Effect of Fiber-Reinforced Polymer Confinement on Bond Strength of Reinforcement in Beam Anchorage Specimens
Publication: Journal of Composites for Construction
Volume 9, Issue 1
Abstract
This paper reports on the fourth phase of a multiphase study undertaken at the American University of Beirut (AUB) to examine the effect of fiber-reinforced polymer (FRP) sheets in confining bond-critical regions in reinforced concrete beams. Results of the first three phases showed that glass- and carbon-fiber-reinforced polymer (GFRP and CFRP) sheets were effective in increasing the bond strength and improving the ductility of the mode of failure of tension lap splices in high-strength concrete (HSC) and normal-strength concrete (NSC) beams. The main objective of the fourth phase of the AUB study was to assess the effect of CFRP sheets in improving the serviceability and ultimate response of beam anchorage specimens. The added experimental data and the improved knowledge of the bond behavior of FRP confined concrete members will encourage the use of FRP technology to strengthen and retrofit bond anchorage zones. Ten beam anchorage specimens were tested in positive bending in two series. The variables were bar size, anchorage length, and concrete strength. For each bar size, anchorage length, and concrete strength, two companion specimens—identical except for whether the anchorage zone was wrapped with FRP sheets or not wrapped—were tested. The test results demonstrated that CFRP sheets were effective in enhancing the bond strength and ductility of anchorage zones in beam anchorage specimens where splitting failures were imminent.
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Acknowledgments
The writers gratefully acknowledge the assistance of Mr. Helmi Khatib, supervisor of the civil engineering testing labs at AUB, in all the stages of the study. The material donation by SIKA Canada is greatly appreciated.
References
American Concrete Institute (ACI). (2002). “State-of-the-art report on fiber reinforced plastic (FRP) reinforcement for concrete structures.” ACI 440R-96, Farmington Hills, Mich.
Darwin, D., Zuo, J., Tholen, M. L., and Idun, E. K. (1996). “Development length criteria for conventional and high relative Rib area reinforcing bars.” ACI Struct. J., 93(3), 347–359.
Hamad, B. S., Rteil, A. A., and Soudki, K. A. (2004a). “Bond Strength of Tension Lap Splices in High-Strength Concrete Beams Strengthened with Glass Fiber Reinforced Polymer Wraps.” J. Compos. Constr., 8(1), 14–21.
Hamad, B. S., Rteil, A. A., Salwan, B. R., and Soudki, K. A. (2004b). “Behavior of bond critical regions wrapped with FRP sheets in normal and high strength concrete.” J. Compos. Constr., 8(3), 248–257.
Hamad, B. S., Soudki, K. A., Harajli, M. H., and Rteil, A. A. (2004c). “Experimental and Analytical Evaluation of the Bond Strength of Reinforcement in FRP Wrapped HSC Beams,” ACI Struct J.101(6), 747-754.
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© 2005 ASCE.
History
Received: Sep 8, 2003
Accepted: May 3, 2004
Published online: Feb 1, 2005
Published in print: Feb 2005
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