الفهرس 
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Abstract
The investigation on the energy transfer mechanism from soils to buildings
during earthquakes is critical for the design of earthquake resistant structures and
for upgrading existing structures. Thus, the need for research into Soil-Structure
Interaction (SSI) problems is greater than ever. Moreover, recent studies show that
the effects of SSI may be detrimental to the seismic response of structure and
neglecting SSI in analysis may lead to un-conservative design. Despite this, the
conventional design procedure usually involves assumption of fixity at the base of
foundation neglecting the flexibility of the foundation, the compressibility of soil
mass and consequently the effect of foundation settlement on further redistribution
of bending moment and shear force demands.
Hence the soil-structure interaction analysis of multi-story buildings is the
main focus of this study; the effects of SSI are analyzed for typical multi-story
building resting on raft foundation. Time History method of analysis are used for
seismic demands evaluation of the target moment resistant frame buildings: with
suit of three time history records. Three-dimensional FEM model is constructed to
analyze the effects of different soil conditions and number of stories on the
vibration characteristics and seismic response demands of building structures.
Numerical results obtained using soil structure interaction model conditions are
compared to each other. The peak responses of story shear, story moment, story
displacement and Top Acceleration are analyzed. The analysis results of different
approaches are used to evaluate the advantages, limitations, and ease of application
of each approach for seismic analysis.