Abstract: 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.

Key words: OpenSees, saturated soil-structure interaction, completed explicit finite element method, Client-Serve