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分析了在桩尖处地震动输入下上海广播电视塔－群桩－土相互作用体系的桩承台水平地震反应问题．对群桩－地基土相互作用分析，采用了较为简便而实用的三维波动方程解的半解析方法的结果．在分析桩－土－承台体系的动力特性时，将承台以上的结构简化成一个动力等效的单自由度体系．最后给出了承台水平地震反应的时程曲线，作为上部结构地震反应分析时的有效地震输入．
Analyzed the horizontal seismic response of the pile platform of the Shanghai Radio and TV Tower-Pile-Soil interaction system under the ground motion input at the pile tip. For the analysis of pile group-foundation soil interaction, the results of the semi-analytical method of simple and practical three-dimensional wave equation solution are adopted. When analyzing the dynamic characteristics of the pile-soil-cone platform, the structure above the platform is reduced to a single-degree-of-freedom system with dynamic equivalent. Finally, the time history curve of the horizontal seismic response of the cap is given as an effective seismic input for the seismic response analysis of the superstructure.