Abstract
One of the prefabricated bridge system used to accelerate bridge construction is the precast full- depth deck panel (FDDP) with transverse joint placed over steel or concrete girders. In this system, grouted pockets are provided to accommodate clusters of shear connectors connected to steel or concrete girders. In this research, ultra-high performance fibre-reinforced concrete (UHPFRC) and high-modulus glass fibre reinforced polymer (GFRP) bars are utilized in the closure strip between the adjacent precast FDDPs for enhanced strength and durability. Two actual-size, GFRP-reinforced, precast FDDPs were erected to perform fatigue tests using the foot print of the truck wheel loading specified in the Canadian Highway Bridge Design Code (CHBDC). Each FDDP had 200-mm thickness, 2500-mm width and 3700-mm length in the direction of traffic and rest over braced twin-steel girder system. The transverse closure strip between connected precast FDDPs has a width of 100-mm with zigzag-shape from each side of the joint to increase moment capacity along the interface between the UHPFRC and the precast FDDP along the joint. GFRP bars in the precast FDDPs project into the closure strip with a development length of 175-mm. Two types of fatigue tests were performed, namely: (i) high-cyclic constant amplitude fatigue loading followed by monotonically loading to-collapse; and (ii) low-cyclic accelerated variable amplitude fatigue loading. Overall, the test results demonstrated the excellent fatigue performance of the developed closure strip details. In addition, the ultimate load carrying capacity of the FDDP was far greater than the factored design wheel load specified in CHBDC.
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