Computers and Concrete

  • 제3권1호
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  • Pages.17-28
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  • 2006
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  • 1598-8198(pISSN)
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  • 1598-818X(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Effect of strain ratio variation on equivalent stress block parameters for normal weight high strength concrete

  • Kumar, Prabhat (Structural Engineering Division, Central Building Research Institute)
  • 투고 : 2005.10.24
  • 심사 : 2006.01.24
  • 발행 : 2006.02.25
⟨ 이전 논문 다음 논문 ⟩

초록

Replacement of actual stress distribution in a reinforced concrete (RC) flexural member with a simpler geometrical shape, which maintains magnitude and location of the resultant compressive force, is an acceptable conceptual trick. This concept was originally perfected for normal strength concrete. In recent years, high strength concrete (HSC) has been introduced and widely used in modern construction. The stress block parameters require updating to account for special features of HSC in the design of flexural members. In future, more varieties of concrete may be developed and a corresponding design procedure of RC flexural members will be required. The usual practice is to conduct large number of experiments on various sizes of specimen and then evolve an empirical relation. This paper presents a numerical procedure through which the stress block parameters can be numerically derived for a given strain ratio variation. The material model for concrete is presented and computational procedure is described. This procedure is illustrated with several variations of strain ratio. The advantages of numerical procedure are that it costs less and it can be used with new material models for any new variety of concrete.

키워드

참고문헌

  1. ACI 318 (2004), Building Code Requirements for Reinforced Concrete. American Concrete Institute, USA
  2. AS 3600-1994, Standards Association of Australia, Sydney, Australia, 1994
  3. Attard, M. M. and Setunge, S. (1996), 'Stress strain relationship of confined and unconfined concrete', ACI Mater. J., 93(5), 432-442
  4. Attard, M. M. and Steward, M. G. (1998), 'A two parameter stress block for high strength concrete', ACI Struct. J., 95(2), 305-317
  5. Bernardo, L. F. A. and Lopes, S. M. R. (2004), 'Neutral axis depth Vs flexural rigidity in high strength concrete beams', J. Struct. Eng., ASCE, 130(ST3), 452-459 https://doi.org/10.1061/(ASCE)0733-9445(2004)130:3(452)
  6. CAN 3-A 23.3-M (1994), 'Design of concrete structures for buildings', Canadian Standards Association, Canada
  7. Collins, M. P. and Mitchell, D. (1991), Pre-stressed Concrete Structures. Prentice Hall, Englewood Cliffs, USA
  8. Comite Euro International du Beton (1995), 'High performance concrete', Bulletin d' Information No. 228, Laussane, Switzerland
  9. Desai, P. and Krishnan, S. (1964), 'Equation for stress strain curves of concrete', ACI J., 61(3), 345-350
  10. Eurocode 2: 'Design of concrete structures 'Part 1-I. General rules and rules for buildings'. European committee of Standerdization. [see also NS 3473 (1989), Norwegian standard for design of concrete structures. The Norwegian Council for Building Standardization (NBR), Oslo, Norway.]
  11. Hognestad, E. (1951), 'A study of combined bending and axial load in reinforced concrete members', Bulletin 399, Eng. Experimental Station, Univ. of Illinois, USA
  12. Hognestad, E., Hanson, N. W. and McHenry, D. (1955), 'Concrete stress distribution in ultimate strength design', ACI J., 52(6), 455-479
  13. Ibrahim, H. and MacGregor, J. G. (1997), 'Modification of ACI rectangular block for high strength concrete columns', ACI Struct. J., 94(1), 1997, 40-48
  14. Kahn, L. F. and Meyer, K. F. (1995), 'Rectangular stress block for non - rectangular compression zone', ACI Struct. J., 92(3), 304-310
  15. Karr, P. H., Hanson, N. W. and Capell, H. T. (1978), 'Stress strain characteristics of high strength concrete', ACI SP 55-7, Douglas McHenry International Symposium on Concrete and Concrete Structures, 161185
  16. Kumar, P. (2003), 'A second order material model for unconfined concrete under uni-axial compression', Indian Concrete Institute J., 4(2), 23-26
  17. Kumar, P. (2004a), 'Structural design of high strength concrete beams', Indian Concrete Institute J., 5(1), Apr-June, 27-35
  18. Kumar, P. (2004b), 'Ultimate strength of high strength concrete beams', Indian Concrete Institute J., 5(2), July-Sept, 7-15
  19. Leslie, K. E. Rajagopalan, K. S. and Evarard, N. J. (1976), 'Flexural behavior of high strength concrete beams', ACI J., 73(9), 517-521
  20. Mansur, M. A., Chin, M. S. and Wee, T. H. (1997), 'Flexural behavior of high strength concrete beams', ACI Struct. J., 94(6), 663-674
  21. Mattock, A., Kriz, L. and Hognestad, E. (1961), 'Concrete stress distribution in ultimate strength design', ACI J., 57, 875-928
  22. NZS 3101 (1995), Design of Concrete Structures. Standards New Zealand, Wellington, New Zealand
  23. Ozbakkaloglu, T. and Saatcioglu, M. (2004), 'Rectangular stress block for high strength concrete', ACI Struct. J., 101(4), 475-483
  24. Sarkar, S., Adwan, O. and Munday, G. L. (1997), 'High strength concrete: an investigation of the flexural behavior of high strength RC beams', The Structural Engineer (UK), 75(7), 115-121
  25. Smith G. M. and Young, L. E. (1955) 'Ultimate flexural analysis based on stress strain curves of cylinders', ACI J., 53(6), 597-609
  26. Wang, P. T., Shah, S. P. and Naaman, A. E. (1978), 'Stress strain curves of normal and lightweight concrete in compression', ACI J., 75, 603-611
  27. Wee, T. H., Chin, M. S. and Mansur, M. A. (1996), 'Stress strain relationship of high strength concrete in compression', J. Mater. Civ. Eng., ASCE, 8(2), 70-76 https://doi.org/10.1061/(ASCE)0899-1561(1996)8:2(70)

피인용 문헌

  1. Maximum concrete stress developed in unconfined flexural RC members vol.8, pp.2, 2006, https://doi.org/10.12989/cac.2011.8.2.207