Behavior and Effectiveness of FRP Wrap in the Confinement of Large Concrete Cylinders
Publication: Journal of Composites for Construction
Volume 14, Issue 5
Abstract
This paper presents the results of an experimental investigation on the strength and behavior of large 250 mm diameter concentrically loaded unreinforced fiber-reinforced polymer (FRP) confined concrete cylinders. In this study, the effect of the number of layers of the FRP and different overlap locations on the effectiveness of the FRP wrap is determined. Discontinuous versus continuous wrapping configurations to confine the cylinder are also investigated. To quantify the level of strain in the wrap and to aid in developing a deeper understanding of the behavior of these larger sized test specimens, an extensive array of electrical resistance strain gauges is used in addition to electronic speckle pattern interferometry (ESPI) optical measurement at selected locations. The ESPI results prove especially powerful in confirming the existence of strain concentrations at the ends of the overlap region, which may contribute to rupture failure of the wrap. The strain gauges in turn enable the effectiveness of the FRP to be quantified in addition to the distribution of hoop strain in the overlap and nonoverlap regions. Also of interest in these tests is identification of the occurrence of interfacial failure between the FRP and concrete at the FRP rupture failure position. Finally, the test results are found to correlate reasonably well with the ACI 440.2R-08 predictions for FRP-confined concrete columns.
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Acknowledgments
Mr. Ka Wai Lau (final year undergraduate project student) and Mr. Shenghua Hu (M.Phil. candidate) from the Department of Civil Engineering, The University of Hong Kong (HKU) are thanked for their contributions to the experimental and data manipulation phases of this project. Assistants from the Structural and Materials Testing Laboratories at HKU are also thanked for their contributions to the experimental work.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 14 • Issue 5 • October 2010
Pages: 573 - 582
Copyright
© 2010 ASCE.
History
Received: Nov 19, 2009
Accepted: Mar 10, 2010
Published online: Mar 12, 2010
Published in print: Oct 2010
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