Computers and Concrete

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Strut-tie model evaluation of behavior and strength of pre-tensioned concrete deep beams

  • Yun, Young Mook (Department of Civil Engineering, Kyungpook National University)
  • Received : 2004.06.19
  • Accepted : 2005.08.10
  • Published : 2005.08.25
⟨ Previous Next ⟩

Abstract

To date, many studies have been conducted for the analysis and design of reinforced concrete members with disturbed regions. However, prestressed concrete deep beams have not been the subject of many investigations. This paper presents an evaluation of the behavior and strength of three pre-tensioned concrete deep beams failed by shear and bond slip of prestressing strands using a nonlinear strut-tie model approach. In this approach, effective prestressing forces represented by equivalent external loads are gradually introduced along strand's transfer length in the nearest strut-tie model joints, the friction at the interface of main diagonal shear cracks is modeled by the aggregate interlock struts along the direction of the cracks in strut-tie model, and an algorithm considering the effect of bond slip of prestressing strands in the strut-tie model analysis and design of pre-tensioned concrete members is implemented. Through the strut-tie model analysis of pre-tensioned concrete deep beams, the nonlinear strut-tie model approach proved to present effective solutions for predicting the essential aspects of the behavior and strength of pre-tensioned concrete deep beams. The nonlinear strut-tie model approach is capable of predicting the strength and failure modes of pre-tensioned concrete deep beams including the anchorage failure of prestressing strands and, accordingly, can be employed in the practical and precise design of pre-tensioned concrete deep beams.

Keywords

References

  1. Alshegeir, A. and Ramirez, J. A. (1992), "Strut-tie approach in pretensioned deep beams", ACI Struct. J., 89(3), 296-304.
  2. American Association of State Highway Transportation Officials (1998), AASHTO LRFD BRIDGE DESIGN SPECIFICATIONS, SI Units, 2nd Edition, Washington D.C.
  3. American Concrete Institute (2002), Building Code Requirements for Structural Concrete (ACI 318-02) and Commentary (318R-02), American Concrete Institute, Farmington Hills, Michigan.
  4. Chen, B. S., Hagenberger, M. J. and Breen, J. E. (2002), "Evaluation of strut-and-tie modeling applied to dapped beam with opening", ACI Struct. J., 99(4), 445-450.
  5. Foster, S. J., Powell, R. E. and Selim, H. S. (1996), "Performance of high-strength concrete corbels", ACI Struct. J., 93(5), 555-563.
  6. Foster, S. J. and Malik, A. R. (2002), "Evaluation of efficiency factor models used in strut-and-tie modeling of nonflexural members", J. Struct. Eng., ASCE, 128(5), 569-577. https://doi.org/10.1061/(ASCE)0733-9445(2002)128:5(569)
  7. Kaufman, M. K. (1989), The Ultimate Strength and Behavior of High Strength Concrete Prestressed Composite I-Beams, Ph.D Thesis, School of Civil Engineering, Purdue University, Indiana, 228.
  8. MacGregor, J. G. (1997), Reinforced Concrete - Mechanics and Design, 3rd Edition, Prentice-Hall, New Jersey, 939.
  9. Maxwell, B. S. and Breen, J. E. (2000), "Experimental evaluation of strut-and-tie model applied to deep beam with opening", ACI Struct. J., 97(1), 142-148.
  10. Ramirez, J. A. and Breen, J. E. (1983), Proposed Design Procedures for Shear and Torsion in Reinforced and Prestressed Concrete, Research Report No. 248-4F, Center for Transportation Research, The University of Texas at Austin, Austin, Texas, 254.
  11. Sanders, D. H. and Breen, J. E. (1997), "Post-tensioned anchorage zones with single straight concentric anchorages", ACI Struct. J., 94(2), 146-158.
  12. Schlaich, J., Schaefer, K. and Jennewein, M. (1987), "Towards a consistent design of structural concrete", Journal of the Prestressed Concrete Institute, 32, 74-150.
  13. Siao, W. B. (1993), "Strut-and-tie model for shear behavior in deep beams and pile caps failing in diagonal splitting", ACI Struct. J., 90(4), 356-363.
  14. Siao, W. B. (1994), "Shear strength of short reinforced concrete walls, corbels, and deep beams". ACI Struct. J., 91(2), 123-133.
  15. Tan, K. H., Tong, K. and Tang, C. Y. (2001), "Direct strut-and-tie model for prestressed deep beams", J. Struct. Eng., ASCE, 127(9), 1076-1084. https://doi.org/10.1061/(ASCE)0733-9445(2001)127:9(1076)
  16. Vecchio, F. J. and Collins, M. P. (1986), "The modified compression field theory for reinforced concrete elements subjected to shear", ACI J., 83(2), 219-231.
  17. Yun, Y. M. (2000), "Nonlinear strut-tie model approach for structural concrete", ACI Struct. J., 97(4), 581-590.
  18. Yun, Y. M. (2000), "Computer graphics for nonlinear strut-tie model approach", J. Comput. in Civ. Eng., ASCE, 14(2), 127-133. https://doi.org/10.1061/(ASCE)0887-3801(2000)14:2(127)
  19. Yun, Y. M. and Ramirez, J. A. (1996), "Strength of struts and nodes in strut-tie model", J. Struct. Eng., ASCE, 122(1), 20-29. https://doi.org/10.1061/(ASCE)0733-9445(1996)122:1(20)
  20. Yun, Y. M. (2005), "Evaluation of ultimate strength of post-tensioned anchorage zones", J. Advanced Concrete Technology, JCI, 3(1), 149-160. https://doi.org/10.3151/jact.3.149

Cited by

  1. A method for effective beam widths of slabs in flat plate structures under gravity and lateral loads vol.21, pp.4, 2005, https://doi.org/10.12989/sem.2005.21.4.451
  2. Identification of a suitable ANN architecture in predicting strain in tie section of concrete deep beams vol.46, pp.6, 2013, https://doi.org/10.12989/sem.2013.46.6.853
  3. A time discretization scheme based on integrated radial basis functions for heat transfer and fluid flow problems vol.74, pp.2, 2018, https://doi.org/10.1080/10407790.2018.1515329
  4. Application of artificial neural networks (ANNs) and linear regressions (LR) to predict the deflection of concrete deep beams vol.11, pp.3, 2013, https://doi.org/10.12989/cac.2013.11.3.237
  5. 콘크리트 구조부재의 2차원 스트럿-타이 모델 설계를 위한 컴퓨터 그래픽 프로그램 vol.37, pp.3, 2005, https://doi.org/10.12652/ksce.2017.37.3.0531