Journal of the Architectural Institute of Korea Structure & Construction (대한건축학회논문집:구조계)

Architectural Institute of Korea (대한건축학회)
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Minimum Shear Reinforcement Ratio of Prestressed Concrete Beams Considering Reserved Shear Strength

강도여유율을 고려한 프리스트레스트 콘크리트 보의 최소전단철근비

  • Received : 2017.01.11
  • Accepted : 2017.05.02
  • Published : 2017.05.30
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Abstract

The minimum amounts of shear reinforcement for reinforced concrete and prestressed concrete members are specified in code provisions to prevent brittle shear failure, most of which are empirically formulated. In KCI-12, the minimum shear reinforcement ratio for prestressed concrete members is lower than that for reinforced concrete members, which may cause unsafe shear design in some cases. In this study, therefore, shear tests of prestressed concrete members were performed with a key variable of shear reinforcement ratio. Also, shear test results on the prestressed concrete beams that were lightly reinforced in shear were collected from previous studies, which were then used for evaluating the minimum amounts of shear reinforcement specified in KCI-12, considering their reserved shear strength. The analysis results showed that the minimum shear reinforcement requirements for prestressed concrete members specified in KCI-12 are un-conservative in many cases, and thus, this study proposed the minimum shear reinforcement ratio for prestressed concrete members that can ensure a desirable reserved shear strength.

Keywords

Acknowledgement

Supported by : 한국연재단

References

  1. ACI Committee 318 (2014). Building Code Requirements for Structural Concrete and Commentary (ACI 318M-14). American Concrete Institute, Farmington Hills, Michigan.
  2. American Association of State Highway and Transportation Officials. (2007). AASHTO LRFD Bridge Design Specifications, 4thed., AASHTO, Washington D.C.
  3. Avendano, A. R., & Bayrak, O. (2011). Efficient Shear Reinforcement Design Limits for Prestressed Concrete Beams, ACI Structural Journal, 108(6), 689-697.
  4. Bennett, E. W., & Debaiky, S. Y. (1974). High Strength Steel as Shear Reinforcement in Prestressed Concrete Beams, ACI Special publication, 42, 231-249.
  5. Collins, M. P., & Mitchell, D. (1991). Prestressed Concrete Structures, Prentice Hill, 766.
  6. Durrani, A. J., & Robertson, I. N. (1987). Shear Strength of Prestressed Concrete T-Beams with Welded Wire Fabric as Shear Reinforcement, PCI Journal, 32(2), 46-61.
  7. Elzanaty, A. H., Nilson, A. H., & Slate, F. O. (1986). Shear Capacity of Prestressed Concrete Beams Using High-Strength Concrete Beams Using High-Strength Concrete, ACI Journal, Proceedings, 83(3), 359-368.
  8. Frosch, R. J. (2000). Behavior of Large-scale Reinforced Concrete Beams with Minimum Shear Reinforcement, ACI Structure Journal, 97(6), 814-820.
  9. Ghosh, S. K. (1986). Exceptions of Precast Prestressed Concrete Members to Minimum Reinforcement Requirements, PCI Journal, 31(6), 74-91. https://doi.org/10.15554/pcij.11011986.74.91
  10. Hernandez, G. (1958). Strength of Prestressed Concrete Beams With Web Reinforcement. Bulletin No. 153, Engineering Experiment Station, University of Illinois, Urbana, IL, 135.
  11. Johnson, M. K., & Ramirez, J. A. (1989). Minimum Shear Reinforcement in Beams with Higher Strength Concrete, ACI Structural Journal, 86(4), 376-382.
  12. Kaufman, M. K., & Ramirez, J. A. (1988). Re-Evaluation of the Ultimate Shear Behavior of High-Strength Concrete Prestressed I-Beams, ACI Structural Journal, 85(3), 295-303.
  13. Kim, K. S., Lee, D. H., & Ju, H. J. (2011). Minimum and Maximum Shear Reinforcement Ratio of Reinforced Concrete Members, Architectural Institute of Korea, 27(2), 63-72.
  14. Korea Concrete Institute (2012). Design Specifications for Concrete Structures, Kimoondang.
  15. Kuchma, D. A., & Kim, K. S. (2001). Stress Limits and Minimum Reinforcement Requirements in Shear Design Provisions, Progress in Structural Engineering and Materials, 3(4), 317-325.
  16. Kuchma, D. A., Kim, K. S., & Hawkins, N. M. (2005). NCHRP Project 12-61, Simplified Shear Design of Structural Concrete Members. Journal of the Transportation Research Board, CD 11-S, 129-142.
  17. Kuchma, D., Hawkins, N. M., Kim, S., Sun, S. & Kim, K. S. (2008). Simplified Shear Provisions of the AASHTO LRFD Bridge Design Specifications, PCI Journal, 38(3), 53-73.
  18. Laskar, A., Hsu, T. T. C. & Mo, Y. L. (2010). Shear Strengths of Prestressed Concrete Beams Part 1: Experiments and Shear Design Equations, ACI Structural Journal, 107(3), 330-339.
  19. Lee, J. Y., & Yoon, S. H. (2003). Evaluation of the Minimum Shear Reinforcement Ratio of Reinforced Concrete Members, Journal of Korea Concrete Institute, 16(1), 43-53.
  20. MacGregor, J. G. (1958). Effect of Draped Reinforcement on Behavior of Prestressed Concrete Beams. Bulletin No. 154, Engineering Experiment Station, University of Illinois, Urbana, IL, 83.
  21. MacGregor, J. G. (1960). Strength and Behavior of Prestressed Concrete Beams with Web Reinforcement, Ph.D thesis, Department of Civil Engineering, University of Illinois at Urbana-Champaign, 295.
  22. Mattock, A. H., & Kaar, P. H. (1961). Precast-Prestressed Concrete Bridges 4. Shear Tests of Continuous Girders, Journal of the PCA Research and Development Laboratories, 3(1), 17-52.
  23. Moayer, M., & Regan, P. E. (1974). Shear Strength of Prestressed and Reinforced Concrete T-Beams, ACI Special publication, 42, 183-213.
  24. Olesen, S. E., Sozen, M. A., & Siess, C. P. (1965). Investigation of Prestressed Reinforced Concrete for Highway Bridges Part IV: Strength in Shear of Beams with Web Reinforcement, Bulletin No. 295, Engineering Experiment Station, University of Illinois, Urbana, IL, 152.
  25. Ozcebe, G., Ersoy, U., & Tankut, T. (1999). Evaluation of Minimum Shear Reinforcement Requirements for Higher Strength Concrete, ACI Structural Journal, 96(3), 361-369.
  26. Park, M. K., Lee, D. H., Ju, H., Hwang, J. H. Choi, S. H. & Kim, K. S. (2015). Minimum Shear Reinforcement Ratio of Prestressed Concrete Members for Safe Design, Structural Engineering and Mechanics, 56(2), 317-340. https://doi.org/10.12989/sem.2015.56.2.317
  27. Reineck, K. H., Kuchma, D. A., Kim, K. S., & Marx, S. (2003). Shear Database for Reinforced Concrete Members without Shear Reinforcement, ACI Structural Journal, 100(2), 240-249.
  28. Teoh, B. K., Mansur, M. A., & Wee, T. H. (2002). Behavior of High-Strength Concrete I-Beams with Low Shear Reinforcement, ACI Structural Journal, 99(3), 299-307.
  29. Yoon, Y. S., Cook, W. D., & Mitchell, D. (1996). Minimum and High-Strength Concrete Beams, ACI Structural Journal, 93(5), 576-584.