Seismic Soil-Structure Interaction Analysis Including Ground Motion Incoherency Effects

Abstract eng:
During the past few years, significant progress has been made in developing ground motion incoherency models using the most recent data from dense arrays and in implementing these models into soil-structure interaction (SSI) analysis and its verification. In particular, the new incoherency models have been implemented in the well known SSI program SASSI2000. Both the incoherency models and its implementation have been reviewed by the US Nuclear Regulatory Commission (USNRC) and approved for design application. In this paper a brief description of these recent developments and the regulatory perspective on the model and its implementation for soil-structure interaction methodology are presented. Sample results for two recent studies for nuclear facilities in Western and Eastern US, with their respective design motions are presented. Beneficial effects of SSI, particularly with modeling of ground motion incoherency, are illustrated and discussed.

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