通过实测记录改进空间地震动强度非平稳性

Research on improving the intensity non-stationarity of spatial ground motion by measured records

针对空间地震动模拟强度非平稳化时容易造成合成地震动波形与实测记录存在较大差异的问题,本文通过引入实测记录,将规范中的目标设计谱分解为实测记录反应谱及两者之间的校正项,以此合成的地震动波形与实测记录相近。首先通过一算例对该法进行详细描述,在此基础上研究了不相干效应、行波效应对结果的影响。结果表明所合成结果与实测记录相似且满足相干性,而不相干效应变化时对结果的影响要强于行波效应。

For the larger waveform difference between simulated ground motion and measured records during unsteady spatial ground motion,it is considered that the target design spectrum in the design code can be decomposed into the measured response spectrum and the correction term between these two factors by introducing measured records.This allows the simulated result to be close to the measured records.First,an example is given to describe the method in detail,then the influences of the incoherence and wave passage effects on the result are studied.It is found that the synthesized result is similar to the measured records and satisfies the coherence,and that the influence of the incoherence effect on the result is stronger than that of the wave passage effect.