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Delayed development of composite action in steel girder bridges

Development of a bridge system where composite action is developed after the concrete has hardened would reduce the extent of cracking observed in bridge decks while elimination of shear studs would reduce the potential tripping hazard to workers. The objective of this research was to recommend a system which met one or both of these goals. To this end, a number of component level tests along with two prototype beam tests were performed. Details of the testing are described in the paper. Of the alternatives considered, two systems appear to offer the most promise for eventual implementation. The first system utilizes a plastic boot placed over the stud prior to casting of the concrete creating a void around the stud. After the concrete has cured the boot can be punctured or removed and the void filled with an epoxy grout. Upon curing the system will perform as though the studs had been directly cast into the concrete. The second recommended alternative utilizes a single plate welded along the length of the girder protruding vertically in the middle of the flange. This allows workers to place a foot on either side while walking. Rebar is then passed through the plate to be embedded in the concrete deck. A prototype beam utilizing this alternative was tested and performed as though there were complete interaction between the steel and concrete. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bridge Structures IOS Press

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