A reduction approach to seismic time history analysis by using time-frequency joint method

Time-frequency joint method is used to analyze the energy distribution of seismic time history in time-frequency domain.Since the main part of the energy is located in low frequency component and specific time,the time history is reconstructed by low sampling rate in certain time,and the calculation burden is reduced.Numerical experiment results show that the approach is effective and the deviation caused by it is no more than 5 percent,which is acceptable to engineering application.