Precast Concrete Deck-to-Girder Connection Using UHPC
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Precast Concrete Deck-to-Girder Connection Using UHPC

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      Final Report July 2018-December 2019
    • Abstract:
      Recently, the implementation of ultra-high performance concrete (UHPC) in bridge connections is growing rapidly as an innovative method of accelerated bridge construction. This report presents a new precast concrete deck-to-concrete girder connection that eliminates any changes to girder design/production and any possible conflict between deck and girder reinforcement by utilizing UHPC and its exceptional mechanical properties, flowability, and workability. Typical girder shear reinforcement is used and positioned below the soffit of precast deck panels which eliminates the necessity of special shear connectors. The composite action between deck panels and supporting girders is achieved throw filling round shear pockets (4 - 8 in. in diameter) every 2 - 4 ft. along each girder line and haunch areas with UHPC. Loop bars are then embedded in the shear pockets while resting on the top flange of the girder to enhance the composite action with adequate development length. The experimental investigation focused on the main two interface shear planes that control the structural performance of the new connection. The first interface plane is located at the soffit of deck panel at the shear pockets in monolithic UHPC and the second is at the top of concrete girder between the fresh UHPC and hardened conventional concrete (CC-UHPC). Direct shear, L-shape push-off, double shear push-off tests were conducted to evaluate the interface shear resistance of monolithic UHPC. The interface shear resistance of CC-UHPC was evaluated through two different testing methods; slant shear and L-shape push-off tests. Then, full-scale push-off specimens were fabricated and tested to simulate the new connection and evaluate its structural performance and constructability. Based on the experimental investigation results, empirical equations are presented to predict the interface shear resistance of the two studied planes that are used to provide a design procedure for the new connection. Design and construction recommendations are concluded from the outcomes of experimental testing program.
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