Strength and Behavior of Circular FRP-Reinforced Concrete Sections without Web Reinforcement in Shear
Publication: Journal of Structural Engineering
Volume 143, Issue 3
Abstract
Considerable experimental research work has been conducted to quantify the shear strength of rectangular concrete members reinforced with fiber-reinforced polymer (FRP) bars. In contrast, no research seems to have investigated circular concrete members reinforced with FRP bars under shear loads. This paper reports on a study on the behavior and shear strength of full-scale circular concrete beams reinforced with longitudinal FRP bars. The beams, which measured 3,000 mm in length by 500 mm in diameter, were tested under four-point bending. The test parameters included the longitudinal reinforcement ratio and the modulus of elasticity of the reinforcing bars. Steel, glass-FRP, and carbon-FRP bars were used in the experimental program. The experimental results were compared with current codes and design guidelines as well as to recently developed shear design equations appearing in the literature. The comparison indicates that the shear capacity of FRP-reinforced concrete members with circular cross sections may be determined with the approaches developed for rectangular sections provided that certain modifications are made to take into account the effective shear depth and equivalent breadth.
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Acknowledgments
The authors would like to express their special thanks and gratitude to the Natural Science and Engineering Research Council of Canada (NSERC), Canada Research Chair in Advanced Composite Materials for Civil Structures, the Fonds de la recherche du Quebec—Nature et Technologie (FRQ-NT), and the Ministère de l’Économie, de l’Innovation et des Exportations (MEIE) of Quebec for their financial support, and Pultrall Inc. (Thetford Mines, Quebec) for the donation of the GFRP and CFRP reinforcing bars. They are also grateful to the technical staff of the Canadian Foundation for Innovation (FCI) structural lab at the Department of Civil Engineering of the University of Sherbrooke.
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Published In
Journal of Structural Engineering
Volume 143 • Issue 3 • March 2017
Copyright
©2016 American Society of Civil Engineers.
History
Received: Mar 15, 2015
Accepted: Aug 31, 2016
Published online: Oct 18, 2016
Published in print: Mar 1, 2017
Discussion open until: Mar 18, 2017
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