A finite element analysis for soil-pile-structure interaction for dynamic loads has been presented. The proposed model for the soil-pile-structure (SPS) system consists of two subsystems: a structure subsystem and a pile-foundation subsystem. Seismic response of the system is found using a successive-coupling incremental solution scheme. Material nonlinearity of soil is introduced using, an advanced plasticity based model, HiSS. Proper boundary conditions, simulating radiation effects are used. Both a single pile and a pile group are considered. Effects of nonlinearity on the pile head response and on the response of the structure are investigated. Both harmonic and transient motions are considered in the analyses. It is observed that nonlinearity significantly affects seismic response of pile foundation as well as that of the structure. Effects of nonlinearity on response are dependent on the frequency of excitation with nonlinearity causing an increase in response at low frequencies of excitation. However its effects are not significant at high frequencies.
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