Static and Fatigue Behavior of Reinforced Concrete Beams Strengthened with Steel Plates for Flexure
Publication: Journal of Structural Engineering
Volume 129, Issue 4
Abstract
The strengthening of existing concrete structures is a major concern in recent years as the number of degraded structures increases. The purpose of this paper is to investigate the static and fatigue behavior of reinforced concrete (RC) beams strengthened with steel plates. Toward this end, a comprehensive test program has been set up and many series of strengthened beams have been tested. The major test variables include the plate thickness, adhesive thickness, and the shear-span-to-depth ratio. The test results indicate that the separation of plates is the dominant failure mechanism even for the full-span-length strengthened beams with steel plates. The actual measured load capacities for strengthened beams are found to be smaller than the theoretical ultimate load capacities which are based on the full composite action of a concrete beam and steel plate. The strengthened beams exhibit more dominant shear cracking as the shear-span-to-depth ratio decreases. The ultimate capacity of strengthened beams increases slightly with the increase of adhesive thickness, which may be caused by the late initiation of plate separation in the beams with thicker adhesive. The present study also indicates that the strengthened beams exhibit much higher fatigue resistance than the unstrengthened beams at the same fatigue load level. The increase of deflections of strengthened beams according to the number of load cycles is much smaller than that of unstrengthened beams. The present study provides very useful results for the realistic application of the plate-strengthening method in RC structures.
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References
American Concrete Institute. (ACI). (1995). “Building code requirements for structural concrete and commentary.” ACI 318-99, Farmington Hills, Mich.
ASTM C39. (2002). American Society of Testing and Material.
Cho, J. Y. (2001). “Behavior and analysis of RC beams strengthened with externally bonded plates for flexure and shear.” PhD thesis, Seoul National Univ., Seoul, Korea.
Hamoush, S. A., and Ahmad, S. H.(1990a). “Debonding of steel-plate strengthened concrete beams.” J. Struct. Eng., 116(2), 356–371.
Hamoush, S. A., and Ahmad, S. H.(1990b). “Static strength tests of steel strengthened concrete beams.” Mater. Struct., 23, 116–125.
Hussain, M., Sharif, A., Basunbul, I. A., and Baluch, M. H.(1995). “Flexural behavior of precracked reinforced concrete beams strengthened externally by steel plates.” ACI Struct. J., 92(1), 14–22.
Jones, R., Swamy, R. N., and Charif, A.(1988). “Plate separation and anchorage of reinforced concrete beams strengthened by epoxy-bonded steel plates.” Struct. Eng., 66(5), 85–94.
Oehlers, D. J., and Moran, J. P.(1990). “Premature failure of externally plated reinforced concrete beams.” J. Struct. Eng., 116(4), 978–995.
Oehlers, D. J.(1992). “Reinforced concrete beams with plates glued to their soffits.” J. Struct. Eng., 118(8), 2023–2038.
Oehlers, D. J., Ali, M. S. M., and Luo, W.(1998). “Upgrading continuous reinforced concrete beams by gluing steel plates to their tension faces.” J. Struct. Eng., 124(3), 224–232.
Oh, B. H., Cho, J. Y., and Kang, D. O.(1997). “Structural behavior of RC beams strengthened with steel.” J. Korea Concrete Inst., Seoul, 9(5), 233–244, (in Korean).
Oh, B. H., Cho, J. Y., and Park, D. G. (2003). "Failure behavior and separation criterion for strengthened concrete members with steel plates." J. Struct. Eng., in press.
Park, R., and Paulay, T. (1975). Reinforced concrete structures, Wiley, New York.
Roberts, T. M., and Haji, K. H.(1989). “Theoretical study of the behaviour of reinforced concrete beams strengthened by externally bonded steel plates.” Proc. Inst. Civ. Eng., Struct. Build., 87, 39–55.
Swamy, R. N., Jones, R., and Bloxham, J. W.(1987). “Structural behaviour of reinforced concrete beams strengthened by epoxy-bonded steel plates.” Struct. Eng., 65A(2), 59–68.
Swamy, R. N., Jones, R., and Charif, A.(1989). “The effect of external plate reinforcement on the strengthening of structurally damaged RC beams.” Struct. Eng., 67(3), 45–54.
Zhang, S., and Wood, L. A.(1995). “Prediction of peeling failure of reinforced concrete beams with externally bonded steel plates.” Proc. Inst. Civ. Eng., Struct. Build., 110, 257–268.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 129 • Issue 4 • April 2003
Pages: 527 - 535
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Mar 19, 2001
Accepted: May 30, 2002
Published online: Mar 14, 2003
Published in print: Apr 2003
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