Computers and Concrete

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Behaviour of RC Beams with non-bonded flexural reinforcement: A numerical experiment

  • Kotsovou, Gregoria M. (Heriot Watt University) ;
  • Kotsovos, Gerasimos M. (Lithos Consulting)
  • Received : 2016.02.23
  • Accepted : 2016.05.05
  • Published : 2016.08.25
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Abstract

The present work is concerned with a numerical investigation of the behaviour of reinforced-concrete beams with non-bonded flexural tension reinforcement. The numerically-established behaviour of such beams with and without transverse reinforcement is compared with its counterpart of similar beams with bonded reinforcement. From the comparison, it is found that the development of bond anywhere within the shear span inevitably leads to inclined cracking which is the cause of 'shear' failure. On the other hand, the lack of bond within the shear span of the beams is found, not only to prevent cracking within the shear span, but, also, to lead to a flexural type of failure preceded by the formation of horizontal splitting of concrete in the compressive zone. It is also found that delaying the extension of horizontal splitting through the provision of transverse reinforcement in the beam mid span can lead to flexural failure after yielding of the tension reinforcement. Yielding of the tension reinforcement before the horizontal splitting of the compressive zone may also be achieved by reducing the amount of the latter reinforcement.

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References

  1. ADINA (2012), Theory and modeling guide, 1, ADINA, Report ARD-8.
  2. American Concrete Institute (2011), Building code requirements for structural concrete (ACI 318-11) and Commentary (ACI 318R-11).
  3. Bresler, B. and Scordelis, A.C. (1963), "Shear strength of reinforced concrete beams", ACI J., 60(1), 51-74.
  4. Cairns, J. (1995), "Strength in shear of concrete beams with exposed reinforcement", Proceedings of the Institution of Civil Engineers. Structures and buildings, 110(2), 176-185. https://doi.org/10.1680/istbu.1995.27598
  5. Cairns, J. and Zhao, Z. (1993), "Behaviour of concrete beams with exposed reinforcement", Proceedings of the Institution of Civil Engineers: Structures and Bridges, 99(2), 141-154. https://doi.org/10.1680/istbu.1993.23373
  6. Eurocode 2 (EC2) (2004), Design of concrete structures. Part 1-1: General rules and rules of building, British Standards.
  7. Eurocode 8 (EC8) (2004), Design of structures for earthquake resistance. Part 1: General rules, seismic actions and rules for buildings, British Standards.
  8. Iemura, H., Takahashi, Y. and Socabe, N. (2004), "Development of unbonded bar reinforced concrete structure", Proceedings of the 13th World Conference on Earthquake Engineering, Vancouver B.C. Canada, paper No. 1357.
  9. Kani, G.N.J. (1964), "The riddle of shear failure and its solution", ACI J., 61(4), 441-467.
  10. Kim, W. and White, R.N. (1999), "Shear-critical cracking in slender reinforced concrete beams", ACI Struct. J., 96(5), 757-766.
  11. Kong F.K. and Evans R.H. (1987), "Reinforced and prestressed concrete", Van Nostrand Reinhold (UK) Co. Ltd.
  12. Kotsovos, G.M., Vougioukas, E. and Kotsovos, M.D. (2013), "Reducing steel congestion without violating seismic performance requirements", ACI Struct. J., 110(3), 427-435.
  13. Kotsovos, M.D. (2014), Compressive force-path method: Unified ultimate limit-state design of concrete structures, Springer, p. 221.
  14. Kotsovos, M.D. (2015), Finite-element modelling of structural concrete: short-term static and dynamic loading conditions, Taylor and Francis, p. 357
  15. Kotsovos, M.D. and Pavlovic, M.N. (1995), Structural concrete: Finite-element analysis for limit-state design, Thomas Telford (London), p. 550
  16. Kotsovos, M.D. and Pavlovic, M.N. (1999), Ultimate limit-state design of concrete structures: A new approach, Thomas Telford (London), 164 pp.
  17. Kotsovou, G. and Mouzakis, H. (2011), "Seismic behaviour of RC external beam-column joints", Mag. Concrete Res., 63(4), 247-264.
  18. Kotsovou, G. and Mouzakis, H. (2012a), "Seismic design of RC external beam-column joints", Bull. Earthq. Eng., 10(2), 645-677. https://doi.org/10.1007/s10518-011-9303-1
  19. Kotsovou, G. and Mouzakis, H. (2012b), "Exterior RC beam-column joints: New design approach", Eng. Struct., 41, 207-319.
  20. Leonhardt, F. and Walther, R. (1964), "The stuttgart shear tests, 1961, contributions to the treatment of the problems of shear in reinforced concrete construction. (A translation (made by C.V. Amerongen) of the articles that appeared in Beton und Stahlbetonbau", 56(12), and 57(2-3), (7-8), 1962.) Translation No. 111, C&CA, London.
  21. Lorentsen, M. (1965), "Theory for the combined action of bending moment and shear in reinforced and prestressed concrete beams reinforced and prestressed concrete beams", J. Proceedings, 62(4), 403-420.
  22. Pandey, G.R. and Mutsuyoshi, H. (2004), "Seismic damage mitigation of reinforced concrete bridge piers by unbonding longitudinal reinforcements", Proceedings of 13th World Conference on Earthquake Engineering, Vancouver, BC, Canada, paper, 154.
  23. Watstein, D. amd Mathey, R.G. (1958), "Strains in beams having diagonal cracks", J. Proceedings, 55(12), pp. 717-728.
  24. Zielinski, Z.A. and Abdulezer, A. (1977), "Ultimate strength in diagonal splitting of reinforced concrete thin wall panels", Can. J. Civil Eng., 4(2), 226-239. https://doi.org/10.1139/l77-027