Based On Wavelet Transient Power Spectrum Analysis And Seismic Wave Selection

In the vibration table simulation test and the seismic design,the traditional selected wave method according to the preset information specification,select several actual earthquake records of natural wave,due to the diversity of the seismic wavelet sample,to selected suitable seismic wave need large workload and seismic wavelet sample sometimes can not meet the structural characteristics.To solve this problem,this paper attempts to establish a more comprehensive consideration of the energy characteristics of the ground motion and the distribution seismic wave selection to study the dynamic response of the ground motion of different buildings.Around this theme,this paper has done the following work:(1)From the sym N(N=2,...10)wavelet function and DbN(N=2,...10)wavelet function,a total of 18 wavelet function,respectively analysis tools of wavelet function of seismic signal error and similarity,evaluation optimization wavelet function,is to use wavelet analysis to vibration signal of wavelet function choice to provide a theoretical basis(2)Using the wavelet decomposition of the EL Centro wave and Ninghe wave multi-scale instantaneous power and analysis of seismic wave in the frequency of the instantaneous energy distribution,proportion of energy in each frequency component distribution of and each different frequency in order to more intuitive and convenient features of seismic waves signal extraction.(3)According to the distribution of the transient energy of seismic wave,the distribution degree of the instantaneous energy and major energy distribution characteristics,combined with the structure of the self vibration characteristics extracting and restructuring wave,analysis to reconstruct wave acceleration spectrum and velocity spectrum and displacement spectrum.Compared with the original wave,the reconstructed wave is better fitted to the standard spectrum,which avoids the trouble of selecting proper seismic waves and combined with the standard synthetic artificial wave.