Threat-Independent Column Removal and Fire-Induced Progressive Collapse: Numerical Study and Comparison

Document Type : Research Papers


1 Assistant Professor, Department of Earthquake Engineering, Babol University of Technology, Babol, Iran

2 M.Sc. of Structural Engineering, Department of Structural Engineering, Islamic Azad University, Takestan Branch, Iran


Progressive collapse is defined as the spread of an initial failure from element to element, eventually resulting in the collapse of an entire structure or a disproportionately large part of it. The current progressive collapse analyses and design methods in guidelines and codes focus on the alternate load path method. This method is suitable especially in the case of blast-induced progressive collapse. In this paper, fire-induced and threat-independent progressive collapse potential is numerically investigated in steel moment resisting frames. Affecting parameters such as location of initial failure and number of floors are considered in this study. Two different mechanisms were observed in threat-independent and fire-induced progressive collapse: while in threat-independent column removal alternative load paths play major role, in fire-induced progressive collapse the weight of the structure above the failure region is the most important parameter.


Main Subjects

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