h.r Tavakoli - Department of Earthquake Engineering, Babol University of Technology, Babol, Iran
f Kiakojouri - Department of Structural Engineering, Islamic Azad University, Takestan Branch, Iran

Modeling buildings response to blast and subsequent progressive collapse interested more and more researchers during the past two decades. Due to the threat from extreme loading, efforts have beenmade to develop methods of structural analysis and design. In this paper, progressive collapse capacityof steel moment frames was first investigated using alternate load path method, then a nonlinear dynamic analysis was carried out to examine the response of the steel moment frames in blast and sudden column loss scenario. The structural response of the building under sudden loss of column fordifferent scenarios of column removal, with or without external blast loading was assessed in detail. According to the results, progressive collapse potential are strongly dependent on location of column loss. Loss of column can affect overall response of structure under external blast loads. The obtainedresults provide better insight into the influence of sudden column loss on dynamic response of steel moment frames under blast loading.

Blast,Progressive Collapse,Steel Moment Frame,Column Loss,Dynamic Nonlinear Analysis