Abstract
Structural collapse caused by explosion and terrorist attacks often occurs. Steel columns, as the main load-bearing members of steel structures, often cause continuous structural collapse due to their damage. In order to study the reliability of steel column subjected to blast loading, box-shaped steel columns are taken as the research object, with considering the uncertainties associated with blast loading and material properties. Damage is determined according to damage index based on the ratio of the overall displacement and the local displacement to the maximum displacement. In this paper, P-I curves evaluation method and Monte-Calro simulation method are utilized to obtain the failure probability and cumulative distribution functions of the damage index. The results show the importance of considering the uncertainties in assessing the damage index of the columns against explosion. Also, sensitivity analyses show that damage index has the highest sensitivity to peak reflected pressure.
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