Interaction between structures under seismic excitation are important to analyse especially for sensible construction. The influence of an adjacent structure may increase or decrease the response for the dynamic structural behavior depending on the frequency content of the seismic-input-motion and soil properties.

In this research, parametric investigation of 50 different cases was carried out by using finite element method for dynamic analysis. This investigation indicated that the rigidity of the adjacent soil is the predominant factor in soil-structure interaction and its increases would definitely reduce the deformation of the structure in the basement levels as well as in the superstructure.

On the other hand, increasing the period of the underlying soil would causes an increase in the story shears and create irregularity in their distributions over the height of the structures. Possible resonance between the frequency content of motion and soil could also play an important role in increasing the structural response.

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