International Journal of Concrete Structures and Materials

Korea Concrete Institute (한국콘크리트학회)
권호 표지
DOI QR코드

DOI QR Code

An Experimental Study on Interrelation of Influential Parameters on Unbonded Tendon Stress

  • Moon, Jeong-Ho (Dept. of Architectural Engineering, Hannam University) ;
  • Lim, Jae-Hyung (Dept. of Architectural Engineering, Woosong Technical College)
  • Published : 2006.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

The purpose of this study is to investigate the relations between unbonded tendon stress and its influential parameters, i.e. bonded reinforcement ratio, span/depth ratio, and loading type. To this end, the influence of such parameters was examined with twenty eight test results of previous studies. Afterwards, an experimental study was carried out with twenty one test specimens. The investigation of previous and current experiments revealed the followings; (1) The bonded reinforcement ratio and prestressing ratio were proved to be important variables on the unbonded tendon stress. (2) The ratio of span to depth and the type of loading affected the unbonded tendon stress partially although their effects varied with bonded reinforcement ratio. (3) AASHTO LRFD Code and Moon/Lim's design equations predicted the experimental results well with the safety margin.

Keywords

References

  1. Naaman, A. E. and Alkhairin, F. M., 'Stress at Ultimate in Unbonded Post-Tensioning Tendons. Part II: Proposed Methodology,' ACI Strnctural Journal, Vol.88,No.6, 1991, pp.683~692
  2. Allouche, E. N., Campbell, T. I., Green, M. F., and Soudki, K. A., 'Tendon Stress in Continuous Unbonded Prestressed Concrete Members-Part 2 : Parametric Study,' PCI Journal, Vol.44,No.1, 1999, pp.60~73
  3. ACI Committee 318, 'Building Code Requirements for Structural Concrete (ACI 318-99) and Commentary (ACI 318R-99),' American Concrete Institute, Farmington Hills, MI, 1999, 365pp
  4. Lim, J. H., Moon, J. H., and Lee, L. H., “An Experimental Study on Impoπant Variables Influencing the Stress of Unbonded Tendons,' Journal of Korea Concrete Institute, Vol.11,No.1, 1999, pp.209~219. (in Korean)
  5. Lee, J. Y, Lim, J. H., Moon, J. H., and Shin, K. J., 'Overestimation of the Stress of Tendons in a Pre-stressed Concrete Beam with Unbonded Tendons,' Journal of Korea Concrete Institute, Vol.11, No.4, 1999, pp.73~81. (in Korean)
  6. Lee, L. H., Moon, J. H., and Lim, J. H., 'Proposed Methodology for the Computation of Unbonded Tendon Stress at Flexural Failure,' ACI Structural Journal, Vol.96, No.6, 1999, pp.1040~1048
  7. Harajli, M. H. and Kanj, M. Y, 'Ultimate Flexural Strength of Concrete Members Prestressed with Unbonded Tendons,' ACI Structural Journal, Vol.88,No.6, 1991, pp.663~673
  8. AASHTO, AASHTO LRFD Bridge Design Specification, SI unit $1^{st}$ Ed. American Association of State Highway and Transportation Officials, 1994