We are evaluating a 5 span concrete box girder bridge with an existing non-composite asphalt topping. After removal of the existing asphalt topping, can the proposed new 5" concrete deck be made composite with the existing concrete box girders. The bridge is 9 girders wide and the thickness of the top slab of the box is 5 inches. The bridge was constructed circa 1958 and each span is a simple span with no continuity between spans. The ideal solution would be to make the bridge continuous for HL-93 live load and place negative steel reinforcing within the new concrete slab at the intermediate piers. Does anyone have experience with this and if so, how to install slab ties connecting the slab to the top of the existing box girders. Can we achieve composite action by scabbling the tops of the existing box girders? Thanks for your consideration.
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