Cracking Characteristics of RC Beams Strengthened with FRP System
Publication: Journal of Composites for Construction
Volume 12, Issue 5
Abstract
The cracking characteristics of fiber-reinforced polymer (FRP) strengthened reinforced concrete (RC) beams in both the short- and long-term is addressed in this paper. First, an empirical equation based on regression analysis of test results obtained from 36 beams was derived for the evaluation of crack widths in FRP-strengthened RC beams under short-term loading. The equation accounts for the effective concrete area in tension, steel stress, proximity of tensile longitudinal reinforcement, and primary crack height. Next, the long-term crack widths of glass FRP-strengthened RC beams under sustained loads were studied. Beams strengthened with glass FRP laminates showed improved cracking characteristics with smaller crack widths compared to conventional RC beams. Based on the investigation, two empirical equations are presented to compute the long-term crack widths in FRP-strengthened beams.
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References
American Concrete Institute (ACI). (2001). “Control of cracking in concrete structures.” Manual of concrete practice, 224R-01, Detroit.
American Concrete Institute (ACI). (2002). “Design and construction of externally bonded FRP systems for strengthening concrete structures.” Manual of concrete practice, 440.2R-02, Detroit.
American Concrete Institute (ACI). (2005). “Building code requirements for structural concrete and commentary.” Manual of concrete practice, 318–05, Detroit.
Aw, J. (1998). “Flexural behavior of RC beams externally bonded with fiber reinforced polymer plates.” Bachelor of Engineering dissertation, National Univ. of Singapore, Singapore.
Broms, B. (1965). “Crack width and crack spacing in reinforced concrete members.” ACI J., 62(10), 1237–1256.
CEB-FIP. (1990). CEB-FIP model code 1990, Comite Euro-International Du Beton, London, 246–253.
Gergely, P., and Lutz, L. A. (1968). “Maximum crack width in reinforced concrete flexural members.” Causes, mechanism, and control of cracking in concrete, SP-20, American Concrete Institute, Detroit, 87–117.
Kaar, P. H., and Mattock, A. H. (1963). “High-strength bars as concrete reinforcement. 4: Control of cracking.” J. PCA Res. Dev. Lab., 5(1), 15–38.
Liew, Y. S. (2003). “Durability of fiber reinforced polymer composites under tropical climate.” ME thesis, National Univ. of Singapore, Singapore.
Mathivoli, M. (1999). “Behavior of preloaded RC beams bonded with carbon fiber sheets.” ME thesis, National Univ. of Singapore, Singapore.
Tan, K. H., and Saha, M. K. (2006). “Long-term deflections of rc beams externally bonded with FRP system.” J. Compos. Constr., 10(6), 474–482.
Wang, C. Y., and Ling, F. S. (1998). “Prediction model for the debonding failure of cracked RC beams with externally bonded FRP sheets.” Proc., 2nd Int. Conf. of Composites in Infrastructure (ICCI 98), H. Saadatmanesh and M. R. Ehsani, eds., Department of Civil Engineering and Enigineering Mechanics, Univ. of Arizona, Tucson, Ariz., 548–562.
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© 2008 ASCE.
History
Received: Aug 22, 2007
Accepted: Nov 7, 2007
Published online: Oct 1, 2008
Published in print: Oct 2008
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