Axial Capacity of Circular Concrete Columns Reinforced with GFRP Bars and Spirals
Publication: Journal of Composites for Construction
Volume 18, Issue 1
Abstract
Several codes and design guidelines are now available for the design of concrete structures reinforced with fiber-reinforced polymer (FRP) bars under flexural and shear loads. Yet, because of a lack of research, North American codes and design guidelines do not recommend using FRP bars as longitudinal reinforcement in columns to resist compressive stresses. This paper reports on 12 full-scale circular reinforced concrete (RC) columns that were tested under concentric axial loads. The columns were reinforced with longitudinal glass FRP (GFRP) bars and newly developed GFRP spirals. The 300-mm diameter columns were designed according to code requirements. The test parameters included reinforcement type (GFRP versus steel); longitudinal FRP reinforcement ratio; and the volumetric ratios, diameters, and spacing of spiral reinforcement. The test results indicated that the GFRP and steel RC columns behaved in a similar manner. The average load carried by the longitudinal GFRP bars ranged between 5% and 10% of the maximum load. The ductility and confinement efficiency can be better improved by using small GFRP spirals with closer spacing rather than larger diameters with greater spacing. Ignoring the contribution of GFRP bars in the design equation underestimated the maximum capacity of the tested specimens.
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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 the 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
Information
Published In
Journal of Composites for Construction
Volume 18 • Issue 1 • February 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Apr 20, 2013
Accepted: Aug 26, 2013
Published online: Sep 25, 2013
Published in print: Feb 1, 2014
Discussion open until: Feb 25, 2014
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