Earthquakes pose serious problems for structures, equipment and systems all over theworld. It is therefore necessary to precisely understand the dynamic behavior of structures. The dynamicbehavior of a structure is greatly influenced by the dynamic behavior of supporting soil and siteconditions. This paper is aimed at Soil-Structure Interaction (SSI) based analysis of a nuclear reactorbuilding by varying the embedded depth of the structure, while keeping constant the other parameters ofseismic environment. The SSI analysis of a structure provides design input motion for equipment, piping,instrumentation, etc. Therefore SSI analysis must be employed for structures containing sensitiveequipment. The SSI analyses are performed using state of the art software SASSI. The details of SSImodel, with varying depths of embedment, and the results of analysis have been discussed. The studyshows the effect of embedment depth of structure on the dynamic behavior of structures. The studyproves the importance of SSI analysis and inadequacy of conventional fixed base approach of structuralanalysis in determining the dynamic behavior of structures. Correlation between the zero periodacceleration at different levels of the structure and the embedment depth of structure has been developedand presented in this paper. Finally, the conclusions drawn from this study are summarized.
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