Method for judging and positioning bridge cable corrosion

Abstract

The invention discloses a method for judging and positioning bridge cable corrosion. The method comprises the following steps of: arranging a sensor on a cable to be detected, acquiring an actual measured signal by using the sensor and reading the signal into a laptop by using a data acquisition card; establishing a fine numerical model for the cable corrosion judgment by adopting the finite element technology according to geometric dimension, material characteristics and excitation signal conditions of the cable, initializing the numerical model, analyzing and calculating to obtain a simulation response signal, and providing a standard comparison signal for the actual measured signal; using the actual measured signal as a judgment signal of the cable corrosion, and comparing the judgment signal and the standard comparison signal and analyzing the judgment signal by adopting a neural network analysis method, if the damage does not exceed a threshold value, judging that the cable is not corroded, otherwise alarming and positioning the corroded part; generating a recording report and recording a local database. The method for judging and positioning the bridge cable corrosion has the advantages of high resolution, high judging precision and no influence on normal use of the cable.

Description

technical field [0001] The invention relates to non-destructive testing technology, in particular to a method for judging and locating bridge cable corrosion. Background technique [0002] Bridge cables are important structural parts for load-bearing and force transmission in bridges. During long-term use, they are constantly eroded by external environments such as temperature changes and strong winds, and the long-term repeated effects of vehicle loads and impacts as well as natural disasters. Corrosion or breakage of the steel wire will bring serious safety hazards to the bridge. Traditional non-destructive testing methods such as electromagnetic, ultrasonic flaw detection, machine vision or ray all require a cable climbing mechanism for scanning detection, which has complex mechanisms and the ability to work at heights. Poor, narrow scope of application, high failure rate, inconvenient to carry probes, harsh conditions of use, etc. Patent No. 200810196821.1 A magnetostric...

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Problems solved by technology

[0002] Bridge cables are important structural parts for load-bearing and force transmission in bridges. During long-term use, they are constantly eroded by external environments such as temperature changes and strong winds, and the long-term repeated effects of vehicle loads and impacts as well as natural disasters. Corrosion or breakage of the steel wire will bring serious safety hazards to the bridge. Traditional non-destructive testing methods such as electromagnetic, ultrasonic flaw detection, machine vision or ray all require a cable climbing mechanism for scanning detection, which has complex mechanisms and the ability to work at heights. Poor, narrow scope of application, high failure rate, inconvenient to carry probes, harsh conditions of use, etc. Patent No. 200810196821.1 A magnetostrictive guided wave detection system for cable anchorage areas The detection of the cable, but there is no relevant method for the judgment of corrosion

He Cunfu and others used the dispersion compensation method to locate the acoustic emission, but the calculation of dispersion compensation is complicated and the accuracy is not high

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