Effects of Uncertain Soil Properties on the Inelastic Seismic Response of Building-foundation Systems

Abstract eng:
This paper quantifies the effects of the variability of soil-structure interaction parameters on the statistical parameters of inelastic structural systems to seismic input. We study a model consisting of a single-degree-of freedom structure with elastic-plastic hysteretic behavior resting on deformable soil. The foundation flexibility is modeled via linear equivalent lumped stiffness and damping coefficients. As seismic input we use a set of 66 actual earthquake records from the soft lakebed of Mexico City and a set of 87 accelerograms recorded at stiffer sites in California. To assess the impact of random normalized parameters of the SSI system on the statistical properties of ductility demands we use statistical theory and Monte-Carlo simulation to calculate mean values and coefficients of variation of the system dynamic parameters and of the seismic ductility demand in the nonlinear structure. Explicit formulas are derived to calculate response coefficients of variation in terms of those of the SSI system.

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