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Date:2022-08-29

Date of Publication:2019-01-01

Journal:振动与冲击

Institution:建设工程学部

Volume:38

Issue:21

Page Number:37-43

ISSN:1000-3835

Abstract:Damage identification is an important problem for a concrete dam's safety evaluation after strong earthquake, while its damage development process or its failure process developing path are also valuable for its safety evaluation. Here, several novel methods utilizing time history data of the dam's seismic response were proposed to identify its damage locations, damage level and time sequence of initial damage in different parts based on wavelet transform's correlation analysis idea and technique. A damage threshold value index sk was proposed to recognize initial damage time instants based on the moving time window. The effectiveness of the proposed methods was verified through finite element simulation and shaking table model tests. Results showed that the damage early warning index based on the moving time window can clearly identify initial damage time instants; the wavelet transform is used to decompose a signal into signal values in different frequency bands, detect the signal's singular points, and determine damage locations and time sequence of initial damage in different parts. ? 2019, Editorial Office of Journal of Vibration and Shock. All right reserved.

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