高层结构-桩-土共同作用的地震反应分析

Seismic response analysis of highrise buildings including structure-pile-soil interaction

采用边界元特解样条函数提出了桩－土与上部结构共同作用的动力分析方程,分析了土桩刚度与阻抗的计算方法;指出在共同作用下,结构的动力特性发生了变化,结构自振频率减小,上部结构的位移、加速度分布不同于传统的以第１振型为主的倒三角形分布,而随着地基土软弱程度的加重而越来越接近Ｋ型分布的特性。

By means of spline and particular solution boundary element, dynamic equations of struc-ture-pile-soil interaction are suggested. Calculation methods for impedance function of pile-soil system are analyzed. The Calculated results show that the frequency of the structure is decreased and that the distribution of displacement and acceleration of the structure is different from that of traditional one. It appears as 'K' shape distribution with increasing compliance of foundation soil instead of an inverted triangle distribution.