Flexural Behavior of Continuous FRP-Reinforced Concrete Beams
Publication: Journal of Composites for Construction
Volume 14, Issue 6
Abstract
Continuous concrete beams are commonly used elements in structures such as parking garages and overpasses, which might be exposed to extreme weather conditions and the application of deicing salts. The use of the fiber-reinforced polymers (FRP) bars having no expansive corrosion product in these types of structures has become a viable alternative to steel bars to overcome the steel-corrosion problems. However, the ability of FRP materials to redistribute loads and moments in continuous beams is questionable due to the linear-elastic behavior of such materials up to failure. This paper presents the experimental results of four reinforced concrete beams with rectangular cross section of continuous over two spans of 2,800 mm each. The material and the amount of longitudinal reinforcement were the main investigated parameters in this study. Two beams were reinforced with glass FRP (GFRP) bars in to different configurations while one beam was reinforced with carbon FRP bars. A steel-reinforced continuous concrete beam was also tested to compare the results. The experimental results showed that moment redistribution in FRP-reinforced continuous concrete beams is possible if the reinforcement configuration is chosen properly. Increasing the GFRP reinforcement at the midspan section compared to middle support section had positive effects on reducing midspan deflections and improving load capacity. The test results were compared to the available design models and FRP codes. It was concluded that the Canadian Standards Association Code (CSA/S806-02) could reasonably predict the failure load of the tested beams; however, it fails to predict the failure location.
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Acknowledgments
The writers wish to express their gratitude and sincere appreciation for the financial support received from the Natural Science and Engineering Research Council of Canada (NSERC), through Canada Research Chairs program. The equipment funds provided by Canada Fund for Innovation (CFI) and the Manitoba Research Innovation Fund (MRIF) are greatly appreciated. The help received from the technical staff of the McQuade Heavy Structural Laboratory in the department of civil engineering at the University of Manitoba is also acknowledged.
References
Abdalla, H. (2002). “Evaluation of deflection in concrete members reinforced with fiber reinforced polymer (FRP) bars.” Compos. Struct., 56(1), 63–71.
American Concrete Institute (ACI). (2004). “Guide test methods for fiber reinforced polymers (FRPs) for reinforcing or strengthening concrete structures.” ACI 440.3R-04, Farmington Hills, Mich.
American Concrete Institute (ACI). (2006). “Guide for the design and construction of concrete reinforced with FRP bars.” ACI 440.1R-06, Farmington Hills, Mich.
American Concrete Institute (ACI). (2008). “Building code requirements for structural concrete and commentary.” ACI 318-08 and ACI 318R-08, Farmington Hills, Mich.
Bischoff, P. H. (2007). “Deflection calculation of FRP reinforced concrete beams based on modifications to the existing Branson equation.” J. Compos. Constr., 11(1), 4–14.
Canadian Standards Association (CSA). (2002). “Design and construction of building components with fibre-reinforced polymers.” CSA Standard S806-02, Rexdale, Ont., Canada.
Canadian Standards Association (CSA). (2004). “Design of concrete structures.” CSA Standard A23.3-04, Rexdale, Ont., Canada.
Canadian Standards Association (CSA). (2006). “Canadian highway bridge design code.” CSA Standard S6-06, Rexdale, Ont., Canada.
Carmo, R. N. F., and Lopes, S. M. (2006). “Required plastic rotation of RC beams.” Proc. Inst. Civ. Eng., Struct. Build., 159(2), 77–86.
El-Salakawy, E. F., and Benmokrane, B. (2004). “Serviceability of concrete bridge deck slabs reinforced with FRP composite bars.” ACI Struct. J., 101(5), 727–736.
Grace, N. F., Soliman, A. K., Abdel-Sayed, G., and Saleh, K. R. (1998). “Behavior and ductility of simple and continuous FRP reinforced beams.” J. Compos. Constr., 2(4), 186–194.
Gravina, R. J., and Smith, S. T. (2008). “Flexural behaviour of indeterminate concrete beams reinforced with FRP bars.” Eng. Struct., 30(9), 2370–2380.
Habeeb, M. N., and Ashour, A. F. (2008). “Flexural behavior of continuous GFRP reinforced concrete beams.” J. Compos. Constr., 12(2), 115–124.
ISIS Canada. (2007). “Reinforcing concrete structures with fibre reinforced polymers.” Design manual no. 3, Winnipeg, Canada.
Mota, C., Alminar, S., and Svecova, D. (2006). “Critical review of deflection formulas for FRP reinforced concrete.” J. Compos. Constr., 10(3), 183–194.
Pultrall Inc. (2009). “V-ROD—Technical data sheet.” ADS Composites Group Inc., ⟨http://www.pultrall.com⟩ (Jan. 1, 2010).
Rasheed, H. A., Nayal, R., and Melhem, H. (2004). “Response prediction of concrete beams reinforced with FRP bars.” Compos. Struct., 65(2), 193–204.
Razaqpur, A. G., and Mostofinejad, D. (1999). “Experimental study for shear behavior of continuous beams reinforced with carbon fiber reinforced polymer.” Proc., 4th Int. Symp., Fiber Reinforced Polymer Reinforcement for Reinforced Concrete Structures, American Concrete Institute, Farmington Hills, Mich., 169–178.
Razaqpur, A. G., Svecova, D., and Cheung, M. S. (2000). “Rational method for calculating deflection of fiber-reinforced polymer reinforced beams.” ACI Struct. J., 97(1), 175–185.
Scholz, H. (1993). “Contribution to redistribution of moments in continuous reinforced concrete beams.” ACI Struct. J., 90(2), 150–155.
Theriault, M., and Benmokrane, B. (1998). “Effects of FRP reinforcement ratio and concrete strength on flexural behavior of concrete beams.” J. Compos. Constr., 2(1), 7–16.
Toutanji, H. A., and Saafi, M. (2000). “Flexural behaviour of concrete beams reinforced with glass fiber-reinforced polymer (GFRP) bars.” ACI Struct. J., 97(5), 712–719.
Vijay, P. V., and GangaRao, H. V. (2001). “Bending behaviour and deformability of glass fiber-reinforced polymer reinforced concrete members.” ACI Struct. J., 98(6), 834–842.
Yost, J. R., and Gross, S. P. (2002). “Flexure design methodology for concrete beams reinforced with fiber-reinforced polymers.” ACI Struct. J., 99(3), 308–316.
Yost, J. R., Gross, S. P., and Dinehart, D. W. (2003). “Effective moment of inertia for glass fiber-reinforced polymer-reinforced concrete beams.” ACI Struct. J., 100(6), 732–739.
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Information
Published In
Journal of Composites for Construction
Volume 14 • Issue 6 • December 2010
Pages: 669 - 680
Copyright
© 2010 ASCE.
History
Received: Nov 11, 2009
Accepted: May 4, 2010
Published online: May 12, 2010
Published in print: Dec 2010
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