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Influence of Reinforcement on the Behavior of Concrete Bridge Deck Slabs Reinforced with FRP Bars
Authors:Sherif El-Gamal  Ehab El-Salakawy  Brahim Benmokrane
Affiliation:1Postdoctoral Fellow, Dept. of Civil Engineering, Faculty of Engineering, Univ. of Sherbrooke, Sherbrooke, Quebec, Canada, J1K 2R1. E-mail: Sherif.El-Gamal@USherbrooke.ca
2Canada Research Chair Professor, Dept. of Civil Engineering, Faculty of Engineering, Univ. of Manitoba, Winnipeg, Manitoba, Canada, R3T 5V6. E-mail: Ehab_Elsalakawy@UManitoba.ca
3NSERC Research Chair Professor in FRP Reinforcement for Concrete Structures, Dept. of Civil Engineering, Faculty of Engineering, Univ. of Sherbrooke, Sherbrooke, Quebec, Canada, J1K 2Rl (corresponding author). E-mail: Brahim.Benmokrane@USherbrooke.ca
Abstract:This paper presents the results of an experimental study to investigate the role of each layer of reinforcement on the behavior of concrete bridge deck slabs reinforced with fiber-reinforced polymer (FRP) bars. Four full-scale concrete deck slabs of 3,000?mm length by 2,500?mm width and 200?mm depth were constructed and tested in the laboratory. One deck slab was reinforced with top and bottom mats of glass FRP bars. Two deck slabs had only a bottom reinforcement mat with different reinforcement ratios in the longitudinal direction, while the remaining deck slab was constructed with plain concrete without any reinforcement. The deck slabs were supported on two steel girders spaced at 2,000?mm center to center and were tested to failure under a central concentrated load. The three reinforced concrete slabs had very similar behavior and failed in punching shear mode at relatively high load levels, whereas the unreinforced slab behaved differently and failed at a very low load level. The experimental punching capacities of the reinforced slabs were compared to the theoretical predictions provided by ACI 318-05, ACI 440.1R-06, and a model proposed by the writers. The tests on the four deck slabs showed that the bottom transverse reinforcement layer has the major influence on the behavior and capacity of the tested slabs. In addition, the ACI 318-05 design method slightly overestimated the punching shear strength of the tested slabs. The ACI 440.1R-06 design method yielded very conservative predictions whereas the proposed method provided reasonable yet conservative predictions.
Keywords:Bridges  concrete  Bridge decks  Concrete slabs  Concrete  reinforced  Fiber reinforced polymers  Reinforcement  
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