m Mahdavi Adeli - lecture islamic azad university shoushtar branch
m Banazadeh - assistant professor

The selected intensity measure IM parameter plays the most significant role in different parts of the problem of probabilistic seismic demand analysis consequently selecting IM parameter is a matter of concern and must be based on several studied. considering the results of recent studies which show that the current IM parameter i.e the spectral acceleration at the first mode of vibration is not an appropriate seismic demand estimator for all types of sturctures with different heights introducing a new IM to estimated the seismic demand of steel moment resisting frames is the main objective of this article.

probabilistic seismic demand analysis , intensity measure , spectral acceleration area , incremental dynamic analysis , steel moment resisting frames