3-D FINITE ELEMENT NONLINEAR DYNAMIC ANALYSISFOR SOIL-PILE-STRUCTURE INTERACTION

摘要

A finite element analysis for soil-pile-structure interaction for dynamic loads has been presented. Theproposed model for the soil-pile-structure (SPS) system consists of two subsystems: a structure subsystemand a pile-foundation subsystem. Seismic response of the system is found using a successive-couplingincremental solution scheme. Material nonlinearity of soil is introduced using, an advanced plasticitybased model, HiSS. Proper boundary conditions, simulating radiation effects are used. Both a single pileand 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 nonlinearitysignificantly affects seismic response of pile foundation as well as that of the structure. Effects ofnonlinearity on response are dependent on the frequency of excitation with nonlinearity causing anincrease in response at low frequencies of excitation. However its effects are not significant at highfrequencies.