University of Qom Civil Infrastructure Researches 2783-140X 6 2 2021 02 19 An Investigation on Irregular Steel Moment-Frame Structure Under Different Column Removal Scenarios An Investigation on Irregular Steel Moment-Frame Structure Under Different Column Removal Scenarios 133 147 1859 10.22091/cer.2021.6905.1244 FA Masoud Ahmadi Department of Civil Engineering, Ayatollah Boroujerdi University, Boroujerd, Iran 0000-0002-3694-0518 Mehdi Ebadi-Jamkhaneh Department of Civil Engineering, School of Engineering, Damghan University. 0000-0001-9914-8280 Journal Article 2021 05 03 This research examines the effect of plan irregularities on the progressive collapse of steel structures. Firstly, the three structures, regular and irregular are designed. Secondly, the effect of the two plan irregularities on the progressive collapse of moment resisting frame assessed. The collapse patterns of the buildings are analyzed and compared under seven loading scenarios using non-linear dynamic and pushdown analyses. In the non-linear dynamic analyses, node displacements above the removed columns and the additional force on the columns adjacent to them are discussed. Furthermore, the strength and capacity of the columns are compared to determine their susceptibility to collapse. In the non-linear static analyses, the pushdown curve and yield load factor of the structures are obtained after column removal. The results indicate that an irregular structure collapses in most of the column removal scenarios. Moreover, when comparing regular and irregular structures, the demand force to capacity ratio (D/C) of the columns in the irregular structures is on average between 1.5 and 2 times that of the regular ones. This research examines the effect of plan irregularities on the progressive collapse of steel structures. Firstly, the three structures, regular and irregular are designed. Secondly, the effect of the two plan irregularities on the progressive collapse of moment resisting frame assessed. The collapse patterns of the buildings are analyzed and compared under seven loading scenarios using non-linear dynamic and pushdown analyses. In the non-linear dynamic analyses, node displacements above the removed columns and the additional force on the columns adjacent to them are discussed. Furthermore, the strength and capacity of the columns are compared to determine their susceptibility to collapse. In the non-linear static analyses, the pushdown curve and yield load factor of the structures are obtained after column removal. The results indicate that an irregular structure collapses in most of the column removal scenarios. Moreover, when comparing regular and irregular structures, the demand force to capacity ratio (D/C) of the columns in the irregular structures is on average between 1.5 and 2 times that of the regular ones. https://cer.qom.ac.ir/article_1859_2e13f1a7167019bdfb13e171d40b4b6c.pdf