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中文摘要：
基于物理联系研究地震动随机性，建立了随机地震动与基底输入傅氏谱、场地固有圆频率和场地等价阻尼比之间的物理关系，从随机傅氏谱函数角度描述了地震动随机过程的随机性本质。结合Ⅳ类工程场地的实测地震动记录资料，由数值方法识别了给出基本随机变量的概率分布参数。与实测记录对比表明，本文建立的随机地震动模型具有明确的物理概念，可充分反映地震动的变异性特征。
英文摘要：
In this paper, based on the physical relationship, the random character of earthquake ground motion is studied. The physical relation between the random parameters and the random earthquake ground motion are established, and these parameters include the input spectrum parameter, the free frequency and the damping ratio of sites. By using the random Fourier spectra the randomness of earthquake ground motion is described. A large number of earthquake records are introduced to identify the probability distribution of these physical parameters. Comparison with real records shows that the suggested model not only has clear physical concept, but also can reflect the variability character of the earthquake ground motion adequately.
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