Numerical analysis of seismic response based on infinite element and wave field separation method

Abstract:

This paper uses the infinite element to model the far field and the finite element to model the near field of foundation, and the equivalent load is artifically applied to the interface between the finite element and the infinite element to replace the seismic action. The seismic response of semi-infinite foundation are then simulated. Numerical results show that the proposed methodology based on the infinite element and the equivalent load method is feasible and can effectively simulate the process of wave propagation in semi-infinite foundation. Besides, the effect of gravity on the seismic response of free field is analyzed. Finally, the effect of soil-structure interaction on seismic response is also investigated via an engineering example of nuclear plant foundation.