前言六十年代以来,曾广泛地进行地震作用下土与结构的动力相互作用的研究。尽管在最近二十年内,提出了很多求解这个问题的方法与技巧,但几乎所有这些方法都可认为是以下述两种基本方法之一为基础:即直接法(一步法)和子结构法。直接法的表示公式易懂,而子结构法则沿两 Foreword Since the 1960s, the dynamic interaction between soil and structure under the action of earthquakes has been extensively studied. Although in the last two decades many methods and techniques for solving this problem have been proposed, almost all of these methods can be considered to be based on one of the following two basic methods: the direct method (one-step method) and the substructure method. The expression formula of the direct method is easy to understand, and the substructure rule is along the two