【摘要】 地震动时频局部特性很强,在不同的时刻及不同的频率段,其能量差别很大.本文根据谐波小波的时频特性,通过地震动的多尺度小波变换,可以得到的不同频段的时变能量表达式,最后通过分析一实际的时频非平稳明显的强震记录,得到结果表明:低频的地震能量较小,且分布在整个时段内,能量衰减也不明显;中频的初始时段的地震能量较大,其衰减较快;高频的地震能量最大,且分布在初始的时段内,能量衰减很快.结果为能量法进行结构设计的提供了基础.更多还原

【Abstract】 For Seismic have its own time-frequency localization characteristics,in other words,the energy is variable with time and frequencies.In this paper,according to the time-frequency characteristics of harmonic wavelet,the different frequency bands of the time varying energy expression was given by the ground motion of multi-scale wavelet transform,finally,a practical strong motion record which owned its time-frequency non-stationary characteristics has been analyzed,the results show that: not only seismic energy which distributes with the whole period of time at low frequency is smaller,but also energy attenuation is not obvious;seismic energy of intermediate frequency at the initial time is bigger with its rapid attenuation;seismic energy of high frequency is the biggest with the initial period,which decreases rapidly with time.The energy method in the paper provides a theory basis for structural design.更多还原