In this work, a numerical model based on the Beam-on- Nonlinear-Winkler-Foundation (BNWF) concept is developed to capture complex foundation behavior. Evaluation of the model and associated parameter selection protocol is conducted using a suite of centrifuge experiments. Following the model validation, input parameter sensitivity is investigated using tornado diagram analysis and the First-Order-Second-Moment method. Among the parameters required for the BNWF modeling, the vertical tension capacity and friction angle have the most significant effect on the capability of the model to capture force and displacement demands. The model is then exercised by studying the response of shearwall-foundation and shearwall-frame-foundation systems. These analyses indicate that if reliably quantified and designed, SFSI has great potential for reducing system level seismic forces and inter- story drift demands. Finally, the proposed model is implemented within the framework of OpenSees (an open source finite element software package developed by the Pacific Earthquake Engineering Research center) to encourage its use within engineering community.

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