The parametric and numeric investigations on the sensitivity of Soil-Structure-Interaction analysis in middle story concrete frames constructed on the firm soils

The effect of soil structure interaction to calculate the dynamic forces and displacements of concrete frame structures have been studied. The formulation of nonlinear deformations of the substructures and super-structures in the frequency domain have been accomplished. In order to full order modeling of sample middle story frames , the intensive finite element modules to treating the mass, damping and stiffness matrices of beam , shells and stick model columns have been written and assembled. In the procedure of analysis in SASSI program, the effect of variation of the modal periods of sample structures on the earthquake spectrum demands have been considered and implied to the residual dynamic stresses force vectors on the global degrees of freedom of the super-structures. In this paper, the validation of desired calculated response of MRF models have been done with the analytical Vinkler-Trifonac vibrating models. The sensitivity analysis on the types of earthquake wave models such as P-wave, SV, SH-wave, Rayleigh and Love-waves on the dynamic amplification ratios of response spectrums have been performed. Some tremendous Earthquake records have been chosen as the base motion of sample frame models. The achievements of this research shown that the implying the soil-structure-interaction analysis is very important and produce the dynamic responses of middle-Story-Stiff-Massive Structures have going to more magnified. The parametric non-dimensional graphs which shown in this paper are very useful to brief hand rule design of absorbed base shear and dynamic magnifications of sample structure model based on the slenderness ratios and wave length of Earthquake loadings

Keywords:

Soil-Structure-interaction , Dynamic Response , Flexibility volume method , Sub-structuring , concrete MRF frames