分析了大量现有的共同作用理论，分别整理了上部结构、筏板与桩土的分析模式。
The theories of interaction are summarized and analytical models of raft, pile-soil and superstructure are settled respectively.
研究结果表明，考虑地基土、砂砾石垫层、上部结构共同作用时，结构的基本频率明显减小，相应的基本周期明显延长；
The results shows that the fundamental frequency of the model which takes the combined activate into consideration reduced evidently, and the fundamental period prolonged evidently.
但事实上，地基土与结构是共同作用的，在动力荷载作用下，两者的协同工作也被广大的设计人员接受。
But actually, the soil works together with the structure, and the cooperation of the two under dynamic loads is widely accepted by designers.
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