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Bridge structure damage diagnosis method based on accumulated damage factor sequence under complex environment

A technology of accumulating damage and bridge structure, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of low accuracy of bridge structure damage diagnosis methods, and achieve the effect of improving accuracy

Active Publication Date: 2014-08-13
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem of low accuracy of the bridge structure damage diagnosis method based on real-time monitoring data in complex environments, and now provides a bridge structure damage diagnosis method based on cumulative damage factor sequences in complex environments

Method used

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  • Bridge structure damage diagnosis method based on accumulated damage factor sequence under complex environment
  • Bridge structure damage diagnosis method based on accumulated damage factor sequence under complex environment
  • Bridge structure damage diagnosis method based on accumulated damage factor sequence under complex environment

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specific Embodiment approach 1

[0020] Specific implementation mode one: refer to Figure 7 Specifically illustrate this embodiment, the bridge structure damage diagnosis method based on the cumulative damage factor sequence under the complex environment described in this embodiment, the method includes the following steps:

[0021] Step 1: Collect the real-time monitoring data of the bridge structure under the state to be diagnosed, and take the middle time point of the monitoring time as the dividing point, and divide the monitoring data into the previous time part and the later time part on average;

[0022] Step 2: Use the part of the monitoring data obtained in Step 1 to establish a data model of the bridge under the state of diagnosis;

[0023] Step 3: According to the part of the monitoring data obtained in step 1 and the bridge data model in the state to be diagnosed obtained in step 2, construct the cumulative damage feature vector of the bridge in the state to be diagnosed;

[0024] Step 4: Accord...

specific Embodiment approach 2

[0029] Specific embodiment two: This embodiment is to further explain the bridge structure damage diagnosis method based on the cumulative damage factor sequence in the complex environment described in specific embodiment one. The methods of the data model are:

[0030] Step 21: Set the monitoring data vector as y m×1 , the part of the monitoring data matrix obtained in step 1 is Y 1 =[y 1 ,y 2 ,...,y n ], then Y 1 The covariance of is defined as:

[0031] Σ = 1 n Σ i = 1 n ( y i - μ ) ( y i - μ ) T - - - ( 1 ) ...

specific Embodiment approach 3

[0037] Specific embodiment three: this embodiment is to further explain the bridge structure damage diagnosis method based on the cumulative damage factor sequence in the complex environment described in specific embodiment two. The method of accumulating damage eigenvectors is:

[0038] Step 31: Set another part of the monitoring data obtained in Step 1 as Y 2 =[y n+1 ,y n+2 ,...,y n+k ], then the monitoring data vector is:

[0039] y ^ j = y n + j - μ - - - ( 3 )

[0040] In the formula, j=1,2,...,k, and k is a positive integer;

[0041] Step 32: According to the data model {μ, U 2 ,S 2} and monitor data vector to be able to obtain the vector p j:

[0042] p j ...

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Abstract

The invention discloses a bridge structure damage diagnosis method based on an accumulated damage factor sequence under a complex environment, belonging to the field of bridge structure damage diagnosis in practical operation. The invention solves the problem of low accuracy of a bridge structure damage diagnosis method based on massive monitoring data under a complex environment. The bridge structure damage diagnosis method based on an accumulated damage factor sequence under a complex environment, disclosed by the invention, comprises the following steps: constructing a damage diagnosis threshold by adopting bridge structure monitoring data under a healthy state, and comparing an accumulated damage discrimination factor with a damage diagnosis threshold under states to be diagnosed at different moments so as to discriminate that whether a bridge structure is damaged or not. Meanwhile, by adopting a dependence scrambling strategy, the method disclosed by the invention is capable of eliminating influences of various environment factors to bridge structure monitoring data. The bridge structure damage diagnosis method is capable of improving the accuracy of bridge structure damage diagnosis under a complex environment condition, and is suitable for solving the problem of bridge structure damage diagnosis of the practical operation.

Description

technical field [0001] The invention belongs to the field of bridge structure damage diagnosis in actual operation. Background technique [0002] The bridge structure is an important hub connecting highways, and the safety of its structure plays an important role in ensuring the safety and smoothness of highway traffic. In order to ensure the safety, integrity and applicability of the bridge structure during operation, it is urgent to use effective technical means to accurately diagnose the change process of the bridge structure performance, so as to effectively diagnose the bridge structure damage. In recent years, with the rapid development of sensor technology, numerical simulation, and damage identification technology, structural health monitoring technology has been widely used in large bridge structures. Structural health monitoring technology can continuously and reliably provide bridge structure status and response information; identify various defects, deterioratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 刘洋王德军马俊张绍逸杨昌熙
Owner HARBIN INST OF TECH
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