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SIMPLIFIED SEISMIC ANALYSIS OF SOIL-FOUNDATION-STRUCTURE SYSTEMS INCLUDING SOIL-STRUCTURE INTERACTION EFFECTS

This work presents simplified, yet accurate, soil foundation models suitable for dynamic and seismic analysis of structures accounting for Soil Structure interaction effects. The model parameters are extracted from impulse response functions (B-IRF) of the soil foundation system to B-Spline impulse excitations. The B-IRF are obtained using a direct time domain 3-D B Spline BEM methodology for elastodynamics. These models are suitable for direct time domain analysis and they accommodate nonlinear structural behavior. The ease of use, accuracy and versatility of the proposed models is demonstrated. A series of studies address the effectiveness of seismic isolation devices when SSI effects are accounted for.