ABSTRACT
An analytical investigation of the effects of soil-pile foundation interaction on the inelastic seismic response of building structures has been conducted and the result is written in this paper. The building model is 12-stories RC frame-wall structure designed according to the fully ductility principle and located in the Indonesian Seismic Region 4. The explicit stiffness and damping interactions in Lumped Parameter Model according to Novack’s formulation are utilized. The fixed base and flexible foundations (incorporating soil footing and soil-pile foundation interaction) are considered in this study. The building models are then excited by approximately free field earthquake ground-motions. Incorporating soil-foundation interaction in the structural analysis increases significantly the inelastic structural response of stiff structures such as wall-frame building. This is because of the significant rotation of the wall’s bases. The beams in the wall-frame plane are very sensitive to the deformation of wall, which is caused by the foundation rotation.
