Strength and Axial Behavior of Circular Concrete Columns Reinforced with CFRP Bars and Spirals
Publication: Journal of Composites for Construction
Volume 18, Issue 2
Abstract
The behavior of concrete members reinforced with fiber-reinforced polymer (FRP) bars has been the focus of many studies in recent years. However, limited research work has been conducted to examine the axial behavior of concrete columns reinforced with FRP bars. In this paper, the behavior and compression strength of 11 full-scale circular concrete columns reinforced with carbon fiber–reinforced polymer (CFRP) bars and spirals were investigated. The test variables included reinforcement type (CFRP versus steel); longitudinal CFRP reinforcement ratio; and the volumetric ratio, size, and spacing of CFRP spirals. The test results indicated that the CFRP and steel reinforced concrete (RC) columns behaved in a similar manner up to their peak loads. The CFRP bars were effective in resisting compression until after crushing of concrete, and contributed on average 12% of column capacity. The design equation is modified to accurately predict the ultimate load capacities of CFRP RC columns. A new factor () is introduced in the modified equation to account for the FRP bars’ compressive strength properties as a function in their ultimate tensile strength.
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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) and the Fonds quebecois de la recherche sur la nature et les technologies (FQRNT) for their financial support; Pultrall Inc. (Thetford Mines, Quebec) for their donation of the FRP materials; and the technical staff of the structural lab of the Department of Civil Engineering at the University of Sherbrooke.
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Information & Authors
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Published In
Journal of Composites for Construction
Volume 18 • Issue 2 • April 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: May 9, 2013
Accepted: Aug 1, 2013
Published online: Oct 28, 2013
Discussion open until: Mar 28, 2014
Published in print: Apr 1, 2014
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