investigation in performance level of asymmetric structures

according to development of displacement–performance based design, there are some studies on different structures which most of them are about regular plan structures. in this research has been tried to review the frame steel structures designed based on 2800 standard of iran to achieve the designed structures performance level to find how much function levels it covers in earth quake. to show this matter, we used the members receipt and replace basis in push over dynamic analysis. also, in order to show eccentricity in function level, the location of the center of mass transferred in amount of 10&15 percents of structure dimension toward the center of mass and the influence of gravity and lateral load is reviewed regarding the selected styles. the achieved conclusions appear that replace of mass center will increase by raising the eccentricity and change the style of existing plastic hinges and the numbers.