Blast-Resistant Highway Bridges: Design and Detailing Guidelines (2010) / Chapter Skim
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1The possibility of terrorism against our nation's bridges is an ever-increasing threat in today's society. Data collected by the Mineta Transportation Institute indicate that at least 53 terrorist attacks worldwide specifically targeted bridges between 1980 and 2006, and 60% of those attacks were bombings.
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Each of the columns tested during the Phase II experimental program contained six strain gauges, and the strain data gathered during the tests were used to verify boundary conditions and blast-load distribution for each small standoff test. Three of the ten columns tested during the small standoff tests experienced significant shear deformation at the base, and the other seven columns displayed a combination of shear and flexural cracking.
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increasing cross-section size will generally improve column resistance to blast loads, and a minimum column diameter of 30 in. is recommended for columns subjected to close-in blasts.
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