Shear Strength of Large Concrete Members with FRP Reinforcement
Publication: Journal of Composites for Construction
Volume 14, Issue 6
Abstract
Increasing interest in the use of fiber-reinforced polymer (FRP) reinforcement for reinforced concrete structures has made it clear that insufficient information about the shear performance of such members is currently available to practicing engineers. This paper summarizes the results of 11 large shear tests of reinforced concrete beams with glass FRP (GFRP) longitudinal reinforcement and with or without GFRP stirrups. Test variables were the member depth, the member flexural reinforcement ratio, and the amount of shear reinforcement provided. Results showed that the equations of the Canadian CSA shear provisions provide conservative estimates of the shear strength of FRP-reinforced members. Recommendations are given along with a worked example on how to apply these provisions including to members with FRP stirrups. It was found that members with multiple layers of longitudinal bars appear to perform better than those with a single layer of longitudinal reinforcing bars. Overall, it was concluded that the fundamental shear behavior of FRP-reinforced beams is similar to that of steel-reinforced beams despite the brittle nature of the reinforcement.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The material property tests on the FRP reinforcement were performed by Richard Yee as part of his undergraduate thesis. The research summarized in this paper was funded by the Natural Sciences and Engineering Research Council of Canada. Their long-term support of shear research at the University of Toronto is greatly appreciated.NSERC
References
AASHTO LRFD. (2004). Bridge design specifications and commentary, 3rd Ed., Washington, D.C.
American Concrete Institute (ACI). (2006). Guide for the design and construction of structural concrete reinforced with FRP bars, ACI Committee 440, Detroit.
Angelakos, D., Bentz, E. C., and Collins, M. P. (2001). “Effect of concrete strength and minimum stirrups on shear strength of large members.” ACI Struct. J., 98(3), 290–300.
Ashour, A. F. (2006). “Flexural and shear capacities of concrete beams reinforced with GFRP bars.” Constr. Build. Mater., 20(10), 1005–1015.
Bazant, Z. P., and Kim, J. -K. (1984). “Size effect in shear failure of longitudinally reinforced beams.” ACI J., 81(5), 456–468.
Bentz, E. C. (2000). “Sectional analysis of reinforced concrete members.” Ph.D. thesis, Dept. of Civil Engineering, Univ. of Toronto, Ont., Canada.
Bentz, E. C. (2005). “Empirical modeling of reinforced concrete shear strength size effect for members without stirrups.” ACI Struct. J., 102(2), 232–241.
Bentz, E. C. (2009). “Response-2000 sectional analysis program.” ⟨http://www.ecf.utoronto.ca/~bentz/r2k.htm⟩ (Aug. 21, 2009).
Bentz, E. C., and Collins, M. P. (2006). “Development of the 2004 CSA A23.3 shear provisions for reinforced concrete.” Can. J. Civ. Eng., 33(5), 521–534.
Castro, P. F., and Carino, N. J. (1998). “Tensile and non-destructive testing of FRP bars.” J. Compos. Constr., 2(1), 17–22.
Collins, M. P., Bentz, E. C., and Sherwood, E. G. (2008). “Where is shear reinforcement required? A review of research results and design procedures.” ACI Struct. J., 105(5), 590–600.
CSA. (2004). “Design of concrete structures.” CSA A23.3-04, Canadian Standards Association, Rexdale, Ont., Canada.
El-Sayed, A. K., El-Salakawy, E., and Benmokrane, B. (2006). “Shear strength of FRP-reinforced concrete beams without transverse reinforcement.” ACI Struct. J., 103(2), 235–243.
Hoult, N. A., Sherwood, E. G., Bentz, E. C., and Collins, M. P. (2008). “Does the use of FRP reinforcement change the one-way shear behavior of reinforced concrete slabs?” J. Compos. Constr., 12(2), 125–133.
Lubell, A., Sherwood, T., Bentz, E. C., and Collins, M. P. (2004). “Safe shear design of large, wide beams.” Concr. Int., 26(1), 66–78.
Lubell, A. S., Bentz, E. C., and Collins, M. P. (2009). “Influence of longitudinal reinforcement on one-way shear in slabs and beams.” ASCE Structural Journal, 135(1), 78–87.
Massam, L. (2001). “The behaviour of GFRP reinforced concrete beams in shear.” MS thesis, Dept. of Civil Engineering, Univ. of Toronto, Ont., Canada.
Michaluk, C., Rizkalla, S., Tadros, C., and Benmokrane, B. (1998). “Flexural behaviour of one-way slabs reinforced by fiber plastic reinforcement.” ACI Struct. J., 95(3), 353–365.
Niwa, J., Yamada, K., Kokozawa, K., and Okamura, M. (1987). “Revaluation of the equation for shear strength of reinforced concrete-beams without web reinforcement.” Concrete Library of JSCE, 9, 65–84.
Sherwood, E. G. (2008). “One-way shear behaviour of large, lightly-reinforced concrete beams and slabs.” Ph.D. thesis, Dept. of Civil Engineering, Univ. of Toronto, Ont., Canada.
Tureyen, A. K., and Frosch, R. J. (2003). “Concrete shear strength: Another perspective.” ACI Struct. J., 100(5), 609–615.
Vecchio, F. J., and Collins, M. P. (1986). “The modified compression field theory for reinforced concrete elements subjected to shear.” J. Am. Concr. Inst., 83(2), 219–231.
Information & Authors
Information
Published In
Copyright
© 2010 ASCE.
History
Received: Sep 7, 2009
Accepted: Jan 28, 2010
Published online: Feb 4, 2010
Published in print: Dec 2010
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.