Cracking and Crack Control in Circular Concrete Bridge Members Reinforced with Fiber-Reinforced Polymer Bars
Publication: Journal of Bridge Engineering
Volume 24, Issue 1
Abstract
Serviceability requirements are crucial in the design of fiber-reinforced-polymer (FRP) RC bridge members. Permissible crack width under service loads is one of the requirements that can control design. Crack-control models have been included in the Canadian and American design codes based on experimental work on FRP-RC members with rectangular cross sections. In this study, the applicability of these models to RC bridge members with a circular cross section was assessed experimentally. A total of nine full-scale, circular RC specimens measuring 0.5 m in diameter and 6 m in length were constructed and tested up to failure under a four-point bending load. The test parameters included the longitudinal-reinforcement ratio and the longitudinal-reinforcement type, including glass FRP, carbon FRP, basalt FRP, and steel bars. The experimental results were reported in terms of crack patterns, crack spacing, and crack width versus flexural tension-bar strain and the applied moment. Crack-control models in the current FRP codes and design guidelines were re-examined, extended, and applied to circular FRP-RC members. Design equations for estimating the service stress in the FRP reinforcement and the cracked moment of inertia were theoretically derived and presented for the circular FRP-RC members. Crack-width predictions were compared with the experimental results. The comparison indicated that the crack-control formulae developed for rectangular FRP-RC members can be used for the cracking control of circular FRP-RC members by using the redefined parameters developed and proposed in this study to take into account the geometry, bar spacing and distribution, and effective tension stiffening area.
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Acknowledgments
The authors express their special thanks and gratitude to the Natural Science and Engineering Research Council of Canada (NSERC), the NSERC Research Chair in Innovative FRP Reinforcement for Concrete Structures, the Tier-1 Canada Research Chair in Advanced Composite Materials for Civil Structures, the Ministry of Transportation of Quebec (MTQ), the Ministry of Transportation of Ontario (MTO), the Fonds Québécois de la Recherche sur la Nature et les Technologies (FQRNT), the Canadian Foundation for Innovation (CFI), Pultrall Inc. (NSERC Research Chair industrial partner) for donation of the FRP materials, and the technical staff of the CFI structural laboratory in the Department of Civil Engineering at the University of Sherbrooke.
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Published In
Journal of Bridge Engineering
Volume 24 • Issue 1 • January 2019
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Jan 8, 2018
Accepted: Jul 16, 2018
Published online: Nov 13, 2018
Published in print: Jan 1, 2019
Discussion open until: Apr 13, 2019
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