A simplified technique to obtain foundation input motions for circular cylindrical foundations embedded in the ground and subjected to seismic motion is presented.

埋置基础输入运动的求解是采用子结构法进行土与结构相互作用的关键问题之一。

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The paper presents a foundation parameters identification method under the condition of unknown motion input from the base rock.

提出了一种基岩输入运动未知条件下的层状地基参数的时域识别方法。

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Then some rules are presented: the frequency characteristics, acceleration peak value of the input ground motion have great influence on the seismic response of composite foundation.

结果表明：输入地震动的强度和频谱特性对复合地基地震效应影响较大；

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