Optimum Lateral Load Distribution for Seismic Design of Nonlinear Shear-Buildings Considering Soil-Structure Interaction

摘要

The lateral load distributions specified by seismic design provisions are primarily based on elasticudbehaviour of fixed-base structures without considering the effects of soil-structure-interaction (SSI).udConsequently, such load patterns may not be suitable for seismic design of non-linear flexible-baseudstructures. In this paper, a practical optimization technique is introduced to obtain optimum seismic designudloads for non-linear shear-buildings on soft soils based on the concept of uniform damage distribution. SSIudeffects are taken into account by using the cone model. Over 30,000 optimum load patterns are obtainedudfor 21 earthquake excitations recorded on soft soils to investigate the effects of fundamental period of theudstructure, number of stories, ductility demand, earthquake excitation, damping ratio, damping model,udstructural post yield behaviour, soil flexibility and structural aspect ratio on the optimum load patterns.udThe results indicate that the proposed optimum load patterns can significantly improve the seismicudperformance of flexible-base buildings on soft soils.