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A Closed-loop Bridge Structural Damage Diagnosis Method Based on Distributed Strain Measurement Technology

A technology of distributed strain and bridge structure, applied in measurement devices, machine/structural component testing, elasticity testing, etc., can solve problems such as low structural damage sensitivity, meet stability requirements, improve completeness, and improve sensitivity Effect

Active Publication Date: 2020-05-12
JINAN URBAN CONSTR GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of low sensitivity of existing open-loop damage diagnosis technology to structural damage, a closed-loop bridge structural damage diagnosis method based on distributed strain measurement technology is proposed

Method used

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  • A Closed-loop Bridge Structural Damage Diagnosis Method Based on Distributed Strain Measurement Technology
  • A Closed-loop Bridge Structural Damage Diagnosis Method Based on Distributed Strain Measurement Technology
  • A Closed-loop Bridge Structural Damage Diagnosis Method Based on Distributed Strain Measurement Technology

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specific Embodiment approach 1

[0021] Specific implementation mode one: refer to Figure 7 Specifically illustrate the present embodiment, the closed-loop bridge structure damage diagnosis method based on the distributed strain measurement technology described in the present embodiment, the method includes the following steps:

[0022] Step 1: For the bridge structure under study, establish a finite element model in a healthy state, extract its initial stiffness matrix and initial mass matrix, and apply a certain non-feedback excitation to the bridge structure at the same time, collect vibration signals, and analyze the The model is corrected for the structure, and the corrected stiffness matrix and the corrected mass matrix are obtained;

[0023] Step 2: Using the structurally modified stiffness matrix and modified mass matrix obtained in step 1, use closed-loop technology to construct a closed-loop system, and combine the requirements of observability and output controllability to solve the feedback excit...

specific Embodiment approach 2

[0030] Specific embodiment 2: This embodiment is to further explain the closed-loop bridge structure damage diagnosis method based on distributed strain measurement technology described in specific embodiment 1. In this embodiment, the bridge structure model correction method described in step 1 is as follows: :

[0031] Step 11: According to the structural parameters of the bridge in a healthy state, an initial finite element model of the structure is established, and the initial stiffness matrix K of the structure is extracted chu and the initial mass matrix M chu ;

[0032] Step 1 and 2: Apply non-feedback excitation w(t) to the bridge structure, collect vibration signals, and perform spectrum analysis to extract the first few natural vibration frequencies {ω 1 ,ω 2 ,ω 3 ,...};

[0033] Step 13: Use the natural frequency {ω calculated in step 12 1 ,ω 2 ,ω 3 ,…} as the correction target, the model correction is carried out on the established finite element model, so ...

specific Embodiment approach 3

[0037]Specific embodiment three: This embodiment is a further description of the closed-loop bridge structure damage diagnosis method based on distributed strain measurement technology described in specific embodiment one. In this embodiment, the observability of the closed-loop system described in step two and The output controllability requirements are:

[0038] Step 21: Use the structure obtained in step 1 to modify the stiffness matrix K xiu and the modified mass matrix M xiu , construct the state space equation of the bridge structure, and introduce feedback excitation to establish a closed-loop system:

[0039]

[0040] In the formula, Z is the structural state vector; is the derivative vector of the state vector; U is the feedback excitation; w is the non-feedback excitation; A is the structural system matrix; u is the feedback excitation distribution matrix; B w is the non-feedback excitation distribution matrix; K c is the feedback gain matrix; C is the measu...

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Abstract

The invention belongs to the field of bridge structure damage diagnosis in actual operation, particularly relates to a closed-loop bridge structure damage diagnosis method based on a distributed strain measurement technology, and belongs to the field of damage diagnosis during the actual bridge structure operation. According to the invention, an active excitation is introduced, appropriate closed-loop poles are selected, and a singular value decomposition method is used for calculating a feedback gain, so that a closed-loop system is constructed; and a closed-loop system characteristic value with high damage sensitivity is used for constructing a damage index, so that the damage diagnosis is realized. The closed-loop bridge structure damage diagnosis method based on the distributed strainmeasurement technology can effectively improve the sensitivity of the damage index to structural small damage in the damage diagnosis, and is suitable for solving the problem of bridge structure damage diagnosis in actual operation.

Description

technical field [0001] The invention belongs to the field of bridge structure damage diagnosis in actual operation, and in particular relates to a closed-loop bridge structure damage diagnosis method based on distributed strain measurement technology. Background technique [0002] In order to ensure the normal operation of the bridge structure and prevent serious consequences caused by structural damage or even destruction, it is necessary to use effective technical means to accurately evaluate the state of the bridge structure and diagnose structural damage during operation in a timely manner. When the bridge structure is damaged, its dynamic characteristics, static characteristics and other characteristic parameters will change, and the essence of damage diagnosis is to identify the change by analyzing the structural response, and further locate and identify the degree of structural damage through comparative analysis. With the emergence of advanced measurement technology ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M5/00
CPCG01M5/0008G01M5/0033G01M5/0041
Inventor 刘洋周正孙杰许庚张绍逸
Owner JINAN URBAN CONSTR GRP