effects of height of adjacent structures on the seismic behavior of moment resisting structure

As in cities and urban areas, the building structures are built closely to each other, the dynamic interaction anddynamic coupling of adjacent buildings via the underlying soil should not be ignored. available evidences show that interaction of adjacent structures has not been paid comprehensive attention. in addition, major researches in this field aresubjected to simulate superstructures as lumped mass with a single degree of freedom or two-dimensional models with plain strain behavior, and soil is simulated by spring, mass, and damper, an equivalent impedance function or assumption as a homogeneous, isotropic and linear elastic half-space. because of this excessive simplification, the complex geometry of the cross-section as well as the wrapping and secondary torsion specially in complicated and massive structures, are ignored, that would be lead to obtain not so accurate and reliable seismic results rather than 3d models, so 2d simplification is potentially risky in the seismic analysis of soil structure interaction (ssi). the result of researches have shown that the structure soil structure interaction (sssi) effects are very dependent on adjacent structures height in twostructures, three structures and a group structures on shallow foundations or deep foundations.