Optimal Performance-Based Configurations of Stiffness and Strength Centers in Multi-Story Wall-Frame Asymmetric Buildings Including Soil-Structure Interaction Effects

In this paper, the probabilistic performance-based approach is adopted to evaluate the seismic performance of multi-story reinforced concrete wall-frame asymmetric buildings considering soil-structure interaction (SSI) and identify appropriate stiffness and strength centers configurations. A group of fixed- and flexible-base models with different stiffness and strength eccentricities were considered for parametric studies, and their seismic performance was compared in three different limit states. The optimum configuration of centers was found to be a function of base condition and performance objective. The proposed configurations can be adopted in the performance-based design of asymmetric buildings. Furthermore, the results indicate a detrimental effect of SSI in the Life Safety and Collapse Prevention limit states.