Blast-Induced Damage Mapping Framework for Use in Threat-Dependent Progressive Collapse Assessment of Building Frames

摘要

This paper proposes a methodology for mapping structural damage onto building frames due to exterior blast threats for use in a threat-dependent progressive collapse assessment. The proposed approach contrasts with current practice, which typically relies on a threat-independent approach for progressive collapse analysis. Damage is mapped to the structure based on the calculated response of the discrete structural components (particularly the columns) to a blast-induced pressure time history. Contours of structural damage can then be mapped over the building face for discrete combinations of charges and standoffs. For a prototype reinforced concrete building frame, calculated distributions of damage for conventional explosive threats suggest that the current state-of-practice approach (in which damage is represented with a single column removal) may not constitute a generally conservative strategy for progress collapse-resistant design. The proposed framework can be used to determine standoff distances needed to reduce progressive multicolumn failure scenarios in building frames for high-risk facilities and can be used as input for a progressive collapse assessment of these frames. (C) 2016 American Society of Civil Engineers.