Blast-induced Progressive Collapse: Threatindependent or Threat-dependent Approach

In this study, blast-induced progressive collapse potential is assessed in a 5-story steelmoment-resisting frame. Both threat-independent and threat-dependent approaches areconsidered in this paper. For this purpose, first the frame was analyzed in different threatindependentcolumn removal scenarios using alternate load path method. Then, the modelstructure is analyzed under different simultaneous blast and column removal scenarios.Affecting parameters such as location of explosive charge, location of initial failure andnumber of spans are included in numerical modeling. According to results, progressivecollapse potential depends meaningfully to column removal approach; threat-dependentapproach provides larger structural response. The obtained results provide better insightinto the dynamic column removal in blast-loaded framed structures.

Keywords:

Progressive collapse , Dynamic Analysis , Blast , Alternate load path , Steel momentresistingframe