Shear Strengthening of RC Beams by Externally Bonded Side CFRP Strips
Publication: Journal of Composites for Construction
Volume 2, Issue 2
Abstract
This paper presents results of an experimental investigation on the response of reinforced concrete beams strengthened in shear using externally applied epoxy-bonded unidirectional carbon-fiber plastic side strips. Three series of 1,300-mm-long reinforced concrete (RC) beams are considered: (1) a series of beams having full strength in shear; (2) a series of beams underreinforced in shear; and a (3) series of beams strengthened in shear. Side strips placed either perpendicularly or diagonally to a beam's longitudinal axis provided the external shear reinforcement. The beams were instrumented and tested under four-point load conditions. Results show the feasibility of using epoxy-bonded strips to restore or increase the load-carrying capacity in shear of RC beams while substantially reducing shear cracking. RC beams strengthened by diagonal side strips outperformed those strengthened with vertical side strips. However, under extreme loading conditions concrete may be torn off at anchorage zone where high concentration of tensile normal stresses is present.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Al-Sulaimani, G. J., Sharif, A., Basunbul, I. A., Baluch, M. H., and Ghaleb, B. N. (1994). “Shear repair for reinforced concrete by fiberglass plate bonding.”ACI Struct. J., (91)3, 458–464.
2.
Arduni, M., Tommaso, A. D., Manfroni, O., and Nanni, A. (1996). “Failure mechanisms of concrete beams reinforced with FRP flexible sheets,”2nd Int. Conf., on Advanced Compos. Mat. in Bridges and Struct. Canadian Soc. of Civ. Eng., Montreal, Canada, M. El-Badry, Ed. 253–260.
3.
Inaba, C. M., Warren, G. E., and Inaba, C. (1995). “Reinforced concrete beams strengthened with CFRP sheets.”Proc., Non-Metallic (FRP) Reinforcements for Concrete Struct., FRPCS-2, 2nd International RiLEM Symposium Proc. L. Taerwe, ed., Ghent, Belgium.
4.
Meier, U., Deuring, M., Meier, H., and Shwegler, G. (1992). “Strengthening of structures with CFRP laminates: research and applications in Switzerland.”Proc., 1st Int. Conf. on Advanced Compos. Mat. in Bridges and Struct., Canadian Soc. of Civ. Eng., Sherbrooke, Quebec, 243–251.
5.
Razaqpur, A. G., and Ali, M. M. (1996). “Ductility and strength of concrete beams externally reinforced with CFRP sheets.”2nd Int. Conf. on Advanced Compos. Mat. in Bridges and Struct., Canadian Soc. of Civ. Eng., Montreal, Canada, M. El-Badry, Ed., 505–512.
6.
Ritchie, P. A., Thomas, D. A., Lu, L. W., and Connelly, G. M.(1991). “External reinforcement of concrete beams using fiberglass reinforced plastics.”ACI Struct. J., 88(4), 490–500.
7.
Saadatmanesh, H., and Ehsani, M. R.(1990). “Fiber composite plates can strengthen beams.”ACI Concrete International, 12(3), 65–71.
8.
Sharif, A., Al-Sulaimani, G. J., Basunbul, I. A., Baluch, M. H., and Ghaleb, B. N. (1994). “Strengthening of initially loaded reinforced concrete beams using FRP plates.”ACI Struct. J., (91)2, 160–168.
9.
Steiner, W. (1996). “Strengthening of structures with CFRP strips.”2nd Int. Conf. on Advanced Compos. Materials in Bridges and Struct., Canadian Soc. of Civ. Eng., Montreal, Canada, M. El-Badry, Ed., 407–418.
Information & Authors
Information
Published In
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: May 1, 1998
Published in print: May 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.