Moghadam - Assistant Professor, International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran
Moslemi - M.S. Graduate in Earthquake Engineering, Islamic Azad University, Science and Research Branch, Tehran, Iran
Chizari

The yield point spectra and modal pushover procedures have already been used in seismic design of new buildings and vulnerability evaluation of existing structures. This paper initially identifies the similarities and differences of the two procedures. Then, the modal characteristics of damaged structure are used to modify their methodologies. The applications of the procedures in estimating interstory drift index of asymmetric buildings are investigated for three 5-story reinforced concrete moment resisting frame building models. The results show considerable improvement in estimating the responses of those asymmetric buildings