Skip to main content
SpringerLink
Log in

Ultimate stress increase in unbonded tendons in prestressed concrete beams

  • Published:
Journal of Zhejiang University-SCIENCE A Aims and scope Submit manuscript

Abstract

Since the assumption of plane sections cannot be applied to the strain of unbonded tendons in prestressed concrete beams subjected to loadings, a moment-curvature nonlinear analysis method is used to develop analytical programs from stress increases in unbonded tendons at the ultimate limit state. Based on the results of model testing and simulation analysis, equations are proposed to predict the stress increase in tendons at the ultimate state in simple or continuous beams of partially prestressed concrete, considering the loading type, non-prestressed reinforcement index β p, prestressing reinforcement index β s, and span-depth ratio L/h as the basic parameters. Results of 380 beams studied here and test results for 35 simple beams obtained by the China Academy of Building Research were compared with those from prediction equations given in codes and other previous studies. The comparison reveals that the values predicted by the proposed equations agree well with experimental results.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  • A23.3-94. Design of Concrete Structures. Canadian Standards Association. Rexdale, Ontario, Canada.

  • ACI318-02. Building Code Requirements for Structural Concrete (ACI 318-02) and Commentary (ACI 318R-02). American Concrete Institute, Michigan.

  • Ariyawardena, N.D., 2002. Design of precast prestressed concrete members using external prestressing. PCI Journal, 47(2):84–91.

    Article  Google Scholar 

  • Barakat, S., Bani-Hani, K., 2004. Multi-objective reliabilitybased optimization of prestressed concrete beams. Structural Safety, 26(3):311–342. [doi:10.1016/j.strusafe.2003.09.001]

    Article  Google Scholar 

  • BS8110-1-1997. Structural Use of Concrete, Part 1-Code of Practice for Design and Construction. British Standards Institution, London.

  • Chen, X.B., Zhao, G.F., 1993. Investigation and reliability analysis of ultimate strength of unbonded partially prestressed concrete beams. Journal of Dalian University of Technology, 33(5):548–551 (in Chinese).

    Google Scholar 

  • Du, G.C., Tao, X.K., 1985. A study of the ultimate stress of unbonded tendons in partially prestressed concrete beams. Journal of Building Structures, 6(6):2–13 (in Chinese).

    Google Scholar 

  • Harajli, M.H., 1990. Effect of span-depth ratio on the ultimate steel stress in unbonded prestressed concrete member. ACI Structural Journal, 87(8):305–312.

    Google Scholar 

  • JGJ 92-2004. Technical Specification for Concrete Structures Prestressed with Unbonded Tendons. China Academy of Building Research, Beijing.

  • Jin, W.L., Zhao, Y.X., Lü, Z.T., 2000. Ultimate stress of unbounded prestressed tendons. Journal of Zhejiang University (Engineering Science), 34(4):393–397 (in Chinese).

    Google Scholar 

  • Liu, F., Chen, X.B., 2003. Experimental study of unbonded prestressed concrete beams under concentrated load. Journal of Hefei University of Technology, 24(5):880–884 (in Chinese).

    Google Scholar 

  • Naaman, A.E., Alkhairi, F.M., 1991. Stress at ultimate in unbonded prestressing tendons: part 1-evaluation of the state-of-art. ACI Structural Journal, 88(5):683–692.

    Google Scholar 

  • Tao, X.K., 1993. Unbonded Prestressed Concrete Structure Design and Construction. Earthquake Publishing Company, Beijing, China, p.20–50 (in Chinese).

    Google Scholar 

  • Tao, X.K., Wang, Y., Du, G.C., 1989. Deflection estimation for unbonded partially prestressed concrete flexural members. Journal of Building Structures, 10(1):20–27 (in Chinese).

    Google Scholar 

  • Wang, X.D., 2005. Research on Law of Stress Increase in Concrete Flexural Members. MS Thesis, Harbin Institute of Technology, Harbin, China (in Chinese).

    Google Scholar 

  • Xu, J.S., Lin, C.Z., Hong, W.E., 1995. Study on structural behavior of waffle slab floor with unbonded prestressed tendons and non-prestressed steel. Journal of Building Structures, 16(1):3–14 (in Chinese).

    Google Scholar 

  • Zheng, W.Z., Zheng, X., Wang, Y., 2005. Calculation of ultimate stress of unbonded tendons in continuous prestressed concrete beam. Building Structure, 35(7):67–71 (in Chinese).

    Google Scholar 

  • Zhou, W., 2005. Research on Three Fundamental Issues in Design of Prestressed Concrete Structures. PhD Thesis, Harbin Institute of Technology, Harbin, China (in Chinese).

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Department of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, China

    Wen-zhong Zheng & Xiao-dong Wang

Authors
  1. Wen-zhong Zheng
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Xiao-dong Wang
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Xiao-dong Wang.

Additional information

Project supported by the National Natural Science Foundation of China (No. 50178026), the New Century Excellent Talents in University, and Changjiang Scholars Program of China (No. 2009-37)

Rights and permissions

Reprints and permissions

About this article

Cite this article

Zheng, Wz., Wang, Xd. Ultimate stress increase in unbonded tendons in prestressed concrete beams. J. Zhejiang Univ. Sci. A 11, 998–1014 (2010). https://doi.org/10.1631/jzus.A0900618

Download citation

  • Received:

  • Revised:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1631/jzus.A0900618

Key words

CLC number

Search

Navigation