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近年来,地震动的概率描述方法已逐渐引起研究人员的广泛重视,有些方法已为美国、加拿大等国家抗震规范所采用,我国目前也正在编制具有概率意义的地震危险性区划图。地震动的概率描述导致并促进了结构抗震设计向动力可靠性设计方向发展。目前在工民建结构抗震设计中已开始采用动力可靠性设计方法,但在地基及土石坝中应用还很少,受限制的一个重要原因是缺乏简便有效地计算大体积强非线性的地基或土石坝随机地震反应方法。以往为数不多的地基、土石坝随机地震反应计算,主要采用的线性分析模型,有的虽然采用等价线性化法进行近似计算,也不得不引入许多限制条
In recent years, the probabilistic description methods of ground motions have gradually attracted the attention of researchers. Some methods have been adopted for earthquake-resistance regulations in countries such as the United States and Canada. China is currently compiling seismic hazard zoning maps with probabilistic significance. The probabilistic description of ground motions has led to and promoted the development of structural seismic design to dynamic reliability design. At present, the dynamic reliability design method has been adopted in the seismic design of civil-industrial structures, but it is rarely used in foundations and earth-rock dams. One important reason for the limitation is the lack of simple and effective calculation of large volume and non-linear foundations or Random seismic response method for earth-rock dams. In the past, there were few calculations for the random seismic response of foundations and earth-rock dams. The linear analysis models used mainly, while some used the equivalent linearization method for approximate calculation, had to introduce many restrictions.