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发布时间：2019-03-11

论文类型：会议论文

发表时间：2010-07-25

收录刊物：Scopus、EI

卷号：8

页面范围：5949-5958

摘要：As an effective time-frequency analysis tool, wavelet transform is commonly used in damage detection of civil infrastructures to ambient vibration, wind or earthquake through identifying the frequency variation of structures. However, accurate identification results always can not be obtained in the case of earthquake excitation because of frequency contamination of quake. To solve this problem, a new damage detection and evaluation method using transfer function in wavelet domain is proposed in this paper. The new method is called the wavelet energy transfer function spectrum (WETFS). The frequency variation of structures during earthquake is identified by this method without frequency contamination of earthquake. The structural damage is then evaluated through changes in structural frequencies. Another advantage of this method is that it requires minimum sensor number on buildings. The WETFS method is applied for damage detection and evaluation of a 6-story actual masonry building in Guangyuan city, Sichuan province, China. This building was slightly damaged in the Wenchuan earthquake occurred in May 12, 2008. A monitoring system was installed on the building after Wenchuan earthquake and the structural seismic responses under total 10 aftershocks were measured. The natural frequency of this building is identified decreasing 7.9% and 8.31% during the Oct 24 and Dec 10 aftershocks by means of the WETFS method, and that means structural damage of this building further deteriorated in these two aftershocks.