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Abstract

To ensure the safe operation of bridge structures, this paper proposed a reference-free damage identification method for bridges. Meanwhile, the finite element method was adopted to solve the structural dynamic response of simply supported beams under different weights of moving loads. The time-wavelet energy spectrum of the structural acceleration response difference under different weights of moving loads was employed as the damage identification index for damage identification, with the effects of multiple damages, damage degrees, moving load speed, and noise on the identification results considered. The results show that under the action of moving loads of different weights, the peak position of the time-wavelet energy spectrum based on the structural acceleration response difference can help identify the damage to the main beam. The identification results of the actual bridge are in sound agreement with the static and dynamic load test results. The kurtosis of the time-wavelet energy spectrum increases with the rising damage degree, and employing the kurtosis of the time-wavelet energy spectrum as an evaluation index can effectively evaluate the degree of damage to the main beam. The damage index based on the time-wavelet energy spectrum is less affected by the location and damage number, and has strong noise robustness. Therefore, even in a strong noise environment with a signal-to-noise ratio of 5 dB, damage can still be effectively identified.

Publication Date

11-8-2022

DOI

10.14048/j.issn.1671-2579.2022.05.021

First Page

115

Last Page

119

Submission Date

April 2025

Reference

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