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

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...

AI Technical Summary

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

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