Blast Analysis of a Bridge with AASHTO Type VI Girders Using CSI Bridge
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Abstract
Protection of bridges from blast load due to terrorist attacks or accidental explosions is necessary. For this we require to study the performance of a bridge when blast loads are applied above the deck slab. The research presented in this thesis represents the response of AASHTO type VI girders of a bridge subjected to blast loading. This research focusses on the material properties by varying the strength concrete i.e. 6 ksi (41.4 MPa) and 15 ksi (103.42 MPa) and structural point of view by varying the point of application of blast load i.e. above the pier and at mid-span. For this work CSI Bridge software has been used for developing the model, applying blast load and analyzing results. The bridge model used for this experiment has been designed in accordance with “AASHTO LRFD Bridge Design Specifications (Second Edition, 1998, including interims for 1999 through 2002)”. The blast load has been applied in three different levels i.e. high level, medium level and low level. The blast pressure on each element due to different levels of blast load is calculated in accordance with “Unified Facilities Criteria - Structures to Resist the Effects of Accidental Explosions” (UFC 3-340-02). The blast pressure has been applied on each element with the help of a time history function. The experimental results studied were end moments of each girder, a maximum moment in each girder and maximum deflection in each case. Some conclusions were drawn out after comparing the obtained results with allowable limits of moment and deflection.
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Introduction -- Literature survey -- Research significance -- Bridge modeling -- Load calculation -- Study of moments and deflections -- Conclusions
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M.S.