TECHNICAL PAPERS
May 1, 2000

Retrofitting of Deficient RC Cantilever Slabs Using GFRP Strips

Publication: Journal of Composites for Construction
Volume 4, Issue 2

Abstract

Despite many studies on beams and slabs strengthened using fiber-reinforced plastic (FRP) plates, no study has been reported on the strengthening of RC cantilever slabs (e.g., canopies and balconies) using FRP materials. This paper presents the results of an experimental study of the feasibility of strengthening deficient RC cantilever slabs by bonding glass FRP (GFRP) strips/sheets on the top surface (the tension side). As the key to the success of this strengthening method is a proper way of anchoring the GFRP strips into the supporting wall and the slab, the effectiveness of different anchorage systems was the focus of the experiments. Based on the test results, a simple and effective method is identified in which the GFRP strips are anchored into the walls through horizontal slots and onto the slab using fiber anchors.

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References

1.
Chajes, M. J., Thomson, T. A., Jr. Januszka, T. F., and Finch, W. W., Jr. (1994). “Flexural strengthening of concrete beams using externally bonded composite materials.” Constr. and Build. Mat., 8(3), 191– 201.
2.
Malek, 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.
3.
Meier, U., and Winistorfer, A. ( 1995). “Retrofitting of structures through external bonding of CFRP sheets.” Non-metallic (FRP) reinforcement for concrete structures, L. Taerwe, ed., E & FN Spon, London, 465–472.
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Sharif, A., Al-Sulaimani, G. J., Basunbul, I. A., Baluch, M. B., and Ghaleb, B. N. (1994). “Strengthening of initially load reinforced concrete beams using FRP plates.” ACI Struct. J., 91, 160.
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Spadea, G., Bencardino, F., and Swamy, R. N. (1998). “Structural behaviour of composite beams with externally bonded CFRP.”J. Compos. for Constr., ASCE, 2(3), 132–137.
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Information & Authors

Information

Published In

Go to Journal of Composites for Construction
Journal of Composites for Construction
Volume 4Issue 2May 2000
Pages: 75 - 84

History

Received: Dec 29, 1998
Published online: May 1, 2000
Published in print: May 2000

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Authors

Affiliations

Prof., Dept. of Civ. and Struct. Engrg., Hong Kong Polytechnic Univ., Hunghom, Kowloon, Hong Kong, China.
Postdoctoral Fellow, Dept. of Civ. and Struct. Engrg., Hong Kong Polytechnic Univ., Hunghom, Kowloon, Hong Kong, China.
Asst. Engr., China State Constr. Engrg. Corp., Hong Kong, China.
Deputy General Mgr., L & M Specialist Construction Ltd., Hong Kong, China.

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