饱和土场地-桩基-地上结构体系的地震响应研究

Research on the dynamic responses of saturated porous media-pile foundation-superstructure system

饱和土场地-桩基-地上结构体系中,饱和土与结构分别具有不同控制方程和计算方法,造成有限元计算的不便。基于Client-Server技术,通过两个子程序分别计算饱和土和桩基-上部结构的动力响应,并利用土体和结构的共同节点传递两者间的作用力与位移,建立了一套求解饱和土-结构相互作用问题的交互式计算方法,其中饱和土采用基于u-p(其中u表示固相位移,p表示孔压)方程的全显式时域积分法求解,有效提高计算效率。最后,通过与Newmark法的数值结果进行对比,验证了提出方法的正确性,并说明该方法可以应用于求解饱和土场地-桩基-地上结构体系的地震响应问题。

In the saturated soil-pile foundation-superstructure system, different controlling equations and temporal integrator methods of pile foundation, superstructure and saturated soil lead to inconvenient calculation by using the finite element method. An interactive computational method for the saturated soil-structure interaction problem is developed using on the Client-Server technique. In this method, the dynamic responses of the saturated soil subsystem and pile foundation-superstructure subsystem are calculated in two subroutines respectively. The forces and displacements are transferred by common nodes of the two subsystems. The completed explicit temporal integrator method is introduced to determine the u-p relationship of the saturated soil subsystem. It significantly improves the computational efficiency. In numerical example, the proposed method is compared with the Newmark method. And the proposed method is demonstrated as an effective tool to solve the seismic responses of the saturated soil site-pile foundation-superstructure system.