Structure corrosion two-stage detection method and system based on rapid vibration testing

Abstract

The invention discloses a structure corrosion two-stage detection method and system based on rapid vibration testing, and the method comprises the steps: judging the strain flexibility of a structureaccording to the strain response and impact force time history of a long-scale-distance FBG sensor, positioning a corrosion part through employing the strain flexibility difference of the structure before and after corrosion, and achieving the corrosion positioning of a first stage; after the corrosion part is determined, reducing the rigidity of the unknown parameter to be identified of the structure from the rigidity of all units to the rigidity of the corrosion unit, establishing a sensitivity matrix for the structural section rigidity based on the long gauge length strain flexibility, solving the rigidity of the structural corrosion unit according to a sensitivity equation, and judging the corrosion amount according to the rigidity change; meanwhile, forming a two-stage strategy structure corrosion detection system based on rapid vibration by a rapid detection vehicle, a data acquisition system and a data analysis system which are matched with an impact device, wherein the two-stage strategy structure corrosion detection system is mainly used for current safety state evaluation and long-term performance evaluation of the structure, high in test precision and high in noise resistance, and can realize long-term monitoring of structure 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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