Impact Behavior of FRP-Strengthened RC Beams without Stirrups
Publication: Journal of Composites for Construction
Volume 20, Issue 4
Abstract
This study investigates the impact behavior of fiber-reinforced polymer (FRP)-strengthened reinforced concrete (RC) beams and FRP contribution to shear strength. Thirteen RC beams () were tested against static and impact loads. The beams were strengthened with FRP U-wraps and 45°-angle wraps to investigate the effectiveness of different wrapping schemes. The experimental results show that the debonding strain of FRP under impact loads is slightly smaller than that under static loads. The FRP contribution to shear strength is discussed and verified against a design code. In terms of using the same amount of FRP, 45°-angle FRP wraps provide better performance than the FRP U-wraps in terms of both the load capacity and displacement. Fully wrapping a RC beam with FRP is more efficient than wrapping distributed FRP strips. The impact behavior and failure modes of FRP strengthened RC beams are also discussed.
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References
ACI (American Concrete Institute). (2008). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.” ACI 440.2 R-08, Farmington Hills, MI.
ASTM. (2008). “Standard test method for tensile properties of polymer matrix composite materials.” ASTM D3039, West Conshohocken, PA.
Banthia, N., Mindess, S., and Bentur, A. (1989a). “Energy balance in instrumented impact tests on plain concrete beams.” Fracture of concrete and rock, Springer, New York, 26–36.
Banthia, N., Mindess, S., Bentur, A., and Pigeon, M. (1989b). “Impact testing of concrete using a drop-weight impact machine.” Exp. Mech., 29(1), 63–69.
Banthia, N. P., Mindess, S., and Bentur, A. (1987). “Impact behaviour of concrete beams.” Mater. Struct., 20(4), 293–302.
Bhatti, A. Q., Kishi, N., Mikami, H., and Ando, T. (2009). “Elasto-plastic impact response analysis of shear-failure-type RC beams with shear rebars.” Mater. Des., 30(3), 502–510.
Buchan, P. A., and Chen, J. F. (2007). “Blast resistance of FRP composites and polymer strengthened concrete and masonry structures—A state-of-the-art review.” Compos. Part B: Eng., 38(5–6), 509–522.
Buyukozturk, O., Gunes, O., and Karaca, E. (2004). “Progress on understanding debonding problems in reinforced concrete and steel members strengthened using FRP composites.” Constr. Build. Mater., 18(1), 9–19.
Cotsovos, D., Stathopoulos, N., and Zeris, C. (2008). “Behavior of RC beams subjected to high rates of concentrated loading.” J. Struct. Eng., 1839–1851.
Cotsovos, D. M. (2010). “A simplified approach for assessing the load-carrying capacity of reinforced concrete beams under concentrated load applied at high rates.” Int. J. Impact Eng., 37(8), 907–917.
Erki, M., and Meier, U. (1999). “Impact loading of concrete beams externally strengthened with CFRP laminates.” J. Compos. Constr., 117–124.
Fujikake, K., Li, B., and Soeun, S. (2009). “Impact response of reinforced concrete beam and its analytical evaluation.” J. Struct. Eng., 938–950.
Hadi, M. N. S., Pham, T. M., and Lei, X. (2013). “New method of strengthening reinforced concrete square columns by circularizing and wrapping with fiber-reinforced polymer or steel straps.” J. Compos. Constr., 229–238.
Hamed, E., and Rabinovitch, O. (2005). “Dynamic behavior of reinforced concrete beams strengthened with composite materials.” J. Compos. Constr., 429–440.
Isaac, P. M. (2014). “Effects of extreme impulsive loads on RC structures with a view to strengthening.” Ph.D. dissertation, Univ. of Bath, North East Somerset, U.K.
MacGregor, J. G. (2005). Reinforced concrete: Mechanics and design, Prentice Hall, Upper Saddle River, NJ.
Pham, T. M., Doan, L. V., and Hadi, M. N. S. (2013). “Strengthening square reinforced concrete columns by circularisation and FRP confinement.” Constr. Build. Mater., 49, 490–499.
Pham, T. M., Hadi, M. N. S., and Tran, T. M. (2015a). “Maximum usable strain of FRP-confined concrete.” Constr. Build. Mater., 83, 119–127.
Pham, T. M., Hadi, M. N. S., and Youssef, J. (2015b). “Optimized FRP wrapping schemes for circular concrete columns.” J. Compos. Constr., 04015015.
Saatci, S., and Vecchio, F. J. (2009). “Effects of shear mechanisms on impact behavior of reinforced concrete beams.” ACI Struct. J., 106(1), 78–86.
Smith, S. T., and Teng, J. G. (2001). “Interfacial stresses in plated beams.” Eng. Struct., 23(7), 857–871.
Smith, S. T., and Teng, J. G. (2002). “FRP-strengthened RC beams. I: Review of debonding strength models.” Eng. Struct., 24(4), 385–395.
Tang, T., and Saadatmanesh, H. (2003). “Behavior of concrete beams strengthened with fiber-reinforced polymer laminates under impact loading.” J. Compos. Constr., 209–218.
Tang, T., and Saadatmanesh, H. (2005). “Analytical and experimental studies of fiber-reinforced polymer-strengthened concrete beams under impact loading.” ACI Struct. J., 102(1), 139–149.
West System. (2015). “Epoxy resins and hardeners—Physical properties.” 〈http://www.westsystem.com/ss/typical-physical-properties〉 (Jan. 31, 2015).
White, T., Soudki, K., and Erki, M. (2001). “Response of RC beams strengthened with CFRP laminates and subjected to a high rate of loading.” J. Compos. Constr., 153–162.
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Published In
Journal of Composites for Construction
Volume 20 • Issue 4 • August 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Aug 31, 2015
Accepted: Nov 25, 2015
Published online: Jan 20, 2016
Discussion open until: Jun 20, 2016
Published in print: Aug 1, 2016
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