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Bridge cluster structure damage discrimination method based on strain response cumulative distribution function difference

A technology of structural damage and probability distribution function, which is applied in image analysis, image data processing, character and pattern recognition, etc. It can solve problems such as poor cumulative distribution function, structural damage of bridge clusters, and damage discrimination of similar bridge structures, so as to reduce interference. Effect

Active Publication Date: 2020-01-17
JINAN URBAN CONSTR GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention is to solve the problem of judging the damage of similar bridge structures with a monitoring system in the cluster, and now provides a damage judging method for bridge cluster structures based on the difference of cumulative distribution function of the strain response

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  • Bridge cluster structure damage discrimination method based on strain response cumulative distribution function difference
  • Bridge cluster structure damage discrimination method based on strain response cumulative distribution function difference
  • Bridge cluster structure damage discrimination method based on strain response cumulative distribution function difference

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specific Embodiment approach 1

[0022] Specific embodiment one: the bridge cluster structure damage discrimination method based on the strain response cumulative distribution function difference described in this embodiment, the method comprises the following steps:

[0023] Step 1: Collect the structural strain monitoring data of all measuring points of all similar bridges with monitoring systems in the bridge cluster under the healthy state;

[0024] Step 2: Use the monitoring strain response cluster analysis method based on data similarity to perform cluster analysis on each column of the structural strain monitoring data, and obtain the clustering results of all measuring points according to the data correlation;

[0025] Step 3: According to the clustering results of step 2, collect the structural strain monitoring data of all measuring points in a certain category under the state to be diagnosed;

[0026] Step 4: According to the structural strain monitoring data of all measuring points in a certain ca...

specific Embodiment approach 2

[0031] Specific embodiment two: this embodiment is to further explain the bridge cluster structure damage discrimination method based on the strain response cumulative distribution function difference described in specific embodiment one. In this embodiment, all measuring points obtained in step two are obtained according to The method of clustering and dividing results of data correlation is as follows:

[0032] Step 21: According to the structural strain monitoring data set X in the healthy state obtained in step 1, each column in the matrix represents the same measuring point, and each row represents the same moment. The matrix X can be expressed as:

[0033] X=[ω 1 ,ω 2 ,…,ω i ,…,ω n ] m×n (1)

[0034] In the formula, ω i is the structural strain monitoring data of the i-th measuring point in a healthy state; 1≤i≤n; n is the number of measuring points; m is the number of sampling points in a healthy state.

[0035] Step 22: According to the structural strain monito...

specific Embodiment approach 3

[0039] Specific embodiment three: this embodiment is to further explain the bridge cluster structure damage discrimination method based on the strain response cumulative distribution function difference described in specific embodiment one. The method of structural strain monitoring data after disturbance is as follows:

[0040] Step 41: Assuming that a certain type of structural strain monitoring data set in the state to be diagnosed is a matrix Y, then the construction matrix of matrix Y is defined as:

[0041] A=Y T Y (3)

[0042] In the formula, (·) T Indicates the transposition of the matrix; Y is the structural strain monitoring data set in the state to be diagnosed, u is the number of sampling points in the state to be diagnosed; v is the number of measuring points of a certain category;

[0043] Step 42: Perform singular value decomposition on the construction matrix A:

[0044] A=US v V T (4)

[0045] In the formula, U and V are respectively the left singula...

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Abstract

The invention belongs to the field of bridge structure damage discrimination in a time-varying environment, and especially relates to a bridge cluster structure damage discrimination method based on strain response cumulative distribution function difference. The bridge cluster structure damage discrimination method based on strain response probability distribution function difference comprises the steps that 1, a clustering analysis algorithm based on monitoring strain response data similarity is utilized to divide all bridge monitoring strain response data in a cluster, and a plurality of strain response data categories with similar probability distribution are established; 2, under each data category, a denoising method based on bridge structure strain monitoring data set reconstructionis utilized to effectively improve the calculation efficiency of structural strain massive monitoring data denoising; and 3, under each data category, the influence of the time-varying environment temperature on the structure strain monitoring data is effectively eliminated by utilizing the damage discrimination factor based on the cumulative distribution function residual error, thus realizing the damage discrimination of all bridge structures in the cluster.

Description

technical field [0001] The invention belongs to the field of bridge structure damage discrimination under time-varying environment, in particular to a bridge cluster structure damage discrimination method based on the strain response cumulative distribution function difference. Background technique [0002] Structural health monitoring technology has been widely used in bridge engineering because it can continuously and reliably provide bridge structural response and environmental load information, identify structural defects in design and construction, and diagnose and evaluate structural damage in operation. With the cluster development of the bridge structure operation safety monitoring system, many bridges in the regional road network or urban ring have established the structure operation safety monitoring system, that is, the bridge cluster structure operation safety monitoring system has been established. However, the existing methods all use the structural response mo...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06K9/62
CPCG06T7/0002G06T2207/30168G06F18/23
Inventor 刘洋张绍逸孙杰许庚陈允泉
Owner JINAN URBAN CONSTR GRP