Effects of torsional irregularity and seismicity level on progressive collapse potential of steel moment frames

Authors

Department of Civil Engineering , Faculty of Engineering and Technology, Imam Khomeini International University

Abstract

Abstract: In this paper, effects of torsional irregularity and seismic resistance level of structures with steel special moment resisting frame system, which were deigned based on valid codes, have been evaluated. Structures were 3, 6 and 9 story buildings and sites had high, average and low seismicity levels. Also, buildings had different levels of torsional irregularity. Buildings were selected in a manner that had equal seismic mass and base shear. Gravity and seismic loading were applied regarding ASCE 7-05 code and structures were designed in accordance with AISC 2010. In order to perform progressive collapse analysis, the nonlinear dynamic analysis procedure regarding GSA 2013 code was selected. Results show that buildings with greater torsional irregularity have higher strength against progressive collapse failure. Moreover, buildings in region with higher seismicity level have higher strength against progressive collapse failure. A damage index was defined that related to building height, seismicity level of site, and level of torsional irregularity.

Keywords

References

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