Structural Engineering and Mechanics

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Finite element simulation for steel tubular members strengthened with FRP under compression

  • El-Kholy, Ahmed M. (Department of Civil Engineering, Faculty of Engineering, Fayoum University) ;
  • Mourad, Sherif A. (Department of Structural Engineering, Faculty of Engineering, Cairo University) ;
  • Shaheen, Ayman A. (Department of Civil Engineering, Faculty of Engineering, Fayoum University) ;
  • Mohamed, Yomna A. (Department of Civil Engineering, Faculty of Engineering, Fayoum University)
  • Received : 2019.02.15
  • Accepted : 2019.07.17
  • Published : 2019.12.10
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Abstract

Tubular steel sections are widespread all over the world because of their strength and aesthetic appearance. Tubular steel members may exhibit local buckling such as elephant foot or overall buckling under extreme compression load. Recently, external bonding of fiber reinforced polymers (FRP) sheets for strengthening these members has been explored through experimental research. This paper presents three-dimensional nonlinear finite element analysis (FEA) to investigate the structural behavior of strengthening tubular steel members with FRP against local and overall buckling phenomena. Out-of-roundness and out-of-straightness imperfections were introduced to the numerical models to simulate the elephant foot and overall buckling, respectively. The nonlinear analysis preferences such as the integration scheme of the shell elements, the algorithm for solution of nonlinear equations, the loading procedure, the bisection limits for the load increments, and the convergence criteria were set, appropriately enough, to successfully track the sophisticated buckling deformations. The agreement between the results of both the presented FEA and the experimental research was evident. The FEA results demonstrated the power of the presented rigorous FEA in monitoring the plastic strain distribution and the buckling phenomena (initiation and propagation). Consequently, the buckling process was interpreted for each mode (elephant foot and overall) into three sequential stages. Furthermore, the influence of FRP layers on the nonlinear analysis preferences and the results was presented.

Keywords

References

  1. ANSYS, Inc. (2011), ANSYS Structural Analysis Guide - Release 14, SAS IP, Inc., Southpointe, Canonsburg, PA, USA.
  2. Avcar, M. (2014), "Elastic buckling of steel columns under axial compression", American J. Civil Eng., 2(3), 102-108. https://doi.org/10.11648/j.ajce.20140203.17.
  3. Batikha, M., Chen, J.F., Rotter, J.M. and Teng, J.G. (2009), "Strengthening metallic cylindrical shells against elephant's foot buckling with FRP", Thin-Walled Struct., 47(10), 1078-1091. https://doi.org/10.1016/j.tws.2008.10.012.
  4. Bukovska, P. and Karmazinova, M. (2012), "Behaviour of the tubular columns filled by concrete subjected to buckling compression", Procedia Eng., 40, 68-73. https://doi.org/10.1016/j.proeng.2012.07.057.
  5. Chen, J.F., Rotter, J.M. and Teng, J.G. (2006), "A simple remedy for elephant's foot buckling in cylindrical silos and tanks", Adv. Struct. Eng., 9(3), 409-420. https://doi.org/10.1260/136943306777641968
  6. Dundu, M. (2012), "Compressive strength of circular concrete filled steel tube columns", Thin-Walled Struct, 56, 62-70. https://doi.org/10.1016/j.tws.2012.03.008.
  7. El-Kholy, A.M., Morsy U.A. and Mourad, S.A. (2014), "Imperfection modeling using finite element approach with particular discretization", J. Struct. Eng. (ASCE), 140(7), P. http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000950.
  8. Gao, X.Y., Balendra, T. and Koh, C.G. (2013), "Buckling strength of slender circular tubular steel braces strengthened by CFRP", Eng. Struct., 46, 547-556. https://doi.org/10.1016/j.engstruct.2012.08.010.
  9. Ghaemdoust, M.R., Narmashiri, K. and Yousefi, O. (2016). "Structural behaviors of deficient steel SHS short columns strengthened using CFRP", Construct. Build. Mater., 126, 1002-1011. https://doi.org/10.1016/j.conbuildmat.2016.09.099.
  10. Moradi, M., and Arwade, S.R. (2014), "Improving buckling response of the square steel tube by using steel foam", Struct. Eng. Mech., 51(6), 1017-1036. https://doi.org/10.12989/SEM.2014.51.6.1017.
  11. Narmashiri, K. and Mehramiz, G. (2016), "Strengthening of steel hollow pipe sections subjected to transverse loads using CFRP", Struct. Eng. Mech., 60(1), 163-173. https://doi.org/10.12989/SEM.2016.60.1.163.
  12. Nishino, T. and Furukawa, T. (2004), "Strength and deformation capacities of circular hollow section steel member reinforced with carbon fiber", Proceedings of 7th Pacific Structural Steel Conference (American Institute of Steel Construction), CA, USA, March.
  13. Ohga, M., Takaue, A., Shigematsu, T., and Hara, T. (2001). "Effects of initial imperfections on nonlinear behaviors of thin-walled members", Struct. Eng. Mech., 11(5), 519-534. https://doi.org/10.12989/SEM.2001.11.5.519.
  14. Ostapenko, A. and Grimm, D.F. (1980), "Local buckling of cylindrical tubular columns made of A-36 steel", Fritz Engineering Laboratory Report No. 450.7; Lehigh University, PA, USA.
  15. Shaat, A. and Fam, A. (2006), "Axial loading tests on short and long hollow structural steel columns retrofitted using carbon fiber reinforced polymers", Canadian J. Civil Eng., 33(4), 458-470. https://doi.org/10.1139/l05-042.
  16. Shahraki, M., Sohrabi, M.R., Azizyan, G.R., and Narmashiri, K. (2018), "Experimental and numerical investigation of strengthened deficient steel SHS columns under axial compressive loads", Struct. Eng. Mech., 67(2), 207-217. https://doi.org/10.12989/SEM.2018.67.2.207.
  17. Teng, J.G. and Hu, Y.M. (2007), "Behaviour of FRP-jacketed circular steel tubes and cylindrical shells under axial compression", Construct. Build. Mater., 21(4), 827-838. https://doi.org/10.1016/j.conbuildmat.2006.06.016.
  18. Vogler, T.J. and Kyriakides, S. (2001), "On the initiation and growth of kink bands in fiber composites: Part I. experiments", J. Solids Struct., 38(15), 2639-51. https://doi.org/10.1016/S0020-7683(00)00174-8.