Abstract
Post-tensioned bulb-tee girders provide an extremely cost-effective structural system for bridge construction. Use of high strength concrete and further refinement of the structural system promises to yield longer spans, while providing even greater economy and durability. The analysis, design and construction of a prestressed, post-tensioned bulb-tee girder bridge requires careful consideration of a multitude of factors. This article attempts to outline the essential design and construction considerations for a composite prestressed and post-tensioned system in accordance with the AASHTO LRFD Bridge Design Specifications. The structural system reviewed consists of precast, pretensioned bulb-tee girders, field spliced and post-tensioned in two stages for a continuous composite structural system spanning 3 to 5 spans. This type of structural system has been used extensively and economically for bridges requiring moderately long spans ranging up to 320 ft (97.5 m).
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