Monitoring system and method for cable fatigue damage of cable-stayed bridge based on magnetic field

Abstract

The invention discloses a cable-stayed bridge cable fatigue damage monitoring system and method based on a magnetic field. The monitoring system measures the stress amplitude, cycle index and a damage position of cable fatigue damage by enabling a fatigue damage probe to move along a cable, can quantitatively realize cable fatigue damage monitoring, solve the problem that quantitative monitoring cannot be realized during the magnetic field monitoring of cable-stayed bridge cable fatigue damage, does not need to remove rust oil stain, paint and plating of the surface of a component to be detected, can perform detection by keeping the original appearance of the component, does not need to apply magnetizing equipment, and computes the safety factor and a damage position of cable fatigue damage through a data control system according to the variation magnetic induction intensity, so as to perform early warning on cable fatigue damage. The monitoring system is small in quantity of required equipment, simple in layout and accurate in monitoring.

Description

technical field [0001] The invention relates to a magnetic field-based monitoring system and method for cable fatigue damage of cable-stayed bridges. Background technique [0002] The cable is an important part of the structural system of the cable-stayed bridge. It is the key and important stress-bearing member in the cable-stayed bridge. Components that are prone to damage or destruction. The damage or destruction of the cables will have a significant impact on the structure of the cable-stayed bridge and even lead to serious catastrophic consequences. It is the bottleneck to prolong the service life of the cable-stayed bridge structure. During the operation of the cable-stayed bridge, under the action of vehicle load, earthquake, wind, rain, etc., the cables will undergo severe vibration and corresponding fatigue damage, which will inevitably lead to damage, performance degradation, and even fracture in severe cases. Cause serious catastrophic accidents and produce adve...

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Problems solved by technology

[0005] In view of the deficiencies in the prior art, the technical problem to be solved in the present invention is to provide a magnetic field-based cable-stayed bridge cable fatigue damage monitoring system and method, which can solve the problem of vehicle load, earthquake, wind, rain, etc. The problems that cannot be quantitatively monitored in the fatigue damage monitoring of cable-stayed bridges under dynamic loads can be monitored while maintaining the original appearance of the cable components, and the stress amplitude and cycle times of the fatigue damage of the cables are given, so as to accurately give The safety factor and damage location of cable fatigue damage can achieve cable-stayed bridge fatigue damage monitoring and early warning

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