Behavior of Wide Shallow RC Beams Strengthened with CFRP Reinforcement
Publication: Journal of Composites for Construction
Volume 16, Issue 4
Abstract
One-way reinforced concrete joist floors with wide shallow beams (WSBs) are used widely in building construction throughout the Middle East. The short- and long-term behavior of WSBs externally strengthened with carbon fiber-reinforced polymer (CFRP) reinforcement was studied on isolated beams and as part of full-scale building. This paper presents the results of the experimental investigation on the flexural performance of isolated WSBs externally strengthened with CFRP reinforcement. A total of six full-scale beams were constructed and tested to failure. The test variables were the amount, type, configuration, and the elastic modulus of CFRP reinforcement. The test results were presented in terms of deflections, ultimate capacities and modes of failure, crack width development, and strains in reinforcement and concrete. The test results showed significant improvement in the flexural performance of the strengthened beams with respect to flexural capacity, flexural stiffness, and crack width. All but one of the strengthened beams failed because of the debonding of CFRP reinforcement; however, the load carrying capacity of WSBs were more than that predicted by relevant design guidelines.
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Acknowledgments
The authors would like to acknowledge the financial support from the Center of Excellence for Research in Engineering Materials (CEREM) at the College of Engineering—King Saud University (P. O. Box 800, Riyadh 11421, Saudi Arabia). The help of engineers and technicians in the Center of Excellence for Concrete Research & Testing (CoE-CRT) and in the structural laboratory of Civil Engineering Department at King Saud University is highly appreciated.
References
Al-Negheimish, A. I., Shuraim, A. B., Al-Zaid, R. Z., Alhozaimy, A. M., El-Sayed, A. K. (2011). “Innovative procedure for strengthening wide shallow beam floor system using CFRP reinforcement.” 2nd Year Progress rep., Submitted to Center of Excellence for Research in Engineering Materials (CEREM), King Saud Univ., Kingdom of Saudi Arabia.
American Concrete Institute (ACI). (2008). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.” ACI 440.2R-08, American Concrete Institute, Detroit.
American Concrete Institute (ACI). (2002). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.” ACI 440.2R-02, American Concrete Institute, Detroit.
Aram, M. R., Czaderski, C., and Motavalli, M. (2008). “Debonding failure modes of flexural FRP-strengthened RC beams.” Composites Part BCPBEFF, 39, 826–841.
Bencardino, F., Spadea, G., and Swamy, R. N. (2002). “Strength and ductility of reinforced concrete beams externally reinforced with carbon fiber fabric.” ACI Struct. J.ASTJEG, 99(3), 163–171.
Bonaldo, E., Oliveira de Barros, J. A., and Lourenco, P. B. (2008). “Efficient strengthening technique to increase the flexural resistance of existing RC slabs.” J. Compos. Constr.JCCOF2, 12(2), 149–159.
Brosens, K. (2001). “Anchorage of externally bonded steel plates and CFRP laminates for the strengthening of concrete elements.” Ph.D. thesis, Catholic Univ. of Lueven, Belgium.
Ceroni, F., and Pecce, M. (2007). “Cracking behavior of RC beams externally strengthened with emerging materials.” Constr. Build. Mater.CBUMEZ, 21, 736–745.
Chen, J. F., and Teng, J. (2001). “Anchorage strength models for FRP and steel plates bonded to concrete.” J. Struct. Eng.JSENDH, 127(7), 784–791.
Fédération Internationale du Béton (FIB). (2001). “Externally bonded FRP reinforcement for RC structures.” Bulletin 14, Lausanne, Switzerland.
HKS. (2005). “ABAQUS—Users manuals and theory manual Version 6.6.” Pawtucket, RI.
Japan Society of Civil Engineers (JSCE). (1997). “Recommendations for upgrading of concrete structures with use of continuous fiber sheets.” Tokyo.
Kachlakev, D., and McCurry, D. D. (2000). “Behavior of full-scale reinforced concrete beams retrofitted for shear and flexural with FRP laminates.” Composites Part BCPBEFF, 31, 445–452.
Prota, A., Tan, K. Y., Nanni, A., Pecce, M., and Manfredi, G. (2006). “Performance of shallow reinforced concrete beams with externally bonded steel-reinforced polymer.” ACI Struct. J.ASTJEG, 103(2), 163–170.
Rabinovitch, O., and Frostig, Y. (2003). “Experimental and analytical comparison of RC beams strengthened with CFRP composites.” Composites Part BCPBEFF, 34, 663–673.
Rahimi, H., and Hutchinson, A. (2001). “Concrete beams strengthened with externally bonded FRP plates.” J. Compos. Constr.JCCOF2, 5(1), 44–56.
Rosenboom, O., and Rizkalla, S. (2008a). “Experimental study of intermediate crack debonding in fiber-reinforced polymer strengthened beams.” ACI Struct. J.ASTJEG, 105(1), 41–50.
Rosenboom, O., and Rizkalla, S. (2008b). “Modeling of IC debonding of FRP-strengthened concrete flexural members.” J. Compos. Constr.JCCOF2, 12(2), 168–179.
Shahawy, M., Chaallal, O., and Beitelman, T., and El-Saad, A. (2001). “Flexural strengthening with carbon fiber-reinforced polymer composites for preloaded full-scale girders.” ACI Struct. J.ASTJEG, 98(5), 735–742.
Shuraim, A. B. (2011). “Efficacy of CFRP Configurations for Shear of RC Beams.” Struct. Eng. Mech.SEGMEQ, 39(3), 361–382.
Shuraim, A. B., and Al-Negheimish, A. I. (2011). “Design considerations for joist floors with wide-shallow beams.” ACI Struct. J.ASTJEG, 108(2), 188–196.
Spadea, G., Bencardino, F., and Swamy, R. N. (1998). “Structural behavior of composite RC beams with externally bonded CFRP.” J. Compos. Constr.JCCOF2, 2(3), 132–139.
Teng, J. G., Smith, S. T., and Chen, J. F. (2003). “Intermediate crack-induced debonding in RC beams and slabs.” Constr. Build. Mater.CBUMEZ, 17, 447–462.
The Concrete Society. (2004). “Design guidance for strengthening concrete structures using fibre composite materials.” Technical Rep. 55, Surrey, UK.
Toutanji, H., Zhao, L., and Anselm, E. (2006). “Verifications of design equations of beams externally strengthened with FRP composites.” J. Compos. Constr.JCCOF2, 10(3), 254–264.
Yao, J., Teng, J. G., and Lam, L. (2005). “Experimental study on intermediate crack debonding in FRP-strengthened RC flexural members.” Adv. Struct. Eng., 8(4), 365–395.
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Information
Published In
Journal of Composites for Construction
Volume 16 • Issue 4 • August 2012
Pages: 418 - 429
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Apr 20, 2011
Accepted: Dec 15, 2011
Published online: Dec 20, 2011
Published in print: Aug 1, 2012
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