Confinement Model for Concrete Columns Reinforced with GFRP Spirals
Publication: Journal of Composites for Construction
Volume 22, Issue 3
Abstract
Confinement of concrete using glass fiber–reinforced polymer (GFRP) spirals was evaluated using small-scale concrete cylindrical specimens with a 254-mm diameter and 762-mm height under concentric axial compression. The contribution of longitudinal GFRP bars to confinement was excluded by using wood dowels as longitudinal reinforcement to maintain a constant spiral pitch. Thus, concrete confinement was provided exclusively by the GFRP spiral. An ultimate hoop strain of 1.0 to 1.5% was achieved for the GFRP spirals of well-confined small-scale concrete specimens. Expressions were developed for the confined compressive strength and ultimate axial compressive strain of concrete confined with GFRP spirals. The resulting confinement model is compared with axial column tests of reinforced concrete columns with GFRP spirals and GFRP longitudinal bars from the present study and the literature. An expression is proposed for the ultimate axial compression capacity of concrete columns reinforced with GFRP spirals and GFRP longitudinal bars.
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Acknowledgments
The authors acknowledge the support of the Department of Civil and Environmental Engineering at the University of Utah. The authors also acknowledge Owens Corning (Hughes Bros Inc.) and Geneva Rock for their contribution of materials. The authors acknowledge the assistance of Mark Bryant, Ruoyang Wu, Trevor Nye, Duc Tran, Joel Parks, and M. J. Ameli for their help with the experiments. Finally, the authors acknowledge the comments made by the reviewers, which improved the quality of the paper.
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Information
Published In
Journal of Composites for Construction
Volume 22 • Issue 3 • June 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Nov 6, 2016
Accepted: Dec 29, 2017
Published online: Mar 28, 2018
Published in print: Jun 1, 2018
Discussion open until: Aug 28, 2018
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