Influence of Reinforcement on the Behavior of Concrete Bridge Deck Slabs Reinforced with FRP Bars
Publication: Journal of Composites for Construction
Volume 11, Issue 5
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 length by width and 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 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.
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Acknowledgments
The writers acknowledge the financial support received from the Natural Science and Engineering Research Council of Canada (NSERC), the Fond Quebecois pour la Recherche en Nature et Technologie (FQRNT), and the Network of Centres of Excellence on Intelligent Sensing for Innovative Structures ISIS-Canada. The writers wish to thank the Ministry of Transportation of Quebec (Department of Structures). Also, many thanks to Pultrall Inc. (Thetford Mines, Quebec) for generously providing the FRP materials. Special thanks to François Ntacorigira, technician at the Department of Civil Engineering, University of Sherbrooke, for his help in the fabrication and testing of the slabs.
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© 2007 ASCE.
History
Received: Jan 9, 2006
Accepted: Aug 9, 2006
Published online: Oct 1, 2007
Published in print: Oct 2007
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