【Key words】 Ground Motion Input； Soil-Structure Interaction； ANSYS； Artificial Boundary； Tall Building； Pile；
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It is of great importance to consider seismic response analysis of site soil for determining ground motion input mode of the upper structure and the safety estimation of earthquake resistant.
场地土层地震反应分析对确定上部结构的地震动输入模式和进行抗震安全性评价具有重要意义。
The results show that there are great difference between the earthquake responses of double and single tower high-rise buildings, this related to the input ground motion and sites.
结果表明：深厚软弱地基上双塔和单塔高层建筑的地震反应有很大差别，这种差别与场地条件和输入地震动特性有关。
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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