Rigid pile composite foundation has been widely applied in structures.However

researches on seismic performance under earthquake loading are very inadequate.Referring to the code for seismic design of buildings

an artificial earthquake wave is generated by a standard response spectrum of rare earthquake with intensity 8.Via earthquake response of a ten-story reinforced concrete frame structure in soft ground

seismic performance of the rigid pile composite foundation is analyzed in this paper.Internal force of a pile is separately influenced by deformation of free-field response and the inertia force of super-structure.A pseudo-static simplification method is proposed based on the above assumption for this kind of foundation.Then numerical analysis method is used to establish a whole finite element model of a rigid pile composite foundation-raftsuperstructure system and dynamic time-history analysis on the model is carried out to verify the pseudo-static method.The effect of free-field displacement on piles and seismic response of the whole finite element model are analyzed in this paper.Besides

seismic response of piled raft foundation and composite foundation under the same conditions is compared in this paper.It is shown that results of the pseudo-static method are close to those of the numerical analysis method.Internal forces and peak accelerations on the raft bottom of the composite foundation are all less than those of the piled raft foundation.The cushion has a filtering effect on seismic waves to reduce the impact of earthquakes.