Additional Authors: Nan Deng

This paper presents an alternative approach of performing seismic soil structure interaction (SSI) analysis. In this approach, the input earthquake motion is represented by an acceleration response spectrum, instead of an acceleration time history fitted to the input spectra as currently used in most SSI analysis. The input spectrum is converted to a power spectrum density (PSD) function, and the response PSDs of the soil-structure system to the input PSD are computed. All required design parameters are computed from the PSD responses of the system. The solutions obtained as such represent the statistical mean from all possible input time histories fitting the same input spectrum.

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