In this study a steel moment resisting frame in a high seismic prone area in Iran has been remodeled based on different versions of Iranian Seismic Code (Standard No. 2800 1988, 1999, 2005) to estimate the seismic fragility and mean annual loss for the modeled buildings. At the first stage a probabilistic seismic hazard analysis (PSHA) has been performed to extract hazard curve in CRISIS platform. (Akkar and Bommer 2007) earthquake prediction model for the Middle East has been used in the hazard analysis. In the next stage, hundreds of nonlinear incremental dynamic analyses by means of lumped-parameter based structural models have been simulated and performed to extract the fragility curves by using OpenSees. Consequently by combining the hazard curves, judgmental event trees and seismic fragility curves for the extensive damage mode (EDM), the required annual loss curves are extracted.
2In this study, structural response of a seismically designed steel moment-resisting frame subjected to travelling fire is investigated. This is to determine the structural strength of a generic frame designed for an extreme load when subjected to fire as another extreme load in addition to quantifying the effect of travelling fire size on its collapse behaviour. In this study, using the concept of travelling fire, and calculating the thermal field applied to structural elements, a generic frame was examined against a family of fires travelling across its first floor. In this regard, the resolved far-field gas temperatures dependent on the distance to the centre of fire were considered in order to calculate the temperature at the unprotected steel members. Analysis results revealed that fire size can deeply affect the total collapse time of a frame so that by reducing the fire size to a half or a quarter, collapse time increases by 19% and 62%, respectively. It was also suggested that columns of such structures should be designed against travelling fire considering the effect of load redistribution by which axial forces of columns might be doubled compared to the nominal loads applied to them prior to fire.
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