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Nominal flexural strength of high-strength concrete beams

  • Received : 2018.05.01
  • Accepted : 2018.12.15
  • Published : 2019.02.25

Abstract

The conventional ACI rectangular stress block is developed on the basis of normal-strength concrete column tests and it is still being used for the design of high-strength concrete members. Many research papers found in the literature indicate that the nominal strength of high-strength concrete members appears to be over-predicted by the ACI rectangular stress block. This is especially true for HSC columns. The general shape of the stress-strain curve of high-strength concrete becomes more likely as a triangle. A triangular stress block is, therefore, introduced in this paper. The proposed stress block is verified using a database which consists of 52 tested singly reinforced high-strength concrete beams having concrete strength above 55 MPa (8,000 psi). In addition, the proposed model is compared with models of various design codes and proposals of researchers found in the literature. The nominal flexural strengths computed using the proposed stress block are in a good agreement with the tested data as well as with that obtained from design codes models and proposals of researchers.

Keywords

References

  1. ACI-ASCE Committee 441 (2018), Report on Equivalent Rectangular Concrete Stress Block and Transverse Reinforcement for High-Strength Concrete Columns (ACI 441.1R-18), American Concrete Institute, Farmington Hills, MI, USA.
  2. ACI Committee 318 (2014), Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary (318R-14), American Concrete Institute, Farmington Hills, MI, USA.
  3. Ashour, S.A. (2000), "Effect of compressive strength and tensile reinforcement ratio on flexural behavior of high-strength concrete beams", Eng. Struct., 22, 413-423. https://doi.org/10.1016/S0141-0296(98)00135-7
  4. Azizinamini, A., Kuska, S.S.B., Brungardt, P. and Hatfield, E. (1994), "Seismic behavior of square high-strength concrete columns", ACI Struct. J., 91(3), 336-345.
  5. Bae, S. and Bayrak, O. (2003), "Stress block parameters for high-strength concrete members", ACI Struct. J., 100(5), 626-636.
  6. Bae, S. and Bayrak, O. (2013), "Examination of stress block parameters for high-strength concrete in the context of ACI 318 Code", Am. Concrete Inst., Special Publication, 293, 1-20.
  7. Bernardo, L.F.A. and Lopes, S.M.R. (2004), "Neutral axis depth versus flexural ductility in high-strength concrete beams", ASCE J. Struct. Eng., 130(3), 425-459.
  8. Brachmann, G. and Empelmann, M. (2018), "Design compressive strength values of concrete under sustained loads", Eds. Hordijk, D. and Lukovic, M., High Tech Concrete: Where Technology and Engineering Meet, Springer, Cham, Switzerland.
  9. CEB-FIP Model Code (2010), Comite Euro-International du Beton, Thomas Telford.
  10. Collins, M.P., Mitchell, D. and MacGregor, J.G. (1993), "Structural design considerations for high-strength concrete", Concrete Int., 15(5), 27-34.
  11. CSA A23.3-04 (2004), Design of Concrete Structures, Canadian Standards Association, Rexdale, Mississauga, ON, Canada.
  12. Danica, G. (2016), "Coefficient ${\alpha}cc$ in design value of concrete compressive strength", J. Facul. Civil Eng., 30, 41-51.
  13. EN 1992-1-1 (2004), Design of Concrete Structures-Part 1-1: General Rules and Rules for Buildings, European Committee for Standardization; Brussels, Belgium.
  14. Hognestad, E., Hanson, N.W. and McHenry, D. (1955), "Concrete stress distribution in ultimate strength design", ACI J., Proc., 52(4), 455-479.
  15. Ibrahim, H.H.H. (1994), "Flexural behavior of high-strength concrete columns", Ph.D. Dissertation, University of Alberta, Edmonton, AB, Canada.
  16. Ibrahim, H.H.H. and MacGregor, J.G. (1997), "Modification of the ACI rectangular stress block for high-strength concrete", ACI Struct. J., 94(1), 40-48.
  17. Jang, I.Y., Park, H.G., Kim, S.S., Kim, J.H. and Kim, Y.G. (2008), "On the ductility of high-strength concrete beams", Int. J. Concrete Struct. Mater., 2(2), 115-122. https://doi.org/10.4334/IJCSM.2008.2.2.115
  18. Kaar, P.H., Fiorato, A.E., Carpenter, J.E. and Corely, W.G. (1978), "Limiting strains of concrete confined by rectangular hoops", Research Report No. RD053.01D, Portland Cement Association, Skokie, IL, USA.
  19. Kaar, P.H., Hanson, N.W. and Capell, H.T. (1978), "Stress-strain characteristics of high strength concrete", Douglas McHenry International Symposium on Concrete and Concrete Structures, SP-55, Ed. B. Bresler, American Concrete Institute, Farmington Hills, MI, USA, 161-185.
  20. Khadiranaikar, R.B. and Awati, M.M. (2012), "Concrete stress distribution factors for high-performance concrete", ASCE J. Struct. Eng., 138(3), 402-415. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000465
  21. Li, B., Park, R. and Tanaka, H. (1993), "Strength and ductility of reinforced concrete members and frames constructed using high-strength concrete", Research Report No. 94-5, Department of Civil Engineering, University of Canterbury, Christchurch, New Zealand.
  22. Mattock, A.H., Kriz, L.B. and Hognestad, E. (1961), "Rectangular concrete stress distribution in ultimate strength design", ACI J., Proc., 57(8), 875-928.
  23. Mertol, H.C., Rizkalla, S., Zia, P. and Mirmiran, A. (2008), "Characteristics of compressive stress distribution in high-strength concrete", ACI Struct. J., 105(5), 626-633.
  24. Mohammadhassani, M., Suhatril, M., Shariati, M. and Ghanbari, F. (2013), "Ductility and strength assessment of HSC beams with varying of tensile reinforcement ratios", Struct. Eng. Mech., 48(6), 833-848. https://doi.org/10.12989/sem.2013.48.6.833
  25. Nedderman, H. (1973), "Flexural stress distribution in very-high strength concrete", M.Sc. Thesis, University of Texas at Arlington, TX, USA.
  26. Nilson, A.H., Darwin, D. and Dolan, C.W. (2010), Design of Concrete Structures, 14th Edition, McGraw-Hill Companies, Inc., New York, NY, USA.
  27. NZS 3101 (2006), Concrete Structures Standard, Part 1-The Design of Concrete Structures and Part 2-Commentary on the Design of Concrete Structures, Standards Association of New Zealand,Wellington, New Zealand.
  28. Ozbakkaloglu, T. and Saatcioglu, M. (2004), "Rectangular stress block for high-strength concrete", ACI Struct. J., 101(4), 475-483.
  29. Pam, H.J., Kwan, A.K.H. and Islam, M.S. (2001), "Flexural strength and ductility of reinforced normal- and high-strength concrete beams", Struct. Build., 146(4), 381-389. https://doi.org/10.1680/stbu.2001.146.4.381
  30. Pastor, J.A. (1986), "High-strength concrete beams", PhD Dissertation, Cornell University, Ithaca, NY, USA.
  31. Popovics, S. (1973), "A numerical approach to the complete stress-strain curve of concrete", Cement Concrete . 3(5), 583-599. https://doi.org/10.1016/0008-8846(73)90096-3
  32. Sargin, M., Ghosh, S.K. and Handa, V.K. (1971), "Effects of lateral reinforcement upon the strength and deformation properties of concrete", Mag. Concrete Res., 23(75-76), 99-110. https://doi.org/10.1680/macr.1971.23.76.99
  33. Sarkar, S., Adwan, O. and Munday, J.G.L. (1997), "High strength concrete: An investigation of the flexural behavior of high strength RC beams", Struct. Eng., 75(7), 115-121.
  34. Schade, J.E. (1992), "Flexural concrete stress in high strength concrete columns", M.Sc. Thesis, University of Calgary, Calgary, AB, Canada.
  35. Swartz, S.E., Nikaeen, A., Narayan Babu, H.D., Periyakaruppan, N. and Refai, T.M.E. (1985), "Structural bending properties of higher strength concrete", High-Strength Concrete, SP-88, Ed. H.G. Russell, American Concrete Institute, Farmington Hills, MI, USA, 147-178,
  36. Tan, T.H. and Nguyen, N.B. (2005), "Flexural behavior of confined high-strength concrete columns", ACI Struct. J., 102(2), 198-205.
  37. Thorenfeldt, E., Tomaszewicz, A. and Jensen, J.J. (1987), "Mechanical properties of high-strength concrete and application in design", Proceedings of Utilization of High Strength Concrete Symposium, Stavanger, Norway, Tapir, Trondheim, 149-159.
  38. Wahidi, S.A.A. (1995), "Strength and behavior of reinforced concrete columns made from high performance materials", PhD dissertation, University of Texas at Austin, Austin, Tex., USA.
  39. Whitney, C.S. (1937), "Design of reinforced concrete members under flexure or combined flexure and direct compression", ACI J., Proc., 33(3), 483-498.
  40. Yang, K.H., Sim, J.I. and Kang, T.H. (2013), "Generalized equivalent stress block model considering varying concrete compressive strength and unit weight", ACI Struct. J., 110(5), 791-799.