The Appliance of Wavelet Transform in the Analysis of Seismic Structure Dynamic Reliability
نویسندگان
چکیده
With good time-frequency discrimination ability and flexible time-frequency windows, wavelet transform is now widely used to analysis various signals in time and frequency domain simultaneously. Because of the simple relation between wavelet spectra and local (evolutionary) power spectra of a signal, a new method based on wavelet transform to estimate the local power spectra of earthquake ground motions is put forward. With the local power spectra (LPS) acquired, the LPS of structural response are calculated by numerical integral and the dynamic reliability of the structure based on the first passage criterion is estimated. It is proved that the local power spectra estimated by wavelet transform are accurate to reflect the time-frequency characteristics of earthquake ground motions. Wavelet transform may improve the traditional spectrum analysis to time-frequency analysis.
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