Structural Engineering and Mechanics

  • 제9권5호
  • /
  • Pages.505-518
  • /
  • 2000
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Retrofitting by adhesive bonding steel plates to the sides of R.C. beams. Part 2: Debonding of plates due to shear and design rules

  • Oehlers, Deric. J. (Department of Civil and Environmental Engineering, University of Adelaide) ;
  • Nguyen, Ninh T. (Department of Civil and Environmental Engineering, University of Adelaide) ;
  • Bradford, Mark A. (School of Civil Engineering, University of New South Wales)
  • 발행 : 2000.05.25
⟨ 이전 논문 다음 논문 ⟩

초록

A major cause of premature debonding of tension face plates is shear peeling (Jones et al. 1988, Swamy et al. 1989, Ziraba et al. 1994, Zhang et al. 1995), that is debonding at the plate ends that is associated with the formation of shear diagonal cracks that are caused by the action of vertical shear forces. It is shown in this paper how side plated beams are less prone to shear peeling than tension face plated beams, as the side plate automatically increases the resistance of the reinforced concrete beam to shear peeling. Tests are used to determine the increase in the shear peeling resistance that the side plates provide, and also the effect of vertical shear forces on the pure flexural peeling strength that was determined in the companion paper. Design rules are then developed to prevent premature debonding of the plate ends due to peeling and they are applied to the strengthening and stiffening of continuous reinforced concrete beams. It is shown how these design rules for side plated beams can be adapted to allow for propped and unpropped construction and the time effects of creep and shrinkage, and how side plates can be used in conjunction with tension face plates.

키워드

참고문헌

  1. Jones, R, Swamy, RN. and Charif, A. (1988), "Plate separation and anchoragte of reinforced concrete beams strengthened by epoxy-bonded steel plates", The Structural Engineer, 66(5), 85-94.
  2. Nguyen, N.T and Oehlers, D.J. (1997a), "Experimental investigation of side-plated beams subjected to both flexural peeling and shear peeling", Dept. of Civil and Environmental Engng., University of Adelaide, Research Report R 142, April.
  3. Nguyen, N.T and Oehlers, D.J. (1997b). "Interaction curves for flexural and shear peeling of side-plated glued beams", Dept. of Civil and Environmental Engng., University of Adelaide, Research Report R 152, April.
  4. Oehlers, D.J. (1992), "Reinforced concrete beams with plates glued to their soffits", Journal of Structural Engineering, ASCE, 118(8), Aug. 2023-2038 https://doi.org/10.1061/(ASCE)0733-9445(1992)118:8(2023)
  5. Oehlers, D.J. (1995), "Rules for bonding steel plates to existing reinforced concrete slabs", Australian Civil Engineering Transactions, CE37(1), Feb.,15-20.
  6. Oehlers, D.J. and Moran, J.P. (1990), "Premature failure of externally plated reinforced concrete beams", Journal of Structural Engineering, ASCE, 116(4), 978-995, April. https://doi.org/10.1061/(ASCE)0733-9445(1990)116:4(978)
  7. Oehlers, D.J., Nguyen, N.T. and Bradford, M.A. (2000), "Retrofitting by adhesive bonding steel plates to the sides of R.C. beams. Part 1: Debonding of plates due to flexure", Structural Engineering and Mechanics, An Int'l Journal, 9(5), 491-504. https://doi.org/10.12989/sem.2000.9.5.491
  8. Oehlers, D.J., Mohamed Ali, M.S. and Lou, W. (1998b), "Upgrading continuous reinforced concrete beams by gluing steel plates to their tension faces", Journal of Structural Engineering, ASCE, Mar., 124(3).
  9. Swamy, R.N., Jones, R. and Charif, A. (1989), "The effect of external plate reinforcement on the strengthening of structurally damaged RC beams", The Structural Engineer, 67(3), 45-56.
  10. Zhang, S., Raoof, M. and Wood, L.A. (1995), "Prediction of peeling failure of reinforced concrete beams with externally bonded steel plates", Proc. Institution of Civil Engineers, Structures and Buildings, 110(aug), 257-268.
  11. Ziraba, Y.N., Baluch, M.H. and Basunbul,I.A. et al. (1994), "Guidelines toward the design of reinforced concrete beams with external plates", ACI Structural Journal, 91(6), 639-646.

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