Abstract
One of the most serious terrorist threats to the strategic structures is vehicle bombs. A blast-resistant design approach is to increase distance between a potential bomb and structure. The best way to do this is to provide the perimeter protection (fence, guards, and barriers) around the building. The aim of this study is to evaluate the effect of stand-off distance on the blast fragility of steel moment-resisting buildings. To this end, the perimeter protections have been considered at distances of 2, 6 and 10 m from building and the fragility curve has been developed for three steel moment-resisting buildings with different heights of 4, 8 and 12 stories. For comparison objectives, the probabilistic-based assessment of buildings without the perimeter protection has been also performed. The results show that providing the perimeter protection can be effective in improving the performance of low-rise buildings whereas for high-rise buildings, the perimeter protection not only cannot be effective, but also may make the high-rise buildings more vulnerable against explosion hazard.
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