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Flexural ductility and deformability of reinforced and prestressed concrete sections

  • Au, Francis T.K. (Department of Civil Engineering, The University of Hong Kong) ;
  • Leung, Cliff C.Y. (Department of Civil Engineering, The University of Hong Kong) ;
  • Kwan, Albert K.H. (Department of Civil Engineering, The University of Hong Kong)
  • 투고 : 2010.01.12
  • 심사 : 2010.09.27
  • 발행 : 2011.08.25

초록

In designing a flexural member for structural safety, both the flexural strength and ductility have to be considered. For this purpose, the flexural ductility of reinforced concrete sections has been studied quite extensively. As there have been relatively few studies on the flexural ductility of prestressed concrete sections, it is not well understood how various structural parameters affect the flexural ductility. In the present study, the full-range flexural responses of reinforced and prestressed concrete sections are analyzed taking into account the nonlinearity and stress-path dependence of constitutive materials. From the numerical results, the effects of steel content, yield strength and degree of prestressing on the yield curvature and ultimate curvature are evaluated. It is found that whilst the concept of flexural ductility in terms of the ductility factor works well for reinforced sections, it can be misleading when applied to prestressed concrete sections. For prestressed concrete sections, the concept of flexural deformability in terms of ultimate curvature times overall depth of section may be more appropriate.

키워드

참고문헌

  1. ACI Committee 318 (2005), Building code requirements for reinforced concrete (ACI 318-05) and commentary (ACI 318-R-05), American Concrete Institute, Farmington Hills, MI.
  2. Ashour, A.F. (2002), "Size of FRP laminates to strengthen reinforced concrete sections in flexure", P. I. Civil Eng. - Str. B., 152(3), 225-233.
  3. Attard, M.M. and Setunge, S. (1996), "The stress strain relationship of confined and unconfined concrete", ACI Mater. J., 93(5), 432-442.
  4. Au, F.T.K., Chan, K.H.E., Kwan, A.K.H. and Du, J.S. (2009), "Flexural ductility of prestressed concrete beams with unbonded tendons", Comput. Concrete, 6(6), 451-472. https://doi.org/10.12989/cac.2009.6.6.451
  5. Bai, Z.Z. (2006), Nonlinear analysis of reinforced concrete beams and columns with special reference to fullrange and cyclic behaviour, PhD Thesis, The University of Hong Kong, Hong Kong.
  6. Bai, Z.Z. and Au, F.T.K. (2009), "Ductility of symmetrically reinforced concrete columns", Mag. Concrete Res., 61(5), 345-357. https://doi.org/10.1680/macr.2008.00149
  7. Bernardo, L.F.A. and Lopes, S.M.R. (2004), "Neutral axis depth versus flexural ductility in high-strength concrete beams", J. Struct. Eng., 130(3), 452-459. https://doi.org/10.1061/(ASCE)0733-9445(2004)130:3(452)
  8. Cohn, M.Z. and Riva, P. (1991), "Flexural ductility of structural concrete sections", PCI J., 36(2), 72-87.
  9. CSA Technical Committee on Reinforced Concrete Design (1994), A23.3-94 Design of concrete structures, Canadian Standards Association, Rexdale, Ontario.
  10. Desayi, P., Iyengar, K.T. and Reddy, K. (1974), "Ductility of reinforced concrete sections with confined compression zones", Earthq. Eng. Struct. Dyn., 4, 111-118.
  11. Du, J.S., Au, F.T.K., Cheung, Y.K. and Kwan, A.K.H. (2008), "Ductility analysis of prestressed concrete beams with unbonded tendons", Eng. Struct., 30, 13-21. https://doi.org/10.1016/j.engstruct.2007.02.015
  12. European Committee for Standardization (2004), Eurocode 2: Design of concrete structures - Part 1-1: General rules and rules for buildings, European Committee for Standardization, Brussels.
  13. Ho, J.C.M., Kwan, A.K.H. and Pam, H.J. (2003), "Theoretical analysis of post-peak flexural behaviour of normal- and high-strength concrete beams", Struct. Des. Tall Spec., 12, 109-125. https://doi.org/10.1002/tal.216
  14. Kwan, A.K.H., Ho, J.C.M. and Pam, H.J. (2002), "Flexural strength and ductility of reinforced concrete beams", P. I. Civil Eng. - Str. B., 152(4), 361-369.
  15. Menegotto, M. and Pinto, P.E. (1973), "Method of analysis for cyclically loaded R.C. plane frames", IABSE preliminary report for symposium on resistance and ultimate deformability of structures acted on by welldefined repeated loads, Lisbon, Portugal, 15-22.
  16. Naaman, AE. (1985), "Partially prestressed concrete: review and recommendations", PCI J., 30(6), 31-71.
  17. Naaman, A.E., Harajli, M.H. and Wight, J.K. (1986), "Analysis of ductility in partially prestressed concrete flexural members", PCI J., 31(3), 64-87. https://doi.org/10.15554/pcij.05011986.64.87
  18. Pam, H.J., Kwan, A.K.H. and Islam, M.S. (2001), "Flexural strength and ductility of reinforced normal- and high-strength concrete beams", P. I. Civil Eng. - Str. B., 146(4), 381-389.
  19. Park, R. and Dai, R. (1988), "Ductility of doubly reinforced concrete beam sections", ACI Struct. J., 85(2), 217-225.
  20. Park, R. and Falconer, T.J. (1983), "Ductility of prestressed concrete piles subjected to simulated seismic loading", PCI J., 28(5), 112-144. https://doi.org/10.15554/pcij.09011983.112.144
  21. Rao, G.A., Vijayanand, I. and Eligehausen, R. (2008), "Studies on ductility and evaluation of minimum flexural reinforcement in RC beams", Mater. Struct., 41, 759-771. https://doi.org/10.1617/s11527-007-9280-7
  22. Thompson, K.J. and Park, R. (1980), "Ductility of prestressed and partially prestressed concrete beam sections", PCI J., 25(2), 46-70. https://doi.org/10.15554/pcij.03011980.46.70
  23. Whitehead, P.A. and Ibell, T.J. (2004), "Deformability and ductility in over-reinforced concrete structures", Mag. Concrete Res., 56(3), 167-177. https://doi.org/10.1680/macr.2004.56.3.167
  24. Zou, P.X.W. (2003), "Flexural behavior and deformability of fiber reinforced polymer prestressed concrete beams", J. Compos. Constr., 7(4), 275-284. https://doi.org/10.1061/(ASCE)1090-0268(2003)7:4(275)

피인용 문헌

  1. Evaluation on Moment-Curvature Relations and Curvature Ductility Factor of Reinforced Concrete Beams with High Strength Materials vol.25, pp.3, 2013, https://doi.org/10.4334/JKCI.2013.25.3.283
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  3. Flexural ductility of reinforced and prestressed concrete sections with corrugated steel webs vol.16, pp.4, 2015, https://doi.org/10.12989/cac.2015.16.4.625
  4. Shear performance assessment of steel fiber reinforced-prestressed concrete members vol.16, pp.6, 2015, https://doi.org/10.12989/cac.2015.16.6.825
  5. Predictions of curvature ductility factor of doubly reinforced concrete beams with high strength materials vol.12, pp.6, 2013, https://doi.org/10.12989/cac.2013.12.6.831
  6. Design procedure for prestressed concrete beams vol.13, pp.2, 2014, https://doi.org/10.12989/cac.2014.13.2.235
  7. Non-linear analysis and moment redistribution of prestressed concrete members vol.166, pp.1, 2013, https://doi.org/10.1680/eacm.11.00021
  8. Automated design of optimum longitudinal reinforcement for flexural and axial loading vol.10, pp.2, 2012, https://doi.org/10.12989/cac.2012.10.2.149
  9. Collapse mechanism and robustness of precast segmental bridges vol.167, pp.4, 2014, https://doi.org/10.1680/bren.11.00045
  10. Improvements in meta-heuristic algorithms for minimum cost design of reinforced concrete rectangular sections under compression and biaxial bending vol.130, 2017, https://doi.org/10.1016/j.engstruct.2016.10.010