Experimental Investigation of Full-Depth Precast Overhang Panels for Concrete Bridge Decks
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Performance of a new full-depth precast overhang panel system for concrete bridge decks is investigated experimentally. In contrast to conventional cast-in-place deck overhangs, the proposed full-depth precast overhang system has the potential to speed up construction, reduce costs, improve construction safety and improve durability of the bridge system. To validate the capacity of the proposed overhang system, quasi-static monotonic tests are conducted on two precast overhang double-panel specimens and a conventional overhang. Factored design load limits are applied to the overhang to investigate the load-deformation capacity. Each overhang is then loaded near its edge to examine the collapse capacity and the associated failure modes-particularly the influence of panel-to-panel connections for the full-depth precast panels. When compared to the conventional cast-in-place overhang behavior, the experimental results show that the precast full-depth overhang introduces different behavior modes, largely due to the influence of the partial depth panel-to-panel connection. This reduces the ultimate carrying capacity by some 13 percent, but in spite of this reduction, behavior is satisfactory with a high margin of safety above the AASHTO LRFD design loads. 2009 ASCE.
