Mechanisms of Shear Resistance of Concrete Beams Strengthened in Shear with Externally Bonded FRP
Publication: Journal of Composites for Construction
Volume 12, Issue 5
Abstract
In recent years, numerous investigations have addressed the shear strengthening of reinforced concrete (RC) beams with externally bonded fiber-reinforced polymer (FRP) composites. Despite this research effort, the mechanisms of shear resistance that are developed in such a strengthening system have not yet been fully documented and explained. This clearly inhibits the development of rational and reliable code specifications. This paper aims to contribute to the understanding of the shear resistance mechanisms involved in RC beams strengthened in shear with externally bonded FRP. It is based on results obtained from an experimental program, involving 17 tests, performed on full size T beams, and using a comprehensive and carefully optimized measuring device. The resistance mechanisms are studied by observing the evolution of the behavior of the strengthened beams as the applied loads are increased. The local behavior of the FRP and the transverse steel, in particular in the failure zones, are thoroughly examined. The operative resistance mechanisms are also studied through the load sharing among the concrete, the FRP, and the transverse steel, at increasing levels of applied load.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The financial support of the National Science and Engineering Research Council of Canada (NSERC) and the Fonds Québécois de la Recherche sur la Nature et les Technologies (FQRNT) through an operating grant is gratefully acknowledged.
References
American Concrete Institute (ACI). (2002). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.” ACI 440 2R-02, ACI Committee 440, Farmington Hills, Mich.
American Concrete Institute (ACI). (2005). “Building code requirements for structural concrete and commentary.” ACI 318 R-05 and ACI 318 R-05, ACI Committee 318, Farmington Hills, Mich.
ASTM. (1997). “Standard test methods and definitions for mechanical testing of steel products.” ASTM A370–97a, West Conshohocken, Pa.
Bousselham, A. (2005). “Shear strengthening reinforced concrete beams with fiber-reinforced polymer.” Ph.D. thesis, Dept. of Construction Engineering, École de Technologie Supérieure, Univ. du Québec, Montreal (in French).
Bousselham, A., and Chaallal, O. (2004). “Shear strengthening reinforced concrete beams with fiber-reinforced polymer: Assessment of influencing parameters and required research.” ACI Struct. J., 101(2), 219–227.
Bousselham, A., and Chaallal, O. (2006a). “Behavior of RC T-beams strengthened in shear with CFRP: An experimental study.” ACI Struct. J., 103(3), 339–347.
Bousselham, A., and Chaallal, O. (2006b). “Effect of transverse steel and shear span on the performance of RC beams strengthened in shear with CFRP.” Composites, Part B, 37(1), 37–46.
Bousselham, A., Chaallal, O., Hassan, M., and Benmokrane, B. (2003). “Shear strengthening of concrete structures with FRP: A critical review of code design provisions.” Proc., 31st Annual Conf. of the Canadian Society for Civil Engineering, CSCE, M. Massiéra and G. Poitras, eds., Canadian Society of Civil Engineering, Montreal, Que., Canada, 2065–2074.
Canadian Standards Association International (CSA). (2002). “Design and construction of building components with fibre-reinforced polymer.” CSA-S8-06, Toronto.
Cao, S. Y., Chen, J. F., Teng, J. G., Hao, Z., and Chen, J. (2005). “Debonding in RC beams shear strengthened with complete FRP wraps.” J. Compos. Constr., 9(5), 417–428.
Carolin, A., and Taljsten, B. (2005a). “Experimental study of strengthening for increased shear bearing capacity.” J. Compos. Constr., 9(6), 488–496.
Carolin, A., and Taljsten, B. (2005b). “Theoretical study of strengthening for increased shear bearing capacity.” J. Compos. Constr., 9(6), 488–496.
Chaallal, O., Shahawy, M., and Hassan, M. (2002). “Performance of reinforced concrete T-girders strengthened in shear with CFRP fabrics.” ACI Struct. J., 99(3), 335–343.
Chen, J. F., and Teng, J. G. (2003). “Shear capacity of fiber-reinforced polymer-strengthened reinforced concrete beams: Fiber reinforced polymer rupture.” J. Struct. Eng., 129(5), 615–625.
Colotti, V., Spadea, G., and Swamy, R. N. (2004). “Analytical model to evaluate failure behavior of plated reinforced concrete beams strengthened for shear.” ACI Struct. J., 101(6), 755–764.
Concrete Society. (2000). “Design guidance for strengthening concrete structures using fibre composite materials.” Technical Rep. No. 55, Crowthorne, U.K.
Czaderski, C., and Motavalli, M. (2004). “Fatigue behavior of CFRP L-shaped plates for shear strengthening of RC T-beams.” Composites, Part B, 35(4), 279–290.
Deniaud, C., and Cheng, J. J. R. (2004). “Simplified shear design method for concrete beams strengthened with fiber reinforced polymer sheets.” J. Compos. Constr., 8(5), 425–433.
Fédération Internationale du Béton (fib). (2001). “Externally bonded FRP reinforcement for RC structures.” Bulletin No. 14, Lausanne, Switzerland.
Kim, J.-K., and Park, Y.-D. (1996). “Prediction of shear strength of reinforced concrete beams without web reinforcement.” ACI Mater. J., 93(3), 213–222.
Kuchma, D. A., and Kim, K. S. (2001). “Stress limits and minimum reinforcement requirements in shear design provisions.” ACM Trans. Off. Inf. Sys., 3(4), 317–325.
Li, A., Diagana, C., and Delmas, Y. (2002). “Shear strengthening effect by bonded composite fabrics on RC beams.” Composites, Part B, 33(3), 225–239.
Pellegrino, C., and Modena, C. (2002). “Fiber reinforced polymer shear strengthening of RC beams with transverse steel reinforcement.” J. Compos. Constr., 6(2), 104–111.
Tureyen, A. K., and Frosch, R. J. (2003). “Concrete shear strength: Another perspective.” ACI Struct. J., 100(5), 609–615.
Zhang, Z., Hsu, C.-T. T., and Moren, J. (2005). “Shear strengthening of reinforced concrete deep beams using carbon fiber reinforced polymer laminates.” J. Compos. Constr., 8(5), 403–414.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 12 • Issue 5 • October 2008
Pages: 499 - 512
Copyright
© 2008 ASCE.
History
Received: Jan 29, 2007
Accepted: Nov 28, 2007
Published online: Oct 1, 2008
Published in print: Oct 2008
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.