DOI QR코드

DOI QR Code

Flexural ductility of RC beam sections at high strain rates

  • Pandey, Akhilesh K. (CSIR-Central Building Research Institute)
  • Received : 2011.12.14
  • Accepted : 2013.05.24
  • Published : 2013.10.25

Abstract

Computation of flexural ductility of reinforced concrete beam sections has been proposed by taking into account strain rate sensitive constitutive behavior of concrete and steel, confinement of core concrete and degradation of cover concrete during load reversal under earthquake loading. The estimate of flexural ductility of reinforced concrete rectangular sections has been made for a wide range of tension and compression steel ratios for confined and unconfined concrete at a strain rate varying from $3.3{\times}10^{-5}$ to 1.0/sec encountered during normal and earthquake loading. The parametric studies indicated that flexural ductility factor decreases at increasing strain rates. Percentage decrease is more for a richer mix concrete with the similar reinforcement. The confinement effect has marked influence on flexural ductility and increase in ductility is more than twice for confined concrete (0.6 percent volumetric ratio of transverse steel) compared to unconfined concrete. The provisions in various codes for achieving ductility in moment resisting frames have been discussed.

References

  1. ACI 318-08, Building code requirements for structural concrete and commentary, ACI Manual for Concrete Practice, American Concrete Institute, Farmington Hills, Michigan.
  2. Al-Haddad, M.S. (1995), "Curvature ductility of reinforced concrete beams under low and high strain rates", ACI Struct. J., 92(5), 526-534.
  3. Asprone, D., Cadoni, E. and Prota, A. (2009), "Tensile high strain rate behavior of reinforcing steel from an existing bridge", ACI Struct. J., 106(4), 523-529.
  4. Asprone, D., Frascadore, R., Di Ludovico, M., Prota, A. and Manfredi, G. (2012), "Influence of strain rate on the seismic response of RC structures", Eng. Struct., 35, 29-36. https://doi.org/10.1016/j.engstruct.2011.10.025
  5. Au, F.T.K., Chan, K.H.E., Kwan, A.K.H. and Du, J.S. (2009), "Flexural ductility of pestressed concrete beams with unbounded tendons", Comput. Concr., 6(6), 451-472. https://doi.org/10.12989/cac.2009.6.6.451
  6. Au, F.T.K., Cliff, C.Y.L. and Kwan, A.K.H. (2011), "Flexural ductility and deformability of reinforced and prestressed concrete sections", Comput. Concr., 8(4), 473-489. https://doi.org/10.12989/cac.2011.8.4.473
  7. Cadoni, E., Dotta, M., Forni, D. and Tesio, N. (2011), "Dynamic behavior of reinforcing bars in tension", Appl. Mech. Mater., 82, 86-91. https://doi.org/10.4028/www.scientific.net/AMM.82.86
  8. CEB (1988), "Concrete structures under impact and impulsive Loading", Synthesis Report, Bulletin d'Information, 187, (Committee Euro International di Beton Lausanne 1988).
  9. Cowell, W.C. (1965), Dynamic Tests of Concrete Reinforcing Steel, Technical Report R-394, US NavalCivil Engineering Laboratory, Port Hueneme, California September 1965.
  10. Dilger, W.H., Koch, R. and Kowalczyk, R. (1984), "Ductility of plane and confined concrete under different strain rate", ACI J., 81(1), 73-81.
  11. Filiatrault, A. and Holleran, M. (2001), "Stress-strain behavior of reinforcing steel and concrete under seismic strain rates and low temperatures", Mater. Struct., 34(238), 235-239. https://doi.org/10.1007/BF02480594
  12. Grote, D.L., Park, S.W. and Zhou, M. (2001), "Dynamic behaviour of concrete at high strain rates and pressures: Experimental characterization", Int. J. Impact Eng., 25(9), 869-886. https://doi.org/10.1016/S0734-743X(01)00020-3
  13. Hatano, T. and Tsutsumi, H. (1960), "Dynamical compressive deformation and failure of concrete under earthquake load", Second World Conference on Earthquake Engg., 1963-1968.
  14. Hognestad, E., Hanson N. and Mc Henry, D. (1955), "Concrete stress distribution in ultimate strength design", ACI J., 52(6), 455-479.
  15. Hughes, B.P. and Gregory, R. (1972), "Concrete subjected to high rates of loading in compression", Mag. Concrete. Res., 24(78), 25-37. https://doi.org/10.1680/macr.1972.24.78.25
  16. IS 13920-1993, Ductile detailing of reinforced concrete structures subjected to seismic forces -Code of Practice, Bureau of Indian Standards, New Delhi.
  17. Kent, D.C. (1971), "Flexural members with confined Concrete", J. Struct. Div., ASCE, 97(7), 1969-1990.
  18. Kwan, A.K.H. Au, F.T.K. and Chau, S.L. (2004), "Theoretical study of effect of confinement on flexural ductility of normal and high strength concrete beams", Mag. Concrete Res., 56(5), 299-309. https://doi.org/10.1680/macr.2004.56.5.299
  19. Lee, T.K. and Pan, A.D.E. (2003), "Estimating the relationship between tension reinforcement and ductility of reinforced concrete beam sections", Eng. Struct., 25, 1057-1067. https://doi.org/10.1016/S0141-0296(03)00048-8
  20. Mahin, S.A. and Bertero, V.V. (1983), Rate of Loading Effects on Cracked And Repaired Reinforced Concrete Members, Report No. UCB/CERC-72/9, Earthquake Engineering and Research Centre, University of California, Berkeley, California.
  21. Meander, J.B., Priestley, M.J.N. and Park, R. (1988), "Theoretical stress-strain model for confined Concrete", J. Struct. Eng., ASCE, 114(8), 1804-1825. https://doi.org/10.1061/(ASCE)0733-9445(1988)114:8(1804)
  22. NZS 3101 (2006), Part I: The Design of Concrete Structures and Part II Commentry, Standards New Zealand, Wellington.
  23. Park, R. and Paulay (1975), Design of Reinforced Concrete Structures, John Wiley and Sons, New York, 769.
  24. Park, R. and Ruitong, D. (1988), "Ductility of doubly reinforced concrete sections", ACI Struct. J., 84(2), 526-534.
  25. Ross, C.A., Tedesco, J.W. and Hughes, M.L. (1995), "Effects of strain rate on concrete strength", ACI J., 92(1), 37-47.
  26. Scott, B.D., Park, R. and Priestely, M.J.N. (1982), "Stress-strain behaviour of concrete confined by overlapping hoops at low and high strain rates", ACI J., 79(1), 13-27.
  27. Soroushian, P., Choi, K.B. and Alhamad, A. (1986a), "Dynamic constitutive behaviour of concrete", ACI J., 83(2), 251-259.
  28. Soroushian, P. and Obaseki, K. (1986b), "Strain rate-dependent interaction diagrams for reinforced concrete sections", ACI J., 83(1), 108-116.
  29. Soroushian, P. and Choi, K.B. (1987), "Steel mechanical properties at different strain rates, J. Struct. Eng. ASCE, 113(4), 663-672. https://doi.org/10.1061/(ASCE)0733-9445(1987)113:4(663)
  30. Staffer and Sozen (1975), Effect of Strain Rate on Yield Stress on Model Reinforcement, Stuctural Research Sites No 415, Civil Engineering Studies, University of Illonois Urbana III.
  31. Wang, P., Shah, S. and Naaman, A. (1978), "High strength concrete in ultimate strength design", J. Struct. Div., ASCE, 104(11), 1761-1773.
  32. Xiao, S., Li, H. and Lin, G. (2008), "Dynamic behaviour and constitutive model of concrete at different strain rates", Mag. Concrete Res., 60(4), 271-278. https://doi.org/10.1680/macr.2008.60.4.271
  33. Yan, D. and Lin, G. (2007), "Dynamic behaviour of concrete in biaxial compression", Mag. Concrete Res., 59(1), 45-52. https://doi.org/10.1680/macr.2007.59.1.45
  34. Zhang, M., Wu, H.J., Li, Q.M. and Huang, F.L. (2009), "Further investigation on dynamic compressive strength enhancement of concrete like materials based on Split Hopkinson Pressure Bar test", Part-I experiments, Int. J. Impact Eng., 36(12), 1327-1334. https://doi.org/10.1016/j.ijimpeng.2009.04.009

Cited by

  1. Effect of loading rate on cyclic behavior of reinforced concrete beams 2017, https://doi.org/10.1177/1369433217737114
  2. Numerical study of dynamic behaviour of RC beams under cyclic loading with different loading rates vol.67, pp.7, 2015, https://doi.org/10.1680/macr.14.00239
  3. Flexural ductility of reinforced and prestressed concrete sections with corrugated steel webs vol.16, pp.4, 2015, https://doi.org/10.12989/cac.2015.16.4.625