Structural Engineering and Mechanics

  • 제55권6호
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  • Pages.1099-1120
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  • 2015
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
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Behaviour of continuous prestressed concrete beams with external tendons

  • Chan, K.H. Enoch (CH2M HILL) ;
  • Au, Francis T.K. (Department of Civil Engineering, The University of Hong Kong)
  • 투고 : 2014.10.14
  • 심사 : 2015.08.30
  • 발행 : 2015.09.25
⟨ 이전 논문 다음 논문 ⟩

초록

External prestressing has been applied to both new construction and retrofitting of existing reinforced and prestressed concrete structures. Continuous beams are preferred to simply supported beams because of economy, fewer movement joints and possible benefits from moment redistribution. However, this paper argues that continuous prestressed concrete beams with external unbonded tendons demonstrate different full-range behaviour compared to reinforced concrete (RC) beams. Applying the same design approach for RC to external prestressing may lead to design with a lower safety margin. To better understand the behaviour of continuous prestressed concrete beams with unbonded tendons, an experimental investigation is performed in which nine such specimens are tested to failure. The full-range behaviour is investigated with reference to moment-curvature relationship and moment redistribution. The amounts of moment redistribution measured in the experiments are compared with those allowed by BS 8110, EC2 and ACI 318. Design equations are also proposed to estimate the curvature ductility index of unbonded prestressed concrete beams.

키워드

과제정보

연구 과제 주관 기관 : Research Grants Council (RGC)

참고문헌

  1. ACI Committee 318 (2011), Building Code Requirements for Structural Concrete (ACI 318-11) and Commentary (ACI 318R-11), American Concrete Institute, Farmington Hills, MI, USA.
  2. Alkhairi, F.M. and Naaman, A.E. (1993), "Analysis of beams prestressed with unbonded internal or external tendons", ASCE J. Struct. Eng., 119(9), 2680-2700. https://doi.org/10.1061/(ASCE)0733-9445(1993)119:9(2680)
  3. Allouche, E.N., Campbell, T.I., Green, M.F. and Soudki, K.A. (1998), "Tendon stress in continuous unbonded prestressed concrete members-Part 1: review of literature", PCI J., 43(6), 86-93. https://doi.org/10.15554/pcij.11011998.86.93
  4. Allouche, E.N., Campbell, T.I., Green, M.F. and Soudki, K.A. (1999), "Tendon stress in continuous unbonded prestressed concrete members-Part 2: parametric study". PCI J., 44(1), 60-71.
  5. Aravinthan, T., Mutsuyoshi, H., Fujioka, A. and Hishiki, Y. (1996), "Flexural behavior of two span continuous segmental PC beams with external tendons", Tran. JPN Concrete Inst., 18, 229-234.
  6. Aravinthan, T., Mutsuyoshi, H., Matupayont, S. and Machida, A. (1995), "Moment redistribution in prestressed concrete continuous beams with external tendons", Tran. JPN Concrete Inst., 17, 197-202.
  7. Aravinthan, T., Witchukreangkrai, E. and Mutsuyoshi, H. (2005), "Flexural behavior of two-span continuous prestressed concrete girders with highly eccentric external tendons", ACI Struct. J., 102(3), 402-411.
  8. 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
  9. Au, F.T.K. and Du, J.S. (2004), "Prediction of ultimate stress in unbonded prestressed tendons", Mag. Concrete Res., 56(1), 1-11. https://doi.org/10.1680/macr.2004.56.1.1
  10. Au, F.T.K., Su, R.K.L., Tso, K. and Chan, K.H.E. (2008), "Behaviour of partially prestressed beams with external tendons", Mag. Concrete Res., 60(6), 455-467. https://doi.org/10.1680/macr.2008.60.6.455
  11. Bondy, K.B. (2003), "Moment redistribution: principles and practice using ACI 318-02", PTI J., 1(1), 3-21.
  12. British Standards Institution (1997), BS 8110: Part 1: Structural Use of Concrete: Code of Practice for Design and Construction, BSI, London, UK.
  13. European Committee for Standardisation (2004), Eurocode 2: Design of Concrete Structures-Part 1-1: General Rules and Rules for Buildings, European Committee for Standardisation, Brussels, Belgium.
  14. Harajli, M.H., Khairallah, N. and Nassif, H. (1999), "Externally prestressed members: evaluation of second-order effects", ASCE J. Struct. Eng., 125(10), 1151-1161. https://doi.org/10.1061/(ASCE)0733-9445(1999)125:10(1151)
  15. Harajli, M.H., Mabsout, M.E. and Al-hajj, J.A. (2002), "Response of externally post-tensioned continuous members", ACI Struct. J., 99(5), 671-680.
  16. Jaiswal, O. (2008), "Effect of prestressing on the first flexural natural frequency of beams", Struct. Eng. Mech., 28(5), 515-524. https://doi.org/10.12989/sem.2008.28.5.515
  17. Du, J.S., Au, F.T.K., Cheung, Y.K. and Kwan, A.K.H. (2008), "Ductility analysis of prestressed concrete beams with unbounded tendons", Eng. Struct., 30(1), 13-21. https://doi.org/10.1016/j.engstruct.2007.02.015
  18. Lou, T., Lopes, S.M.R. and Lopes, A.V. (2013), "Nolinear and time-dependent analysis of continuous unbonded pretressed concrete beams", Comput. Struct., 119, 166-176. https://doi.org/10.1016/j.compstruc.2012.12.014
  19. Lou, T. and Xiang, Y. (2010), "Numerical analysis of second-order effects of externally prestressed concrete beams", Struct. Eng. Mech., 35(5), 631-643. https://doi.org/10.12989/sem.2010.35.5.631
  20. Naaman, A.E. and Alkhairi, F.M. (1991), "Stress at unbonded post-tensioned tendons: Part 1-evaluation of the state-of-the-art", ACI Struct. J., 88(5), 641-651.
  21. Park, R. and Paulay, T. (1975), Reinforced Concrete Structures, John Wiley & Sons, New York, NY, USA.
  22. Pisani, M.A. (1996), "A numerical model for externally prestressed beams", Struct. Eng. Mech., 4(2), 177-190. https://doi.org/10.12989/sem.1996.4.2.177
  23. Scott, R.H. and Whittle, RT. (2005), "Moment redistribution effects in beams", Mag. Concrete Res., 57(1), 9-20. https://doi.org/10.1680/macr.2005.57.1.9
  24. Virlogeux, M. (1988), "Nonlinear analysis of externally prestressed structures", FIP Symposium Proceedings, Jerusalem, Israel,.
  25. Wu, X.H. and Lu, X.L. (2003), "Tendon model for nonlinear analysis of externally prestressed concrete structures", ASCE J. Struct. Eng., 129(1), 96-104. https://doi.org/10.1061/(ASCE)0733-9445(2003)129:1(96)
  26. Wyche, P.J., Uren, J.G. and Reynolds, G.C. (1992), "Interaction between prestress secondary moments, moment redistribution, and ductility-a treatise on the Australian concrete codes", ACI Struct. J., 89(1), 57-70.

피인용 문헌

  1. Effect of linear transformation on nonlinear behavior of continuous prestressed beams with external FRP cables vol.147, 2017, https://doi.org/10.1016/j.engstruct.2017.06.029
  2. Moment redistribution in two-span prestressed NSC and HSC beams vol.50, pp.6, 2017, https://doi.org/10.1617/s11527-017-1116-5
  3. Moment Redistribution in EPC Continuous Curved Box Beams vol.22, pp.8, 2017, https://doi.org/10.1061/(ASCE)BE.1943-5592.0001055
  4. Behavior of Strengthened Composite Prestressed Concrete Girders under Static and Repeated Loading vol.2017, 2017, https://doi.org/10.1155/2017/3619545
  5. Moment Redistribution in Continuous Externally CFRP Prestressed Beams with Steel and FRP Rebars vol.13, pp.8, 2021, https://doi.org/10.3390/polym13081181