Probabilistic Seismic Assessment of RC Buildings Considering Soft and Extreme Soft Story irregularities Subjected to Main Shock-Aftershock Sequences

Document Type : Research Article

Authors

1 Faculty of civil engineering, SHahrood university of technology

2 faculty of civil engineering, Shahrood university of technology,

3 Faculty of Civil engineering, Shahrood University of Technology, Shahrood, Semnan, Iran

4 Assistant Professor of Civil Engineering; Shahrood University of Technology

Abstract

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.

Keywords

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References

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Amirkabir Journal of Civil Engineering
Volume 53, Issue 2
May 2021
Pages 457-478

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