多点地震动作用下结构随机地震反应的计算十分耗费时问。
The random response computation of structures under multiple-support excitations is a problem of time consumption.
基于模态摄动方法，提出了层状土层随机地震反应的近似分析方法。
Based on modal perturbation method, a new approach is developed for solving the random seismic response of horizontal layered soil.
工程结构的随机地震反应分析，常在频域中用到地震动的功率谱密度函数。
The power spectral density function of earthquake motion is usually used for the random response analysis of engineering structures in the frequency domain.
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