Flexural Strengthening of Reinforced Concrete Flanged Beams with Composite Laminates
Publication: Journal of Composites for Construction
Volume 6, Issue 2
Abstract
Bonding composite laminates to the tension face can effectively increase the flexural strength of the reinforced-concrete flanged beams. In comparison to rectangular concrete beams, the flange provides a larger area of concrete to resist compression stresses, and considering the role of the composite in resisting tensile stresses, its addition to flanged beams can efficiently upgrade the flexural capacity. Failure of the strengthened beam may result from crushing of concrete or rupture of the plate; however, the beam must be properly detailed to avoid local shear failure at the plate cut-off point. In this paper, equations required for strengthening of the flanged beams for gravity loads will be presented. The equations have been developed based on load and resistance factor design, and have been verified through a comparison with available experimental results. Close agreement with the experimental results indicates the accuracy of the equations. Terms, definitions, and notations compatible to ordinary reinforced-concrete design codes have been used to facilitate the application of the equations.
Get full access to this article
View all available purchase options and get full access to this article.
References
An, W., Saadatmanesh, H., and Ehsani, M. R.(1991). “RC beams strengthened with FRP plates. II: Analysis and parametric study.” J. Struct. Eng., 117(11), 3434–3455.
Jones, R. M. (1999). Mechanics of composite materials, McGraw-Hill, New York.
Kupfer, H. B., and Gerstle, K. H.(1973). “Behavior of concrete under biaxial stresses.” J. Eng. Mech. Div., 99(4), 853–866.
Malek, A. M., and Saadatmanesh, H. (1996). “Physical and mechanical properties of typical fibers and resins.” Proc., 1st Int. Conf. on Composites in Infrastructure, H. Saadatmanesh and M. R. Ehsani, eds., Tuscon, Ariz., 68–79.
Malek, A. M., Saadatmanesh, H., and Ehsani, M. R.(1998). “Prediction of failure load of R/C beams strengthened with FRP plate due to stress concentration at the plate end.” ACI Struct. J., 95(2), 142–152.
Nanni, A., Focacci, F., and Cobb, C. A. (1998). “Proposed procedure for the design of RC flexural members strengthened with FRP sheets.” Proc., 2nd Int. Conf. on Composites in Infrastructure, H. Saadatmanesh and M. R. Ehsani, eds., Tuscon, Ariz., 187–201.
Nilson, A. H., and Winter, G. (1997). Design of concrete structures, 11th Ed., McGraw-Hill, New York.
Ritchie, P. A., Thomas, D. A., Lu, L.-W., and Connelly, G. M.(1991). “External reinforcement of concrete beams using fiber reinforced plastics.” ACI Struct. J., 88(4), 490–500.
Saadatmanesh, H., and Ehsani, M. R.(1991). “RC beams strengthened with GFRP plates. I: Experimental study.” J. Struct. Eng., 117(11), 3417–3433.
Saadatmanesh, H., and Malek, A. M.(1998). “Design guidelines for flexural strengthening of RC beams with FRP plates.” J. Compos. Constr., 2(4), 158–164.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 6 • Issue 2 • May 2002
Pages: 97 - 103
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Oct 18, 1999
Accepted: Oct 11, 2001
Published online: Apr 15, 2002
Published in print: May 2002
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.