Computers and Concrete

  • 제22권6호
  • /
  • Pages.527-538
  • /
  • 2018
  • /
  • 1598-8198(pISSN)
  • /
  • 1598-818X(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Local buckling of reinforcing steel bars in RC members under compression forces

  • Minafo, Giovanni (Department of Civil, Environmental, Aerospace and Materials Engineering - DICAM, University of Palermo)
  • 투고 : 2018.10.02
  • 심사 : 2018.12.15
  • 발행 : 2018.12.25
⟨ 이전 논문 다음 논문 ⟩

초록

Buckling of longitudinal bars is a brittle failure mechanism, often recorded in reinforced concrete (RC) structures after an earthquake. Studies in the literature highlights that it often occurs when steel is in the post elastic range, by inducing a modification of the engineered stress-strain law of steel in compression. A proper evaluation of this effect is of fundamental importance for correctly evaluating capacity and ductility of structures. Significant errors can be obtained in terms of ultimate bending moment and curvature ductility of an RC section if these effects are not accounted, as well as incorrect evaluations are achieved by non-linear static analyses. This paper presents a numerical investigation aiming to evaluate the engineered stress-strain law of reinforcing steel in compression, including second order effects. Non-linear FE analyses are performed under the assumption of local buckling. A role of key parameters is evaluated, making difference between steel with strain hardening or with perfectly plastic behaviour. Comparisons with experimental data available in the literature confirm the accuracy of the achieved results and make it possible to formulate recommendations for design purposes. Finally, comparisons are made with analytical formulations available in the literature and based on obtained results, a modification of the stress-strain law model of Dhakal and Maekawa (2002) is proposed for fitting the numerical predictions.

키워드

참고문헌

  1. Bayrak, O. and Sheikh, S.A. (2001), "Plastic hinge analysis", J. Struct. Eng., 127(9), 1092-1100. https://doi.org/10.1061/(ASCE)0733-9445(2001)127:9(1092)
  2. Bechtoula, H., Sakashita, M., Kono, S. and Watanabe, F. (2005), "Seismic performance of 1/4-scale RC frames subjected to axial and cyclic reversed lateral loads", Comput Concrete, 2(2), 147-164. https://doi.org/10.12989/cac.2005.2.2.147
  3. Campione, G. and Minafo, G. (2010), "Compressive behavior of short high-strength concrete columns", Eng. Struct., 32(9), 2755-66. https://doi.org/10.1016/j.engstruct.2010.04.045
  4. Can Girgin, S., Moharrami, M. and Koutromanos, I. (2018) "Nonlinear beam-based modeling of RC columns including the effect of reinforcing bar buckling and rupture", Earthq. Spectra, 34(3), 1289-1309. https://doi.org/10.1193/063017EQS136M
  5. Cervenka, V. and Cervenka, J. (2016), ATENA Program Documentation Part 1- Theory, Prague, Cervenka, Consulting s.r.o.
  6. Dhakal, R.P. and Maekawa, K. (2002), "Modeling of post-yield buckling of reinforcement", J. Struct. Eng., ASCE, 128(9), 1139-1147. https://doi.org/10.1061/(ASCE)0733-9445(2002)128:9(1139)
  7. Dodd, L.L. and Restrepo-Posada, J.I. (1995), "Model for Giovanni Minafo predicting cyclic behavior of reinforcing steel", J. Struct. Eng., ASCE, 121(3), 433-445. https://doi.org/10.1061/(ASCE)0733-9445(1995)121:3(433)
  8. Gomes, A. and Appleton, J. (1997), "Nonlinear cyclic stress-strain relationship of reinforcing bars including buckling", Eng. Struct., 19(10), 822-826. https://doi.org/10.1016/S0141-0296(97)00166-1
  9. Kolwankar, S., Kanvinde, A., Kenawy, M. and Kunnath, S. (2017), "Uniaxial monlocal formulation for geometric nonlinearity-induced necking and buckling localization in a steel bar", J. Struct. Eng., ASCE, 143(9), 04017091. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001827
  10. Le Hoang, A. and Fehling, E. (2017), "Numerical analysis of circular steel tube confined UHPC stub columns", Comput. Concrete, 19(3), 263-273. https://doi.org/10.12989/cac.2017.19.3.263
  11. Mander, J. (1983), "Seismic design of bridge piers", Ph. D. Thesis, University of Canterbury, Christchurch, New Zealand.
  12. Mander, J.B., Panthaki, F.D. and Kasalanati, A. (1994), "Low-cycle fatigue behavior of reinforcing steel", J. Mater. Civil Eng., 6(4), 453-468. https://doi.org/10.1061/(ASCE)0899-1561(1994)6:4(453)
  13. Massone, L.M. and Moroder, D. (2009), "Buckling modeling of reinforcing bars with imperfections", J. Struct. Eng., 31(3), 758-767. https://doi.org/10.1016/j.engstruct.2008.11.019
  14. Menegotto, M. and Pinto, P. (1973), "Method of analysis for cyclically loaded reinforced concrete plane frames including changes in geometry and non-elastic behavior of elements under combined normal force and bending", Proceedings of IABSE Symposium on Resistance and Ultimate Deformability of Structures Acted on by Well Defined Repeated Loads, International Association for Bridge and Structural Engineering, Zurich, Switzerland.
  15. Minafo, G. and Papia, M. (2017), "Theoretical approaches for modelling buckling effects in rebars of RC members", Bull. Earthq. Eng., 15(12), 5309-5327. https://doi.org/10.1007/s10518-017-0184-9
  16. Monti, G. and Nuti, C. (1992), "Nonlinear Cyclic Behavior of Reinforcing Bars Including Buckling", J. Struct. Eng., ASCE, 118(12), 3268-3284. https://doi.org/10.1061/(ASCE)0733-9445(1992)118:12(3268)
  17. OpenSees (Computer software), Pacific Earthquake Engineering Research Center, Univ. of California, Berkeley, CA.
  18. Razvi, S. and Saatcioglu, M. (1999) "Confinement model for high-strength concrete", J. Struct. Eng., ASCE, 125(3), 281-288. https://doi.org/10.1061/(ASCE)0733-9445(1999)125:3(281)
  19. Rice, J.R. (1975), "Continuum mechanics and thermodynamics of plasticity in relation to microscale deformation mechanisms", Constitutive Equations in Plasticity, Massachusetts Institute of Technology Press, Cambridge.
  20. Shirmohammadi, F. and Esmaeily, A. (2016), "Software for biaxial cyclic analysis of reinforced concrete columns", Comput. Concrete, 17(3), 353-386. https://doi.org/10.12989/cac.2016.17.3.353
  21. Urmson, C. and Mander, J. (2012), "Local buckling analysis of longitudinal reinforcing bars", J. Struct. Eng., ASCE, 138(1), 62-71. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000414
  22. Yon, B. and Calay, Y. (2014), "Effects of confinement reinforcement and concrete strength on nonlinear behaviour of RC buildings", Comput. Concrete, 14(3), 279-297. https://doi.org/10.12989/CAC.2014.14.3.279
  23. Zong, Z., Kunnath, S. and Monti, G. (2013), Simulation of reinforcing bar buckling in circular reinforced concrete columns", J. Struct. Eng., 110(4), 607-661.

피인용 문헌

  1. Development of a user-friendly and transparent non-linear analysis program for RC walls vol.25, pp.4, 2018, https://doi.org/10.12989/cac.2020.25.4.327