Novel Test Method for Ultimate Hoop-Strain Characterization in FRP Jackets
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 12
Abstract
The use of externally bonded fiber-reinforced polymer (FRP) laminates is an effective solution to increase the strength and deformability of reinforced concrete columns. A critical parameter in predicting the ultimate strength of FRP-confined concrete is the ultimate circumferential (i.e., hoop) strain. This paper presents the development of a novel test method aimed at providing reliable experimental measurements of the ultimate hoop strain in FRP circular jackets with different laminate thickness and diameter. The proposed approach simulates the lateral expansion of concrete columns subjected to axial loads by enlisting the property of water (which expands when it changes state of matter from liquid to solid) as a medium to apply an internal hydrostatic pressure on cylindrical glass FRP (GFRP) jacket specimens. The average ultimate hoop strain results from 54 cylindrical GFRP-jacket specimens with different diameter and laminate thickness clearly indicate a lower level of strain than those found in similar flat coupon specimens. These results indicate that the test method is safe, user-friendly, and generates reliable measurements of the hoop strain in GFRP circular laminates in a more representative fashion than direct tensile tests.
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Acknowledgments
The financial support of the National Science Foundation NSFIndustry/University Cooperative Research Center for the Integration of Composites into Infrastructure (CICI) is gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 12 • December 2011
Pages: 1633 - 1641
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jul 29, 2010
Accepted: May 4, 2011
Published online: May 6, 2011
Published in print: Dec 1, 2011
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