Ground motion prediction equation for inelastic spectral displacement in Iran

This paper is devoted to investigating the inelastic displacement spectra compatible with iran. owing to inadequacy of code-compliant elastic design spectra to predict structural damage during sever earthquakes, different approaches are proposed to overcome this problem. inelastic design spectrum is one of the most well-known methods introduced by researchers. in practice, attenuation relationships can be used in probabilistic seismic hazard analysis to obtain the inelastic design spectrum. in this paper, a new ground motion prediction equation (gmpe) has been proposed for inelastic spectral displacement. in this regard, 806 horizontal ground motions are utilized with magnitudes ranging from 4 to 7 and epicentral distances less than 200 km, which are obtained from 330 earthquakes in iran. according to the tectonic condition, iran zone can be divided into two parts: zagros and alborz-central iran. however, three equations have been presented for the whole country zone, zagros and alborz-central iran zones, separately. the main parameters such as earthquake magnitude, site-source distance, and site conditions have been related to the inelastic spectral displacement. based on average shear wave velocity to a depth of 30 m, sites have been categorized into three classes. for the purpose of practicality, simplified equations have been proposed to predict inelastic spectral displacements in iran.