Evaluation of earthquake-induced structural damages by wavelet transform

查看全文 作　　者：Hongnan [1]Li;Tinghua [1,2]Yi;Ming [2]Gu;Linsheng [1]Huo

机构地区：[1]State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, School of Civil and Hydraulic Engineering, No. 2 Linggong Road, Ganjingzi District, Dalian, Liaoning Province 116024, China;[2]State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China

出　　处：《Progress in Natural Science:Materials International》索引2009年第19卷第4期,共10页

基　　金：supported by the Program for Changjiang Scholars and Innovative Research Team in University (No. IRT0518);the 111 Project (No. B08014);Natural Science Foundation of China (No. 50708013);the Research Fund for the Doctoral Program of Higher Education (No. 20070141036);the China Postdoctoral Science Foundation Project (No. 20070420113);the OpenFund of Liaoning Province Key Laboratory of Structural Engineering, Shenyang Jian Zhu University (No.JG200718) 摘　　要：The dynamic behavior of inelastic structures during an earthquake is a complicated non-stationary process that is affected by the ran- dom characteristics of seismic ground motions. The conventional Fourier analysis describes the feature of a dynamic process by decom- posing the signal into infinitely long sine and cosine series, which loses all time-located information. However, both time and frequency localizations are necessary for the analysis of an evolutionary spectrum of non-stationary processes. In this paper, an analytical approach for seismic ground motions is developed by applying the wavelet transform, which focuses on the energy input to the structure. The procedure of identification of the instantaneous modal parameters based on the continuous wavelet transform (CWT) is given in detail. And then, a novel method using the auto-regressive moving average (ARMA), called ''prediction extension', is presented to remedy the edge effect during the numerical computation of the CWT. The effectiveness of the method is verified by the use of the benchmark model developed by the American Society of Civil Engineers (ASCE). Finally, a scale model with three-storey reinforced concrete frame-share wall structure is made and tested on a shaking table to investigate the relation between the dynamic properties of structures and energy accumulation and its change rates during the earthquake. The results have shown that the wavelet transform is able to provide a deep insight into the identity of transient signals through time-frequency maps of the time variant spectral decomposition. 关键词：连续小波变换地震地面运动结构损伤土木工程师学会 FOURIER分析 ARMA模型框架剪力墙结构非平稳过程

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Evaluation of earthquake-induced structural damages by wavelet transform

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