Axial Behavior of Square Reinforced Concrete Columns Strengthened with Lightweight Concrete Elements and Unbonded GFRP Wrapping
Publication: Journal of Composites for Construction
Volume 16, Issue 6
Abstract
This paper presents a new, efficient, and economic confinement technique for square reinforced concrete (RC) columns with unbonded glass fiber-reinforced polymer (GFRP) wrapping and lightweight concrete elements at the side faces. Three confined columns with different reinforcement ratios were tested under concentric axial force. The force-deformation responses show a distinctly increased load-carrying capacity at plastic deformations up to 4% average axial strain. This confinement technique is a considerable improvement for square columns with a large side-to-corner radius. Only a slight change in column geometry has to be accepted because of the use of unbonded lightweight concrete panels.
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Acknowledgments
The writers wish to express their appreciation to the assistance of laboratory technicians of Empa, the Swiss Federal Laboratories for Materials Science and Technology. Furthermore, Empa provided the financial support for the project. The writers also express their gratitude to the Sika Services AG Company for providing fiber sheet materials and laminating resin for this experimental program.
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Information
Published In
Journal of Composites for Construction
Volume 16 • Issue 6 • December 2012
Pages: 747 - 752
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Feb 9, 2012
Accepted: May 17, 2012
Published online: May 21, 2012
Published in print: Dec 1, 2012
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