Structural Engineering and Mechanics

  • 제73권2호
  • /
  • Pages.143-152
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  • 2020
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Shear mechanism of steel fiber reinforced concrete deep coupling beams

  • Li, Kou (School of Mechanics and Engineering Science, Zhengzhou University) ;
  • Zhao, Jun (School of Mechanics and Engineering Science, Zhengzhou University) ;
  • Ren, Wenbo (School of Civil Engineering, Zhengzhou University)
  • 투고 : 2018.11.12
  • 심사 : 2019.08.27
  • 발행 : 2020.01.25
⟨ 이전 논문 다음 논문 ⟩

초록

Deep coupling beams are more prone to suffer brittle shear failure. The addition of steel fibers to seismic members such as coupling beams can improve their shear performance and ductility. Based on the test results of steel fiber reinforced concrete(SFRC) coupling beams with span-to-depth ratio between 1.5 and 2.5 under lateral reverse cyclic load, the shear mechanism were analyzed by using strut-and-tie model theory, and the effects of the span-to-depth ratio, compressive strength and volume fraction of steel fiber on shear strengths were also discussed. A simplified calculation method to predict the shear capacity of SFRC deep coupling beams was proposed. The results show that the shear force is mainly transmitted by a strut-and-tie mechanism composed of three types of inclined concrete struts, vertical reinforcement ties and nodes. The influence of span-to-depth ratio on shear capacity is mainly due to the change of inclination angle of main inclined struts. The increasing of concrete compressive strength or volume fraction of steel fiber can improve the shear capacity of SFRC deep coupling beams mainly by enhancing the bearing capacity of compressive struts or tensile strength of the vertical tie. The proposed calculation method is verified using experimental data, and comparative results show that the prediction values agree well with the test ones.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China, University of Minister of Education of China

참고문헌

  1. ACI 318 (2014), Building code requirements for structural concrete and commentary, American Concrete Institute; Farmington Hills, MI, USA.
  2. Bhunia, D., Parkash, V. and Pandey, A.D. (2007), "A procedure for the evaluation of coupling beam characteristics of coupled shear wall", Asian J. Civil Eng., 8(3), 301-314.
  3. Cai, G.C., Zhao, J., Degee, H. and Vandoren, B. (2016), "Shear capacity of steel fibre reinforced concrete coupling beams using conventional reinforcements", Eng. Struct., 128, 428-440. https://doi.org/10.1016/j.engstruct.2016.09.056.
  4. Canbolat, B.A., Parra-Montesinos, G.J. and Wight, J.K. (2005), "Experimental study on seismic behavior of high-performance fiber-reinforced cement composite coupling beams", ACI Struct. J., 102(1), 159-166.
  5. Chaailal, O., Thibodeau, S., Lescelleur, J. and Maleenfant, P. (1996), "Steel fiber or conventional reinforcement for concrete shear walls?", Concrete International, 18(6), 39-42.
  6. CSA Committee A23.3 (2004), Design of concrete structures, Canadian Standard Association; Mississauga, Canada.
  7. Deng, M., Ma, F., Ye, W. and Liang, X. (2018), "Investigation of the shear strength of HDC deep beams based on a modified direct strut-and-tie model", Constr. Build. Mater., 172, 340-348. https://doi.org/10.1016/j.conbuildmat.2018.03.274.
  8. Gao, D.Y., Shi, K. and Zhao, S.B. (2014), "Calculation method for shear capacity of steel fiber reinforced concrete beam-column joints based on softened strut-and-tie model", China Civil Eng. J., 47(9), 101-109. https://doi.org/10.15951/j.tmgcxb.2016.02.005.
  9. Hanoon, A.N., Jaafar, M.S., Hejazi, F. and Aziz, F.N.A. (2017), "Strut-and-tie model for externally bonded CFRP-strengthened reinforced concrete deep beams based on particle swarm optimization algorithm: CFRP debonding and rupture", Constr. Build Mater., 147, 428-447. https://doi.org/10.1016/j.conbuildmat.2017.04.094.
  10. Hwang, S.J. and Lee, H.J. (2002), "Strength prediction for discontinuity regions by softened strut-and-tie model", J. Struct. Eng., 128(12), 1519-1526. https://doi.org/10.1061/(ASCE)0733-9445(2002)128:12(1519).
  11. Hwang, S.J., Lu, W.Y. and Lee, H.J. (2000), "Shear strength prediction for deep beams", ACI Struct. J., 97(3), 367-376.
  12. Jia, B. (2012), "Experimental study on steel fiber reinforced concrete coupling beams with different concrete strength", M.Sc. Dissertation, Zhengzhou University, Zhengzhou.
  13. Kuang, J.S. and Baczkowski, B.J. (2006). "Shear capacity of steel fibre reinforced concrete coupling beams", Joint International Conference on Computing and Decision Making in Civil and Building Engineering, Montreal, Canada, June.
  14. Kuang, J.S. and Baczkowski, B.J. (2009), "Steel-fibre-reinforced concrete coupling beams subjected to monotonic loading", Magazine Concrete Res., 61(1), 35-41. https://doi.org/10.1680/macr.2008.00019.
  15. Kuo, W.W., Cheng, T.J. and Hwang, S.J. (2010), "Force transfer mechanism and shear strength of reinforced concrete beams", Eng. Struct., 32(6), 1537-1546. https://doi.org/10.1016/j.engstruct.2010.02.002.
  16. Kwan, A.K.H. and Zhao, Z.Z. (2002), "Cyclic behaviour of deep reinforced concrete coupling beams", Proc ICE Structures & Building, 152(3), 283-293. https://doi.org/10.1680/stbu.2002.152.3.283.
  17. Lee, H.J., Kuchma, D.A., Baker, W. and Novak, L. (2008), "Design and analysis of heavily loaded reinforced concrete link beams for Burj Dubai", ACI Struct. J., 105(4), 451-459.
  18. Lequesne, R.D., Parra-Montesinos, G.J. and Wight, J.K. (2013), "Behavior and design of high-performance fiber-reinforced concrete coupling beams and coupled-wall systems", J. Struct. Eng., 139(8), 1362-1370. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000687.
  19. Li, B. (2012), "Experimental study on steel fiber reinforced concrete coupling beams with different span-depth ratio", M.Sc. Dissertation, Zhengzhou University, Zhengzhou.
  20. Ma X. (2011), "Experimental study on steel fiber reinforced concrete coupling beams with different volume fraction of steel fibers", M.Sc. Dissertation, Zhengzhou University, Zhengzhou.
  21. Matamoros, A.B., Wong, K.H. (2003), "Design of simply supported deep beams using strut-and-tie models", ACI Struct. J., 100(6), 704-712.
  22. Mihaylov, B.I. and Franssen, R. (2017), "Shear-flexure interaction in the critical sections of short coupling beams", Eng. Struct., 152, 370-380. https://doi.org/10.1016/j.engstruct.2017.09.024.
  23. Naaman, A.E. (1991), "Bond-slip mechanisms of steel fibers in concrete", ACI Mater. J., 88(2), 135-145.
  24. Ng, T., Htut, T. and Foster, S.J. (2012), "Fracture of steel fibre reinforced concrete-the unified variable engagement model", M.Sc. Dissertation, The University of New South Wales, Sydney.
  25. NZS 3101 (2006), Concrete structures standard, Part 1 - the design of concrete structures, Standards Association of New Zealand; Wellington, New Zealand.
  26. Parra-Montesinos, G.J. (2005), "High-performance fiber-reinforced cement composites: an alternative for seismic design of structures", ACI Struct. J., 102(5), 668-675.
  27. Pauletta, M., Luca, D.D. and Russo, G. (2015), "Exterior beam column joints -Shear strength model and design formula", Eng. Struct., 94, 70-81. https://doi.org/10.1016/j.engstruct.2015.03.040.
  28. Romualdi, J.P. and Mandel, J.A. (1964), "Tensile strength of concrete affected by uniformly distributed and closely spaced short lengths of wire reinforcement", ACI Mater. J., 61(6), 657-672.
  29. Schlaich, J., Schafer, K. and Jennewein, M. (1987), "Toward a consistent design of structural concrete", PCI J., 32(3), 74-150. https://doi.org/10.15554/pcij.05011987.74.150
  30. Thomas, T.C.H, Mo, Y.L. (2010), Unified Theory of Concrete Structures, Wiley Press, Chichester, United Kingdom.
  31. Yavuz, G. (2016), "Shear strength estimation of RC deep beams using the ANN and strut-and-tie approaches", Struct. Eng. Mech., 57(4), 657-680. https://doi.org/10.12989/sem.2016.57.4.657.
  32. Zhang, H.Z., Zhang, R.J. and Huang, C.K. (2007), "Experimental study of shear resistance of steel fiber reinforced high strength concrete coupling beams". China Civ. Eng. J., 40(11), 15-22. https://doi.org/10.15951/j.tmgcxb.2007.11.005