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Two-stage detection method and system for structural corrosion based on rapid vibration test

A technology of vibration testing and detection methods, which is applied in the processing of detection response signals, and the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., to achieve the effects of strong anti-noise ability, less test time, fast positioning and quantification

Active Publication Date: 2021-07-23
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention is aimed at the deficiencies of the prior art in terms of corrosion location and quantification, and provides a fast-vibration-based two-stage strategy structure corrosion detection method and its system. The strain compliance of the structure is judged, and the corrosion location is located by using the strain compliance difference of the structure before and after corrosion, so as to realize the corrosion location problem in the first stage; after the corrosion location is determined, the unknown parameters of the structure to be identified are reduced from the stiffness of all units to For the stiffness of the corrosion unit, establish a sensitivity matrix based on the long gauge strain compliance to the stiffness of the structural section, solve the stiffness of the structural unit according to the sensitivity function and the overall stiffness matrix of the structure, and judge the amount of corrosion according to the change of the stiffness, which is mostly used for the current safety status assessment of the structure And long-term performance evaluation, high test accuracy, strong anti-noise ability, can realize long-term monitoring of structural corrosion

Method used

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  • Two-stage detection method and system for structural corrosion based on rapid vibration test
  • Two-stage detection method and system for structural corrosion based on rapid vibration test
  • Two-stage detection method and system for structural corrosion based on rapid vibration test

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Embodiment 1

[0062] A two-stage strategy for structural corrosion detection based on rapid vibration, including the following steps:

[0063] S1, based on the impact force time history under impact vibration and the response of the long gauge FBG sensor fixed on the structure surface, the structural strain compliance is identified;

[0064] S11, record the impact force and long gauge strain response under shock vibration, and determine the long gauge strain FRFs;

[0065] S12, the basic structural parameters are identified by the complex modulus indicator function method, and the singular value decomposition (SVD) is applied to the long-strain FRFs to obtain:

[0066]

[0067] in and are the left singular vector and the right singular vector respectively, which are the singular value matrix composed of frequency information and damping information; U L is the left singular vector, including the mode shape information of the left nodes of all elements; U R is the mode shape informa...

Embodiment 2

[0111] The difference between this embodiment and Embodiment 1 is that when the structure to be tested is a steel structure, the change in element stiffness can be used as an index for quantitative corrosion, and the amount of corrosion can be directly judged by the stiffness of the structural element obtained from the solution in step S5 ; When the structure to be measured is a reinforced concrete structure, step S6 is also included, according to the nonlinear stage stiffness calculation formula Solve the current reinforcement area and corrosion area of ​​the structure to be tested, and judge the amount of corrosion.

Embodiment 3

[0113] A two-stage strategy for structural corrosion detection systems based on rapid vibration, such as figure 1 As shown, in this embodiment, the system is used for bridge experiments as an example, including a rapid inspection vehicle equipped with an impact device, a data acquisition system and a data analysis system;

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Abstract

The invention discloses a two-stage detection method and system for structural corrosion based on rapid vibration testing. The strain compliance of the structure is judged according to the strain response of the long gauge FBG sensor and the time history of the impact force, and the strain compliance of the structure before and after corrosion is used. Corrosion locations can be located in order to realize the corrosion location problem in the first stage; after the corrosion location is determined, the unknown parameters to be identified in the structure are reduced from the stiffness of all elements to the stiffness of corrosion elements, and the relationship between structural section stiffness and structural section stiffness based on long gauge length strain flexibility is established. According to the sensitivity matrix, the stiffness of the structural corrosion unit is solved according to the sensitivity equation, and the corrosion amount is judged according to the change of the stiffness; at the same time, the rapid detection vehicle equipped with the impact device, the data acquisition system and the data analysis system form a two-stage strategic structural corrosion detection system based on rapid vibration , mostly used for the current safety status assessment and long-term performance assessment of the structure, with high test accuracy and strong anti-noise ability, and can realize long-term monitoring of structural corrosion.

Description

[0001] Field [0002] The invention belongs to the technical field of traffic structure health monitoring, and relates to a rapid positioning, quantification and safety state evaluation technology for pavement structure corrosion, in particular, to a two-stage detection method and system for structural corrosion based on rapid vibration testing. Background technique [0003] As we all know, the infrastructure of various countries in the world is huge and plays an important role in national economic life. However, during the long service period of infrastructure, due to environmental erosion, daily service loads and even overloading, the structural performance gradually degrades and Extreme natural disasters such as earthquakes and typhoons may occur at any time. Therefore, more and more people are paying attention to the performance evaluation of bridges to ensure structural safety and optimize maintenance and management costs. [0004] Corrosion of steel bars has been recogni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/44G01N29/04
Inventor 张建程玉瑶赵晨阳
Owner SOUTHEAST UNIV
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