Torsional Capacity of CFRP Strengthened Reinforced Concrete Beams
Publication: Journal of Composites for Construction
Volume 11, Issue 1
Abstract
Many buildings and bridge elements are subjected to significant torsional moments that affect the design, and may require strengthening. Fiber-reinforced polymer (FRP) has shown great promise as a state-of-the-art material in flexural and shear strengthening as external reinforcement, but information on its applicability in torsional strengthening is limited. Furthermore, available design tools are sparse and unproven. This paper briefly recounts the experimental work in an overall investigation of torsional strengthening of solid and box-section reinforced concrete beams with externally bonded carbon fiber-reinforced polymer (CFRP). A database of previous experimental research available in literature was compiled and compared against fib Bulletin 14. Modifications consistent with the space truss model were proposed to correct the poor accuracy in predictions of CFRP contribution to strength. Subsequently, a design tool to analyze the full torsional capacity of strengthened reinforced concrete beams was validated against the experimental database.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The research reported in this paper is part of a study financed by a Monash University Engineering Grant. All CFRP fabrics and adhesives were partly sponsored by MBT (Australia) Pty Ltd.
References
Ameli, M., Ronagh, H. R., and Dux, P. F. (2004). “Experimental Investigations on FRP strengthening of beams in torsion.” FRP Composites in Civil Engineering - CICE 2004, Adelaide, Australia, Taylor and Francis, London, 587–592.
American Concrete Institute (ACI) Committee 318. (2005). “Building code requirements for structural concrete.” ACI 318-05, American Concrete Institute, Detroit.
fib Bulletin 14. (2001). “Externally bonded FRP reinforcement for RC structures.” fib - International Federation for Structural Concrete, Lausanne, Switzerland.
Ghobarah, A., Ghorbel, M. N., and Chidiac, S. E. (2002). “Upgrading torsional resistance of reinforced concrete beams using fiber-reinforced polymer.” J. Compos. Constr., 6(4), 257–263.
Gosbell, T., and Meggs, R. (2002). “West Gate bridge approach spans FRP strengthening Melbourne, Australia.” IABSE Symposium Melbourne, Melbourne, IABSE, Zurich.
Hii, A. K. Y., and Al-Mahaidi, R. (2004). “Torsional strengthening of reinforced concrete beams using CFRP composites.” FRP Composites in Civil Engineering - CICE 2004, Adelaide, Australia, Taylor and Francis, London, 551–559.
Hii, A. K. Y., and Al-Mahaidi, R. (2005). “Torsional strengthening of solid and box-section RC beams using CFRP composites.” Composites in Construction 2005-Third Int. Conf., Lyon, France, Université Lyon I, Lyon, 59–68.
Hii, A. K. Y., and Al-Mahaidi, R. (2006). “Experimental investigation on torsional behaviour of solid and box-section RC beams strengthened with CFRP using photogrammetry.” J. Compos. Constr., 10(4), 321–329.
Hsu, T. T. C. (1993). Unified theory of reinforced concrete, CRC, Boca Raton, Fla.
Hsu, T. T. C., and Mo, Y. L. (1985). “Softening of concrete in torsional members—Design recommendations.” ACI J., 82(4), 443–452.
Lee, T. K., and Al-Mahaidi, R. (2003). “Strength and failure mechanisms of reinforced concrete T-beams strengthened with CFRP plates.” 6th Int. Symp. on Fibre-Reinforced Polymer (FRP) Reinforcement for Concrete Structures (FRPRCS-6), Singapore, World Scientific, Singapore.
Panchacharam, S., and Belarbi, A. (2002). “Torsional behaviour of reinforced concrete beams strengthened with FRP composites.” FIB Congress, Osaka, Japan, fib—International Federation for Structural Concrete, Lausanne, Switzerland.
Pham, H. B., and Al-Mahaidi, R. (2004). “Experimental investigation into flexural retrofitting of reinforced concrete bridge beams using FRP composites.” Compos. Struct., 66, 617–625.
Salom, P. R., Geirgely, J., and Young, D. T. (2004). “Torsional strengthening of spandrel beams with fiber-reinforced polymer laminates.” J. Compos. Constr., 8(2), 157–162.
Standards Australia International (SAI). (2001). AS3600-2001-Concrete Structures, Standards Australia International Ltd., Sydney, Australia.
Triantafillou, T. C., and Antonopoulos, C. P. (2000). “Design of concrete flexural members strengthened in shear with FRP.” J. Compos. Constr., 4(4), 198–205.
Zhang, J. W., Lu, Z. T., and Zhu, H. (2001). “Experimental study on the behaviour of RC torsional members externally bonded with CFRP.” FRP Composites in Civil Engineering, 1, 713–722.
Information & Authors
Information
Published In
Copyright
© 2007 ASCE.
History
Received: Feb 24, 2006
Accepted: May 12, 2006
Published online: Feb 1, 2007
Published in print: Feb 2007
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.