Upgrading Continuous Reinforced Concrete Beams by Gluing Steel Plates to Their Tension Faces
Publication: Journal of Structural Engineering
Volume 124, Issue 3
Abstract
It is now fairly common practice to glue steel plates to the tension faces of existing reinforced concrete slabs, as it is an inexpensive and unobtrusive upgrading procedure for strengthening and stiffening. However, the application of this technique to continuous reinforced-concrete beams, as opposed to slabs, is severely restricted by premature debonding of the ends of the tension-face plates through the action of vertical shear forces, that is, shear peeling. An experimental study is presented in which steel plates are glued to the sides of reinforced-concrete beams specifically to inhibit shear peeling of the tension-face plates. The results are incorporated into a design procedure for plating the tension faces of continuous composite beams that can allow for any distribution of applied loads, any variation of the cross-section properties along the length of the beam, and the time effects of creep and shrinkage, as well as propped and unpropped construction. The procedure is then applied to the strengthening and stiffening of a continuous reinforced-concrete beam for strength and serviceability requirements.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Jones, R., Swamy, R. N., and Charif, A.(1988). “Plate separation and anchorage of reinforced concrete beams strengthened by epoxy-bonded steel plates.”The Struct. Engr., London, U.K., 66(5), 85–94.
2.
Luo, W. (1993). “Strengthening of post-tensioned and reinforced concrete beams strengthened by steel plates,” Ms thesis, University of Adelaide, Adelaide, Australia.
3.
MacDonald, M. D. (1982). “The flexural performance of 3.5m concrete beams with various bonded external reinforcements.”Supplementary Rep. 728, Transport and Road Research Laboratory, Crowthorne, U.K.
4.
Oehlers, D. J.(1992). “Reinforced concrete beams with plates glued to their soffits.”J. Struct. Engrg., ASCE, 118(8), 2033–2038.
5.
Oehlers, D. J., and Moran, J. P.(1990). “Premature failure of externally plated reinforced concrete beams.”J. Struct. Engrg., ASCE, 116(4), 978–995.
6.
Sharif, A., Al-Sulaimani, G. J., Basunbul, I. A., Baluch, M. H., and Husain, M.(1995). “Strengthening of shear damaged RC beams by external bonding of steel plates.”Mag. of Concrete Res., 47(173), 329–334.
7.
Swamy, R. N., Jones, R., and Bloxham, J. W. (1987). “Structural behaviour of reinforced concrete beams strengthened by epoxy-bonded steel plates.”The Struct. Engr., London, U.K., 65A(2), 59–68.
8.
Ziraba, Y. N., Baluch, M. H., Basunbul, I. A., Sharif, A. M., Azad, A. K., and Al-Sulaimani, G. J.(1994). “Guidelines toward the design of reinforced concrete beams with external plates.”ACI Struct. J., 91(6), 639–646.
9.
Zsutty, T. C. (1968). “Beam shear strength prediction by analysis of existing data.”J. ACI, 65(Nov.), 943–951.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 124 • Issue 3 • March 1998
Pages: 224 - 232
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: Mar 1, 1998
Published in print: Mar 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.