Evaluation Method of Story Stiffness and Damping Coefficients Through Structural Response Influenced by SSI Effects

Abstract

We propose a method to identify story stiffness and damping coefficients through responses of shear type multistory building influenced by SSI effects. It is assumed that sway and rocking motion of the base and the horizontal motions of all the floors are observed. This method utilizes the base-fixed modal responses of substructure models extracted from the whole SSI model with using quasi-complex modal parameters. Having applied this method to the numerical model of a 6-story RC structure, the evaluated story stiffnesses and damping coefficients coincide well with the target values.