Structural Engineering and Mechanics

  • 제17권1호
  • /
  • Pages.15-27
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  • 2004
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Long-term flexural cracking of reinforced concrete members

  • Al-Zaid, Rajeh Z. (Civil Engineering Department, College of Engineering, King Saud University)
  • 투고 : 2002.12.12
  • 심사 : 2003.10.09
  • 발행 : 2004.01.25
⟨ 이전 논문 다음 논문 ⟩

초록

A rational and simple analytical model to predict the time varying cracking moment of reinforced concrete sections under sustained loading is developed. The modeling procedure is based on equilibrium and compatibility requirements and takes into account the interdependent effects of creep and shrinkage as well as the presence of axial loading. A parametric study is conducted in which particular consideration is given to the effects of reinforcement ratio, level of loading, and creep and shrinkage characteristics of concrete. It is concluded that the reduction in cracking moment is mainly attributed to shrinkage. The effect of shrinkage is more pronounced at low levels of sustained loading and at high reinforcement ratios. This effect is lessened by the compression steel and creep particularly when the applied moment is near the cracking moment.

키워드

참고문헌

  1. ACI Committee 318 (1995), "Building Code Requirements for Structural Concrete (ACI 318-95)", American Concrete Institute, Farmington Hills, Michigan, 351.
  2. ACI Committee 209 (1982), "Prediction of Creep Shrinkage and Temperature Effects in Concrete Structures", American Concrete Institute, Detroit, 108.
  3. AS 3600 (1994), Australian Standard for Concrete Structures, Standards, Australia, Sydney.
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  6. Bazant, Z.P. and Wittmann, F.H. (1982), Creep and Shrinkage in Concrete Structures, John Wiley & Sons, New York.
  7. Gardner, N.J. and Zhao, J.W. (1993), "Creep and shrinkage revisited", ACI Mat. J., 90(3), 236-246.
  8. Ghali, A. (1989), "Prediction of deflection of two-way floor systems", ACI Struct. J., 86(5), 551-562.
  9. Ghali, A. (1993), "Deflection of reinforced concrete members: A critical review", ACI Struct. J., 90(4), 364-373.
  10. Ghali, A. and Favre, R. (1994), Concrete Structures: Stresses and Deformations, E & FN Spon, London, 444.
  11. Gilbert, R.I. (1988), Time Effects in Concrete Structures, Elsevier Sciences Publishing Inc., Amsterdam, 321.
  12. Gilbert, R.I. (1999), "Deflection calculation for reinforced concrete structures-why we sometimes get it wrong", ACI Struct. J., 96(6), 1027-1032.
  13. Rosowsky, D.V., Steward, M.G. and Khor, E.H. (2000), "Early-age loading and long-term deflections of reinforced concrete beams", ACI Struct. J., 97(5), 517-524.

피인용 문헌

  1. Time-dependent stresses and curvatures in cracked R.C. sections under working loads vol.18, pp.3, 2004, https://doi.org/10.12989/sem.2004.18.3.363