%0 Journal Article %T Probabilistic Seismic Assessment of RC Buildings Considering Soft and Extreme Soft Story irregularities Subjected to Main Shock-Aftershock Sequences %J Amirkabir Journal of Civil Engineering %I Amirkabir University of Technology %Z 2588-297X %A Kouhestanian, Hamed %A pahlavan, hossein %A Shafaei, Jalil %A Shamekhi amiri, mohammad %D 2021 %\ 04/21/2021 %V 53 %N 2 %P 457-478 %! Probabilistic Seismic Assessment of RC Buildings Considering Soft and Extreme Soft Story irregularities Subjected to Main Shock-Aftershock Sequences %K Probabilistic Assessment %K Reinforced Concrete Moment-Resisting Frame %K Soft Story %K Fragility Curves %K incremental dynamic analysis (IDA) %R 10.22060/ceej.2019.15385.5906 %X Recent Iranian earthquake damages like the damages caused by the Kermanshah earthquake revealed that RC buildings having soft-story irregularities experienced more seismic vulnerability. Moreover, earthquake aftershocks increased the seismic failures in past earthquake events. But they are not included in recent seismic design codes. In this article, for assessing the effects of soft-story irregularities and also the earthquake aftershocks, 3,5 and 8 story RC models having intermediate sway frames are designed and then modeled in OPENSEES and then IDA analysis is performed in order to produce the seismic fragility curves consistent with HAZUS definitions. The resulting seismic fragility curves revealed the influence of soft-story irregularities and also main shock-aftershock sequences on the vulnerability of considered RC models. By increasing the height of the RC structures, the effects of soft-story irregularities and the aftershocks decreased in the seismic vulnerability of the considered buildings. %U https://ceej.aut.ac.ir/article_3305_4487597c9f53deade084dcd754eba19f.pdf