Structural Engineering and Mechanics

  • 제19권2호
  • /
  • Pages.185-198
  • /
  • 2005
  • /
  • 1225-4568(pISSN)
  • /
  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Effects of strain hardening of steel reinforcement on flexural strength and ductility of concrete beams

  • Ho, J.C.M. (Department of Civil Engineering, The University of Hong Kong) ;
  • Au, F.T.K. (Department of Civil Engineering, The University of Hong Kong) ;
  • Kwan, A.K.H. (Department of Civil Engineering, The University of Hong Kong)
  • 투고 : 2002.06.17
  • 심사 : 2004.09.21
  • 발행 : 2005.01.30
⟨ 이전 논문 다음 논문 ⟩

초록

In the design of reinforced concrete beams, it is a standard practice to use the yield stress of the steel reinforcement for the evaluation of the flexural strength. However, because of strain hardening, the tensile strength of the steel reinforcement is often substantially higher than the yield stress. Thus, it is a common belief that the actual flexural strength should be higher than the theoretical flexural strength evaluated with strain hardening ignored. The possible increase in flexural strength due to strain hardening is a two-edge sword. In some cases, it may be treated as strength reserve contributing to extra safety. In other cases, it could lead to greater shear demand causing brittle shear failure of the beam or unexpected greater capacity of the beam causing violation of the strong column-weak beam design philosophy. Strain hardening may also have certain effect on the flexural ductility. In this paper, the effects of strain hardening on the post-peak flexural behaviour, particularly the flexural strength and ductility, of reinforced normal- and high-strength concrete beams are studied. The results reveal that the effects of strain hardening could be quite significant when the tension steel ratio is relatively small.

키워드

참고문헌

  1. Attard, M.M. and Setunge, S. (1996), 'The stress strain relationship of confined and unconfined concrete', ACI Mater. J, 93(5), 432-444
  2. British Standards Institution, BS 4449 (1988), Specification for Hot Rolled Steel Bars for the Reinforcement of Concrete, London, UK, 11pp
  3. Ho, J.C.M., Kwan, A.K.H. and Pam, H.J. (2003), 'Theoretical analysis of post-peak flexural behaviour of nonnal- and high-strength concrete beams', Structural Design of Tall and Special Buildings, 12(2), 109-125 https://doi.org/10.1002/tal.216
  4. Kwan, A.K.H., Ho, J.C.M. and Pam, H.J (2004), 'Effects of concrete grade and steel yield strength on flexural ductility of reinforced concrete beams', Australian J. Struct. Eng., 5(2), 119-138
  5. Mander, J.B., Priestley, M.J.N. and Park, R. (1984), 'Seismic design of bridge piers', Research Report 84-2, Department of Civil Engineering, University of Canterbury, Christchurch, New Zealand
  6. Pam, H.J., Kwan, A.K.H. and Ho, J.C.M. (2001), 'Post-peak behavior and flexural ductility of doubly reinforced normal-and high-strength concrete beams', Struct. Eng. Mech., 12(5),459-474 https://doi.org/10.12989/sem.2001.12.5.459
  7. Park, R. and Paulay, T. (1975), Reinforced Concrete Structures, John Wiley & Sons, New York, USA, 769pp

피인용 문헌

  1. Confining and hoop stresses in ring-confined thin-walled concrete-filled steel tube columns vol.68, pp.18, 2016, https://doi.org/10.1680/jmacr.15.00225
  2. Improving flexural ductility of high-strength concrete beams vol.159, pp.6, 2006, https://doi.org/10.1680/stbu.2006.159.6.339
  3. Behaviour of uni-axially loaded concrete-filled-steel-tube columns confined by external rings vol.23, pp.6, 2014, https://doi.org/10.1002/tal.1046
  4. Behaviour of uni-axially loaded CFST columns confined by tie bars vol.83, 2013, https://doi.org/10.1016/j.jcsr.2012.12.014
  5. Effect of small axial force on flexural ductility design of high-strength concrete beams vol.24, pp.11, 2015, https://doi.org/10.1002/tal.1209
  6. Flexural ductility design of high-strength concrete columns vol.22, pp.1, 2013, https://doi.org/10.1002/tal.662
  7. Effects of strain hardening of reinforcement on flexural strength and ductility of reinforced concrete columns vol.20, pp.7, 2011, https://doi.org/10.1002/tal.554
  8. Deformability design of high-performance concrete beams vol.22, pp.9, 2013, https://doi.org/10.1002/tal.728
  9. Flexural ductility design of high-strength concrete beams vol.22, pp.6, 2013, https://doi.org/10.1002/tal.714
  10. Limited ductility design of reinforced concrete columns for tall buildings in low to moderate seismicity regions vol.20, pp.1, 2011, https://doi.org/10.1002/tal.610
  11. Maximum axial load level and minimum confinement for limited ductility design of high-strength concrete columns vol.6, pp.5, 2005, https://doi.org/10.12989/cac.2009.6.5.357
  12. Comparison between ACI 318-05 and Eurocode 2 (EC2-94) in flexural concrete design vol.32, pp.6, 2009, https://doi.org/10.12989/sem.2009.32.6.705
  13. Normalised rotation capacity for deformability evaluation of high-performance concrete beams vol.1, pp.3, 2005, https://doi.org/10.12989/eas.2010.1.3.269
  14. Concurrent flexural strength and deformability design of high-performance concrete beams vol.40, pp.4, 2005, https://doi.org/10.12989/sem.2011.40.4.541
  15. Effect of confinement on flexural ductility design of concrete beams vol.20, pp.2, 2005, https://doi.org/10.12989/cac.2017.20.2.129