Farhad Behnamfar - Department of Civil Engineering, Isfahan University of Technology, Esfahan 8415683111, Iran Meisam Banizadeh - M.Sc. Student, Department of Civil Engineering, Isfahan University of Technology,Esfahan 8415683111, Iran چکیده مقاله: A complete nonlinear SSI model of a structural system on soft soil including an inelastic moment frame resting on a foundation on nonlinear Winkler springs is developed in this study. Various RC frames differing in height from 3 to 9 stories ...