to the existing method of monitoring deflection data using strain gauges, deflection data from multiple measuring points can be detected simultaneously, improving the efficiency and accuracy of comprehensive damage assessment of bridge hinge joints.

[0024] In this embodiment, optionally, acquiring monitoring video of the bridge hinge joint area includes: Each monitoring image in the monitoring video is subjected to noise reduction, contrast enhancement, and filtering.

[0025] Specifically, in order to further improve the efficiency and accuracy of the overall damage assessment of bridge hinge joints, after acquiring the monitoring video, each monitoring image in the monitoring video can be denoised, contrast-enhanced and filtered to improve the image quality of the monitoring images, thereby improving the accuracy of subsequent deflection calculations.

[0026] It should be understood that the existing image denoising algorithms, contrast enhancement algorithms, and filtering algorithms used in this embodiment are all common knowledge in the field, and will not be described in detail here.

[0027] In this embodiment, optionally, tracking the position of the positioning measurement point in the monitoring image at different time points includes: Feature extraction is performed on the monitoring image to determine the image features corresponding to the measurement point; The corresponding image features are registered with the monitoring images corresponding to different time points to determine the position of the measuring point in the monitoring images corresponding to different time points.

[0028] Specifically, after selecting the measurement points in the initial frame monitoring image, existing image feature extraction methods can be used to extract precise measurement point image features from the initial frame monitoring image. Then, the same image feature extraction method is used to extract features from each subsequent frame monitoring image of the monitoring video, and the extracted image features at different locations in the monitoring images are registered with the measurement point image features. This allows for precise location of the measurement points in each frame monitoring image, thereby improving the accuracy of subsequent measurement point deflection data.

[0029] In this embodiment, optionally, in step 3, a weighted algorithm is used to calculate the weighted correlation coefficient corresponding to the measurement point, including: The weights of each measurement point combination corresponding to the measurement point are assigned based on the distance between the measurement point and the paired measurement point, wherein the smaller the distance, the greater the weight.

[0030] Specifically, the weights of all measurement point combinations from the same main measurement point can be assigned based on the distance between the main measurement point and the secondary measurement points in the measurement point combination. The specific calculation formula for the weight allocation is as follows: ; in, This represents the distance between two measuring points in a measuring point combination.

[0031] In this embodiment, optionally, in step 4, the global damage index of the bridge hinge joint is determined by the weighted correlation coefficient corresponding to all measuring points, including: The weighted correlation coefficients corresponding to each measurement point are compared, and the minimum weighted correlation coefficient is taken as the global damage index.

[0032] Specifically, after calculating the weighted correlation coefficients for all measuring points, the weighted correlation coefficients of all measuring points can be compared, and the minimum weighted correlation coefficient can be selected as the global damage index of the bridge hinge joint. ,in, Indicates the first The weighted correlation coefficient for each measuring point. The minimum weighted correlation coefficient can reflect the severity of the impact of hinge joint damage on bridge structural performance, and the overall damage index. The smaller the value, the worse the lateral coordination between the two adjacent beams, and the more severe the damage to the entire bridge hinge joint.

[0033] like Figure 2 The diagram shown is a system block diagram of a bridge hinge joint global damage assessment system. This assessment system includes: The deflection data acquisition module is configured to acquire deflection data from each measuring point on both sides of the bridge hinge joint, and to cross-pair the measuring points on both sides to generate multiple pairs of measuring point combinations. The beam-slab correlation coefficient calculation module is configured to calculate the dynamic deflection correlation coefficient of the beams on both sides of the bridge hinge joint based on the deflection data of two measuring points in each measuring point combination. The module for calculating the correlation coefficient of measuring points is configured to calculate the weighted correlation coefficient of each measuring point based on the dynamic deflection correlation coefficient corresponding to the corresponding combination of measuring points, using a weighted algorithm. The specific calculation formula is as follows: ; in, For measuring points The corresponding weighted correlation coefficient, For measuring points The corresponding number of measurement point combinations, For measuring points With paired measurement points The weights corresponding to the combinations of measurement points For measuring points With paired measurement points The correlation coefficient of dynamic deflection corresponding to the combination of measuring points; The damage index determination module is configured to determine the global damage index of the bridge hinge joint by using the weighted correlation coefficients corresponding to all measuring points.

[0034] Specifically, the evaluation system includes a deflection data acquisition module, a beam-slab correlation coefficient calculation module, a measuring point correlation coefficient calculation module, and a damage index determination module. The deflection data acquisition module acquires deflection data from various measuring points within the area on both sides of the bridge hinge joint. Measuring points on one side of the hinge joint are designated as primary measuring points, and those on the other side as secondary measuring points. Each primary and secondary measuring point is paired to form multiple sets of measuring point combinations. The beam-slab correlation coefficient calculation module calculates the dynamic deflection correlation coefficient, reflecting the lateral coordination performance between the beams and slabs on both sides of the bridge hinge joint, based on the deflection data from the two measuring points in each measurement point combination.

[0035] The measurement point correlation coefficient calculation module can perform weighted fusion of all dynamic deflection correlation coefficients from the same master measurement point to obtain the corresponding weighted correlation coefficient. This weighted correlation coefficient reflects the lateral coordination capability between two adjacent beams based on the master measurement point. The damage index determination module can effectively assess the overall damage of bridge hinge joints through the weighted correlation coefficients of all master measurement points.

[0036] In this embodiment, optionally, the deflection data acquisition module includes: The image acquisition unit is configured to acquire monitoring videos of the bridge hinge joint area, which include monitoring images of the bridge hinge joint area at different time points; The measuring point tracking unit is configured to mark multiple measuring points on both sides of the bridge hinge joint in the monitoring image, and track and locate the position of each measuring point in each frame of the monitoring image; The data calculation unit is configured to calculate the deflection data of each measuring point based on the position of the measuring point in each frame of the monitoring image.

[0037] Specifically, the deflection data acquisition module includes an image acquisition unit, a measurement point tracking unit, and a data calculation unit. The image acquisition unit acquires monitoring video of the bridge hinge joint area. The measurement point tracking unit selects multiple measurement points on both sides of the hinge joint in the initial frame of the monitoring video and tracks and locates the position of each measurement point in each frame of the monitoring video. The data calculation unit obtains the deflection data of each measurement point by comparing their positions in each frame of the monitoring video.

[0038] In this embodiment, optionally, the measurement point correlation coefficient calculation module includes: The weight allocation unit is configured to allocate the weight of each measurement point combination corresponding to the measurement point according to the distance between the measurement point and the paired measurement point, wherein the smaller the distance, the greater the weight.

[0039] Specifically, the measurement point correlation coefficient calculation module includes a weight allocation unit. This unit can calculate the distance between a measurement point and its paired measurement point based on the positions of two measurement points in a measurement point combination, and then allocate weights to each measurement point combination from the same measurement point based on the distance.

[0040] In this embodiment, optionally, the damage index determination module includes: The correlation coefficient comparison unit is configured to compare the weighted correlation coefficients corresponding to each of the measurement points and take the minimum weighted correlation coefficient as the global damage index.

[0041] Specifically, the damage index determination module includes a correlation coefficient comparison unit, which can compare the weighted correlation coefficients of all measuring points and select the minimum weighted correlation coefficient as the global damage index of the bridge hinge joint.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A method for assessing the overall damage of bridge hinge joints, characterized in that, include: Obtain deflection data from each measuring point on both sides of the bridge hinge joint, and cross-pair the measuring points on both sides to generate multiple pairs of measuring point combinations; Based on the deflection data of two measuring points in each measuring point combination, the correlation coefficient of dynamic deflection of the beams on both sides of the bridge hinge joint is calculated. Based on the dynamic deflection correlation coefficient corresponding to the corresponding combination of measuring points, a weighted algorithm is used to calculate the weighted correlation coefficient for each measuring point. The specific calculation formula for the weighted correlation coefficient of the measuring point is as follows: ； in, For measuring points The corresponding weighted correlation coefficient, For measuring points The corresponding number of measurement point combinations, For measuring points With paired measurement points The weights corresponding to the combinations of measurement points For measuring points With paired measurement points The correlation coefficient of dynamic deflection corresponding to the combination of measuring points; The global damage index of the bridge hinge joint is determined by the weighted correlation coefficients corresponding to all measuring points.

2. The method for assessing the overall damage of bridge hinge joints according to claim 1, characterized in that, Obtain deflection data at various measuring points on both sides of the bridge hinge joint, including: Acquire monitoring videos of the bridge hinge joint area, including monitoring images of the bridge hinge joint area at different time points; Multiple measuring points are marked on both sides of the bridge hinge joint in the monitoring images, and the position of each measuring point in each frame of the monitoring image is tracked and located. The deflection data of each measuring point is calculated based on its position in each frame of the monitoring image.

3. The method for assessing the overall damage of bridge hinge joints according to claim 2, characterized in that, Obtain monitoring videos of the bridge hinge joint area, including: Each monitoring image in the monitoring video is subjected to noise reduction, contrast enhancement, and filtering.

4. The method for assessing the overall damage of bridge hinge joints according to claim 2, characterized in that, Tracking and locating the position of the measuring point in the monitoring image at different time points, including: Feature extraction is performed on the monitoring image to determine the image features corresponding to the measurement point; The corresponding image features are registered with the monitoring images corresponding to different time points to determine the position of the measuring point in the monitoring images corresponding to different time points.

5. The method for assessing the overall damage of bridge hinge joints according to claim 1, characterized in that, The weighted correlation coefficients corresponding to the measurement points are calculated using a weighted algorithm, including: The weights of each measurement point combination corresponding to the measurement point are assigned based on the distance between the measurement point and the paired measurement point, wherein the smaller the distance, the greater the weight.

6. The method for assessing the overall damage of bridge hinge joints according to claim 1, characterized in that, The global damage index of the bridge hinge joint is determined by the weighted correlation coefficients corresponding to all measuring points, including: The weighted correlation coefficients corresponding to each measurement point are compared, and the minimum weighted correlation coefficient is taken as the global damage index.

7. A bridge hinge joint full-area damage assessment system, characterized in that, include: The deflection data acquisition module is configured to acquire deflection data from each measuring point on both sides of the bridge hinge joint, and to cross-pair the measuring points on both sides to generate multiple pairs of measuring point combinations. The beam-slab correlation coefficient calculation module is configured to calculate the dynamic deflection correlation coefficient of the beams on both sides of the bridge hinge joint based on the deflection data of two measuring points in each measuring point combination. The module for calculating the correlation coefficient of measuring points is configured to calculate the weighted correlation coefficient of each measuring point based on the dynamic deflection correlation coefficient corresponding to the corresponding combination of measuring points, using a weighted algorithm. The specific calculation formula is as follows: ； in, For measuring points The corresponding weighted correlation coefficient, For measuring points The corresponding number of measurement point combinations, For measuring points With paired measurement points The weights corresponding to the combinations of measurement points For measuring points With paired measurement points The correlation coefficient of dynamic deflection corresponding to the combination of measuring points; The damage index determination module is configured to determine the global damage index of the bridge hinge joint by using the weighted correlation coefficients corresponding to all measuring points.

8. The bridge hinge joint full-area damage assessment system according to claim 7, characterized in that, The deflection data acquisition module includes: The image acquisition unit is configured to acquire monitoring videos of the bridge hinge joint area, which include monitoring images of the bridge hinge joint area at different time points; The measuring point tracking unit is configured to mark multiple measuring points on both sides of the bridge hinge joint in the monitoring image, and track and locate the position of each measuring point in each frame of the monitoring image; The data calculation unit is configured to calculate the deflection data of each measuring point based on the position of the measuring point in each frame of the monitoring image.

9. The bridge hinge joint full-area damage assessment system according to claim 7, characterized in that, The correlation coefficient calculation module for the measurement points includes: The weight allocation unit is configured to allocate the weight of each measurement point combination corresponding to the measurement point according to the distance between the measurement point and the paired measurement point, wherein the smaller the distance, the greater the weight.

10. The bridge hinge joint full-area damage assessment system according to claim 7, characterized in that, The damage index determination module includes: The correlation coefficient comparison unit is configured to compare the weighted correlation coefficients corresponding to each of the measurement points and take the minimum weighted correlation coefficient as the global damage index.

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