Structural Behavior of Composite RC Beams with Externally Bonded CFRP
Publication: Journal of Composites for Construction
Volume 2, Issue 3
Abstract
The overall objective of this paper is to establish the structural behavior of reinforced concrete (RC) beams strengthened with externally bonded carbon-fiber-reinforced plastic (CFRP) sheets. Four beams, three with bonded CFRP plates on the tension face, and two of which were provided with carefully designed external anchorages at the ends of the plates and along the span, were tested under four-point bending over a span of 4.8 m. The tests were carried out under displacement control. The beams were extensively instrumented to monitor strains, deflection, and curvature over the entire spectrum of loading to total failure, and to determine the structural response to load of the composite beams. The results show that bonding a CFRP plate on the tension face of a RC beam, without consideration of the end-anchorage stresses and the bond slip between the plate and the concrete substrate, can lead to significant degradation in the structural response of the plated beam. Carefully designed external anchorages, on the other hand, can lead to preservation of composite action to almost the failure load, increases in load capacity of up to 70%, substantial regain of structural ductility, and the transformation of a brittle failure to a more ductile failure.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Bencardino, F., Spadea, G., and Swamy, R. N. (1996). “Use of non-metallic reinforcements for strengthening/rehabilitating new and deteriorating structures.”Proc., Int. Conf. on Mat. Engrg., XXV AIAS Nat. Conf., Gallipoli, Lecce, L'Editrice Salentina, Lecce, 1185–1192.
2.
Jones, R., Swamy, R. N., and Charif, A.(1988). “Plate separation and anchorage of reinforced concrete beams strengthened by epoxy-bonded steel plates.”Struct. Engr., 66(5), 85–94.
3.
Meier, U.(1995). “Strengthening of structures using carbon fiber/epoxy composites.”Contr. and Build. Mat., 9(6), 341–351.
4.
Meier, U., and Deuring, M.(1991). “The application of fiber composites in bridge repair.”Strasse und Verkehr, 77(9), 775–777.
5.
Meier, U., Deuring, M., Meier, H., and Schuregler, G. (1992). “Strengthening of structures with CFRP laminates: research and applications in Switzerland.”Proc., 1st Int. Conf. on Advanced Composite Mat. in Bridges and Struct., The Canadian Soc. for Civ. Engrg., Montreal, Canada, 243–251.
6.
Meier, U., and Kaiser, H. (1991). “Strengthening of structures with CFRP laminates.”Proc., Adv. Comp. Mat. in Civ. Engrg. Struct., American Society of Civil Engineers, New York, 224–232.
7.
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.
8.
Steiner, W. (1996). “Strengthening structures with CFRP strips.”Proc. 2nd Int. Conf. on Advanced Mat. in Bridges and Struct., The Canadian Soc. for Civ. Engrg., Montreal, Canada, 407–417.
9.
Swamy, R. N. (1996). “Adhesive bonding in construction technology.”Advanced technology for design and fabrication of composite materials and structures., Kluwer, Dordrecht, The Netherlands, 15–30.
10.
Swamy R. N., Lynsdale, C. J., and Mukhopadhyaya, P. (1996). “Effective strengthening with ductility: Use of externally bonded plates made of non-metallic composite materials.”Proc., 2nd Int. Conf. on Advanced Composite Mat. in Bridges and Struct., The Canadian Soc. for Civ. Engrg., Montreal, Canada, 481–488.
11.
Swamy, R. N., and Mukhopadhyaya, P. (1995). “Role and effectiveness of non-metallic plates in strengthening and upgrading concrete structures.”Proc., 2nd Int. RILEM Symp. FRPRCS-2, Ghent, E & FN Spon, London, 473–482.
12.
Triantafillou, T. C., and Plevris, N.(1992). “Strengthening of RC beams with epoxy-bonded fiber-composite materials,”Mat. and Struct., Paris, France, 25, 201–211.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 2 • Issue 3 • August 1998
Pages: 132 - 137
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: Aug 1, 1998
Published in print: Aug 1998
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.