Posttensioned FRP Composite Shells for Concrete Confinement
Publication: Journal of Composites for Construction
Volume 11, Issue 1
Abstract
Experiments have shown that externally bonded fiber-reinforced polymer (FRP) jackets for square and rectangular columns are not as effective as they are for circular columns. The results of experiments on shape-modified concrete columns using posttensioned FRP shells are presented. Posttensioning was achieved by radially straining the precured FRP shell outwards to a substantial strain level, using expansive cement concrete, over a period of . The prefabricated FRP shell was also used as a stay-in-place formwork. The effectiveness of shape modification using posttensioned FRP shells is compared to FRP-confined original square and rectangular columns, as well as shape-modified columns with nonshrink grout and externally bonded FRP jackets. It is shown that shape modification with posttensioning of FRP shells, using expansive cement concrete, can change the confinement from passive to active and improve significantly the axial strength and ultimate compressive axial strain capacity of square and rectangular columns.
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Acknowledgments
The writers would like to acknowledge financial support by the Utah Department of Transportation, the contribution of FRP composite materials from Sika and Air Logistics, and the contribution of Type K cement and Komponent from CTS Company. The writers acknowledge the constructive comments made by the reviewers.
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© 2007 ASCE.
History
Received: Jun 24, 2005
Accepted: Mar 24, 2006
Published online: Feb 1, 2007
Published in print: Feb 2007
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