基于相位差谱合成时频非平稳地震波

人工合成满足工程需要的地震波一直是动力分析中的重要课题。分析了实测波相位角和相位差的分布形式。介绍了基于相位差谱合成人工波的过程,包括初始波生成、初始波修正和基线修正。并以此编制人工地震波合成程序。利用已有地震波的相位差谱和反应谱合成新地震波,得到的地震波与原地震波趋势十分相似。验证了该方法的可行性和程序的正确性。最后结合实际工程,利用该方法合成满足工程需要的人工波。

The synthesis of time frequency non-stationary seismic wave based on phase difference spectrum

The synthesis of seismic wave which can satisfy the engineering demand is an important subject in dynamic analysis.The distribution forms of phase angle and phase difference is analyzed,and the process of synthesizing artificial waves based on the phase difference spectrum is introduced as well,including the initial wave generation,initial wave correction and baseline correction and then the program about the synthesis of artificial seismic waves is compiled.The new seismic wave is synthesized by the phase difference spectrum and response spectrum of a existing seismic wave and the wave is very similar to the existing one,proving the feasibility of this method and correctness of program.Finally,combined with practical engineering,the artificial wave which meets the engineering demand is synthesized by this method.