As the intensity index of ground motion, PGA (peak ground acceleration) is often employed and analyzed.

作为地震动强度指标，峰值加速度一直是研究最多的物理量。

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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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