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This paper presents a method to evaluate the blast pressures due to conventional blast loads on a two span continuous composite steel girder bridge system. The bridge design is based on AASHTO LRFD method. Resistance capacities of bridge deck and composite steel girder are calculated according to AASHTO specifications. Five different blast load cases are considered that affects i) the deck slab and girders, ii) deck slab, girders and substructure pier cap, and iii) substructure pier, deck slab, and girders. The blast loads on a composite steel bridge system are estimated based on the principles of blast wave propagation. Peak blast pressures on the bridge deck resulting from the blast at any given location vary with different arrival times. The peak pressures decay with increases in time duration (td), as the blast wave traverses along the bridge deck. |
