KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
권호 표지
DOI QR코드

DOI QR Code

Effective Strengths of Concrete Struts in Strut-Tie Models of Reinforced Concrete Deep Beams

철근콘크리트 깊은 보 스트럿-타이 모델의 콘크리트 스트럿의 유효강도

  • 채현수 (경북대학교 건축토목공학부) ;
  • 윤영묵 (경북대학교 건축토목공학부)
  • Received : 2012.09.28
  • Accepted : 2013.08.09
  • Published : 2013.11.30
Download PDF
⟨ Previous Next ⟩

Abstract

The effective strength of concrete struts must be determined accurately for the reliable strut-tie model analysis and design of structural concrete. In this study, the equations of the effective strength, which are useful for the three types of determinate and indeterminate strut-tie models of reinforced concrete deep beams employed in current design codes, are proposed. The effects of shear span-to-effective depth ratio, compressive strength of concrete, and flexural and shear reinforcement ratios are reflected in the development of the proposed equations. To examine the appropriateness of the proposed equations, the strengths of 241 reinforced concrete deep beams, all tested to shear failure, are evaluated by using the three types of strut-tie models with the existing and proposed equations.

스트럿-타이 모델 방법을 이용하여 철근콘크리트 깊은 보를 정확하게 해석하고 안전하게 설계하기 위해서는 콘크리트 스트럿의 유효강도를 정확하게 결정하여야 한다. 이 연구에서는 여러 설계기준서 및 연구문헌에서 제안된 세 종류의 대표적인 철근콘크리트 깊은 보의 스트럿-타이 모델을 위하여 철근콘크리트 깊은 보의 전단경간 비, 콘크리트의 압축강도, 그리고 휨철근 및 전단철근 비 등의 주요 설계변수들의 영향을 정확하게 반영할 수 있는 콘크리트 스트럿의 유효강도 식을 개발, 제안하였다. 현행 설계기준서 및 여러 연구문헌의 콘크리트 스트럿의 유효강도 식과 이 연구에서 제안한 유효강도 식을 이용하여 파괴실험이 수행된 241개 철근콘크리트 깊은 보의 극한강도를 평가하였으며, 그 결과의 비교분석을 통해 이 연구에서 제안한 스트럿 유효강도 식의 적합성을 평가하였다.

Keywords

References

  1. ACI Subcommittee 445 (2002). Examples for the design of structural concrete with strut-and-tie models, Special Publication SP-208, American Concrete Institute, Farmington Hills, Michigan, USA.
  2. American Association of State Highway and Transportation Officials (2007). AASHTO LRFD bridge design specifications, 4th Edition, Washington D.C., USA.
  3. American Association of State Highway and Transportation Officials (2010). AASHTO LRFD bridge design specifications, 5th Edition, Washington D.C., USA.
  4. American Concrete Institute (2008). Building code requirements for structural concrete (ACI 318M-08) and commentary, Farmington Hills, Michigan, USA.
  5. American Concrete Institute (2011). Building code requirements for structural concrete (ACI 318M-11) and commentary, Farmington Hills, Michigan, USA.
  6. Bergmeister, K., Breen, J. E. and Jirsa, J. O. (1991). Dimensioning of the nodes and development of reinforcement, Structural Concrete, IABSE Colloquium, Stuttgart, Report, International Association for Bridge and Structural Engineering, Zurich, pp. 551-556.
  7. Bergmeister, K., Breen, J. E., Jirsa, J. O. and Kreger, M. E. (1993). Detailing in structural concrete, Research Report 1127-3F, Center for Transportation Research, University of Texas at Austin, Texas, USA.
  8. Canadian Standards Association (2004). Design of concrete structures for buildings, CSA A23.3-M04, Rexdale, Ontario, Canada.
  9. Chae, H. S. (2012). Indeterminate strut-tie models for reinforced concrete deep beams and corbels, Ph.D Dissertation, Kyungpook National University, Daegu, Korea, p. 290 (in Korean).
  10. Comite Euro-International du Beton (2010). CEP-FIP model code 2010, International Federation for Structural Concrete (fib), Lausanne, Switzerland.
  11. Foster, S. J. and Gilbert, R. I. (1998). "Experimental studies on high-strength concrete deep beams." ACI Structural Journal, Vol. 95, No. 4, pp. 382-390.
  12. Jeun, C. H. and Yun, Y. M. (2010). "Validity evaluation of effective strength of concrete strut using strut-tie model analysis of structural concrete." Journal of the Korean Society of Civil Engineers, Vol. 30, No. 5A, pp. 443-462 (in Korean).
  13. Kim, B. H. and Yun, Y. M. (2011). "An indeterminate strut-tie model and load distribution ratio for RC deep beams - (1) Model & Load distribution ratio." Advances in Structural Engineering, Vol. 14, No. 6, pp. 1031-1041. https://doi.org/10.1260/1369-4332.14.6.1031
  14. Kim, S. C. and Park, S. Y. (2005). "A study on shear steel effect on RC deep beams." Journal of the Korean Society of Civil Engineers, Vol. 25, No. 2, pp. 365-374 (in Korean).
  15. MacGregor, J. G. (1997). Reinforced concrete - mechanics and design, 3rd Edition, Prentice Hall, Englewood Cliffs, New Jersey, USA.
  16. Marti, P. (1985). "Basic tools of reinforced concrete beam design." Journal of American Concrete Institute, Vol. 82, No. 1, pp. 46-56.
  17. Nielsen, M. P., Braestrup, M. W., Jensen, B. C. and Bach, F. (1978). Concrete plasticity, beam shear - Shear in joints - Punching shear, Special Publication, Danish Society for Structural Science and Engineering, Lyngby, Denmark.
  18. Oh, J. K. and Shin, S. W. (2001). "Shear strength of reinforced high-strength concrete deep beams." ACI Structural Journal, Vol. 98, No. 2, pp. 164-173.
  19. Schlaich, J., Schaefer, K. and Jennewein, M. (1987). "Towards a consistent design of structural concrete." Journal of the Prestressed Concrete Institute, Vol. 32, No. 3, pp. 74-151.
  20. Shin, S. W., Lee, K. S., Moon, J. I. and Ghosh, S. K. (1999). "Shear strength of reinforced high-strength concrete beams with shear span-to-depth ratios between 1.5 and 2.5." ACI Structural Journal, Vol. 96, No. 4, pp. 549-556.
  21. Smith, K. M. and Vantsiotis, A. S. (1982). "Shear strength of deep beams." ACI Material Journal, Vol. 79, No. 3, pp. 201-213.
  22. Tan, K. H. and Lu, H. Y. (1999). "Shear behavior of large reinforced concrete deep beams and code comparisons." ACI Structural Journal, Vol. 96, No. 5, pp. 836-845.
  23. Tan, K. H., Kong, F. K., Teng, S. and Guan, L. (1995). "Highstrength concrete deep beams with effective span and shear span variations." ACI Structural Journal, Vol. 92, No. 4, pp. 572-582.
  24. Tan, K. H., Kong, F. K., Teng, S. and Weng, L. W. (1997a). "Effect of web reinforcement on high-strength concrete deep beams." ACI Structural Journal, Vol. 94, No. 6, pp. 572-582.
  25. Tan, K. H., Teng, S., Kong, F. K. and Lu, H. Y. (1997b). "Main tension steel in high strength concrete deep and short beams." ACI Structural Journal, Vol. 94, No. 5, pp. 752-768.
  26. Teng, S., Kong, F. K., Poh, S. P., Guan, L. W. and Tan, K. H. (1996). "Performance of strengthened concrete deep beams predamaged in shear." ACI Structural Journal, Vol. 93, No. 2, pp. 159-171.
  27. Thulimann, B. (1976). Shear strength of reinforced and prestressed concrete - CEB approach, Special Publication 59-6, American Concrete Institute, Detroit, USA.
  28. Yun, Y. M. (2005). "Effective strength of concrete strut in strut-tie model (I): Methods for determining effective strength of concrete strut." Journal of the Korean Society of Civil Engineers, Vol. 25, No. 1, pp. 49-59 (in Korean).