http://www.iiees.ac.ir/fa/wp-content/uploads/2015/07/top.jpg00adminhttp://www.iiees.ac.ir/fa/wp-content/uploads/2015/07/top.jpgadmin1970-01-01 00:00:001970-01-01 00:00:00THE EFFECTS OF STIFFNESS IRREGULARITY IN HEIGHT ON SEISMIC RESPONSE OF TRUCTURES BY CONSIDERING SOIL-STRUCTURE INTERACTION