Strengthening RC T-Beams Subjected to Combined Torsion and Shear Using FRP Fabrics: Experimental Study
Publication: Journal of Composites for Construction
Volume 14, Issue 3
Abstract
In several cases of loading and geometrical configurations, flexure beams, and girders are subjected to combined shear and torsion. Failure of a structural element under combined shear and torsion is brittle in nature. Externally bonded fiber-reinforced polymer (FRP) fabrics are currently being studied and used for the rehabilitation, repair, and retrofit of concrete structure. The objective of this study is to investigate the strengthening techniques for T-beams subjected to combined shear and torsion. Six half-scale beams—two control specimen and four strengthened beams—were constructed and tested using a specially designed test setup that subjects the beam to combined shear and torsion with different ratios. Four strengthening techniques using carbon FRPs were tested. The experimental results were reported and analyzed to assess the effectiveness of the proposed strengthening techniques. An innovative strengthening technique namely the extended U-jacket showed promising results in terms of strength and ductility while being quite feasible for strengthening. Future areas of research are being outlined.
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References
Ameli, M., and Ronagh, H. R. (2007). “Analytical method for evaluating ultimate torque of FRP strengthened reinforced concrete beams.” J. Compos. Constr., 11(4), 384–390.
Ameli, M., Ronagh, H. R., and Dux, P. F. (2007). “Behavior of FRP strengthened reinforced concrete beams under torsion.” J. Compos. Constr., 11(2), 192–200.
American Concrete Institute (ACI). (2002). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.” ACI 440.2R-02, Detroit.
Canadian Standards Association. (2002). “Design and construction of building components with fiber-reinforced polymers.” CSA-S806-02, Rexdale, Canada.
Chalioris, C. E. (2007). “Analytical model for the torsional behaviour of reinforced concrete beams retrofitted with FRP materials.” Eng. Struct., 29(12), 3263–3276.
Chalioris, C. E. (2008). “Torsional strengthening of rectangular and flanged beams using carbon fibre-reinforced-polymers—Experimental study.” Constr. Build. Mater., 22(1), 21–29.
Deifalla, A. (2007). “Behavior and strengthening of RC T-girders in torsion and shear.” Ph.D. thesis, McMaster Univ., Hamilton, Ont., Canada.
Deifalla A, and Ghobarah A. (2005). “Simplified analysis of RC beams torsionally strengthened using FRP.” Proc., Int. Symp. on Bond Behaviour of FRP in Structures (BBFS 2005), Chen and Teng, eds., Hong Kong, China, 381–386.
FIB. (2001). “Externally bonded FRP reinforcement for RC structures.” CEB-FIP Technical Rep., 14, Task Group 9.3, International Federation for Structural Concrete, 200.
Fyfe Co. (2005). “BCC data sheet.” ⟨http://www.Fyfeco.com/products/compositesystems/Bcc.html⟩ (April 2005).
Ghobarah, A., Ghorbel, M., and Chidiac, S. (2002). “Upgrading torsional resistance of RC beams using FRP.” J. Compos. Constr., 6(4), 257–263.
Hii, A. K. Y., and Al-Mahaidi, R. (2007). “Torsional capacity of CFRP strengthened reinforced concrete beams.” J. Compos. Constr., 11(1), 71–80.
Holman, J. W., and Cook, J. P. (1984). “Steel plates for torsion repair of concrete beams.” J. Struct. Eng., 110(1), 10–18.
Karayannis, C. G., and Chalioris, C. E. (2003). “Strengthening of shear T-beams using carbon FRP.” Proc., 1st Int. Conf. on Concrete Repair, St-Malo, Brittany, France.
Panchacharam, S., and Belarbi, A. (2002). “Torsional behaviour of reinforced concrete beams strengthened with FRP composites.” 1st Congress on Concrete Structures in the 21st Century, Osaka, Japan.
Salom, P. R., Gergely, J. M., and Young, D. T. (2004). “Torsional strengthening of spandrel beams with fiber-reinforced polymer laminates.” J. Compos. Constr., 8(2), 157–162.
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Information
Published In
Journal of Composites for Construction
Volume 14 • Issue 3 • June 2010
Pages: 301 - 311
Copyright
© 2010 ASCE.
History
Received: Jun 9, 2009
Accepted: Nov 9, 2009
Published online: Feb 3, 2010
Published in print: Jun 2010
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