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Numerical studies on axially loaded doubler plate reinforced elliptical hollow section T-joints

  • Sari, Busra (Department of Civil Engineering, Gumushane University) ;
  • Ozyurt, Emre (Department of Civil Engineering, Gumushane University)
  • Received : 2021.06.21
  • Accepted : 2022.04.06
  • Published : 2022.04.10

Abstract

This paper presents results of numerical studies completed on unreinforced and doubler plate reinforced Elliptical Hollow Section (EHS) T-joints subjected to axial compressive loading on the brace member. Non-linear finite element (FE) models were developed using the finite element code, ABAQUS. Available test data in literature was used to validate the FE models. Subsequently, a parametric study was carried out to investigate the effects of various geometrical parameters of main members and reinforcement plates on the ultimate capacity of reinforced EHS T-joints. The parametric study found that the reinforcing plate significantly increases the ultimate capacity of EHS T-joints up to twice the capacity of the corresponding unreinforced joint. The thickness and length of the reinforcing plate have a positive effect on the ultimate capacity of Type 1 joints. This study, however, found that the capacity of Type 1 orientation is not dependent on the brace-to-chord diameter ratio. As for type 2 orientations, the thickness and length of the reinforcement have a minimal effect on the ultimate capacity. A new design method is introduced to predict the capacity of the reinforced EHS T-joints Type 1 and 2 based on the multiple linear regression analyses.

Keywords

Acknowledgement

The authors gratefully acknowledge the valuable comments and suggestions of reviewers on the draft version of this paper.

References

  1. ABAQUS/Standard (2017), Dassault Systemes Simulia Corporation, Providence, Version 6.17-1 ed. USA.
  2. Bortolotti, E., Jaspart, J.-P., Pietrapertosa, C., Nicaud, G., Petitjean, P., Grimault, J. and Michard, L. (2017), "Testing and modelling of welded joints between elliptical hollow sections", Tubular Structures X. Routledge.
  3. CEN (2005), Design of Steel Structures, EN 1993-1-8-Design of Joints. London, Brussels, Belgium.
  4. Cheng, Y.F. (2011), "A comparison of large......", Struct. Eng. Mech., 91(4), 1301-1328. https://doi.org/10.12989/sem.2011.91.4.1301.
  5. Choo, Y., Liang, J. and Lim, L. (2017), "Static strength of elliptical hollow section X-joint under brace compression", Tubular Structures X. Routledge.
  6. Feng, R., Chen, Y. and Chen, D. (2017), "Experimental and numerical investigations on collar plate and doubler plate reinforced SHS T-joints under axial compression", Thin-Walled Struct., 110, 75-87. https://doi.org/10.1016/j.tws.2016.10.017.
  7. Gao, F., Guan, X.Q., Zhu, H.P. and Liu, X.N. (2015), "Fire resistance behaviour of tubular T-joints reinforced with collar plates", J. Construct. Steel Res., 115, 106-120. https://doi.org/10.1016/j.jcsr.2015.07.021.
  8. Gao, F., Tang, Z., Guan, X., Zhu, H. and Chen, Z. (2018), "Ultimate strength of tubular T-joints reinforced with doubler plates after fire exposure", Thin-Walled Struct., 132, 616-628. https://doi.org/10.1016/j.tws.2018.09.021.
  9. Gao, F., Zhu, H., Liang, H. and Tian, Y. (2017), "Post-fire residual strength of steel tubular T-joint with concrete-filled chord", J. Construct. Steel Res., 139, 327-338. https://doi.org/10.1016/j.jcsr.2017.09.015.
  10. Haque, T., Packer, J.A. and Zhao, X.L.J.A.I.S.E. (2012), "Equivalent RHS approach for the design of EHS in axial compression or bending", Adv. Struct. Steel, 15, 107-120. https://doi.org/10.1260/1369-4332.15.1.107.
  11. Lesani, M., Bahaari, M. and Shokrieh, M. (2013), "Numerical investigation of FRP-strengthened tubular T-joints under axial compressive loads", Compos. Struct., 100, 71-78. https://doi.org/10.1016/j.compstruct.2012.12.020.
  12. Lesani, M., Bahaari, M. and Shokrieh, M. (2014), "Experimental investigation of FRP-strengthened tubular T-joints under axial compressive loads", Construct. Build. Mater., 53, 243-252. https://doi.org/10.1016/j.conbuildmat.2013.11.097.
  13. Liu, H., Shao, Y., Lu, N. and Wang, Q. (2015), "Hysteresis of concrete-filled circular tubular (CFCT) T-joints under axial load", Steel Compos. Struct., 18(3), 739-756. http://doi.org/10.12989/scs.2015.18.3.739.
  14. Nassiraei, H. (2019a), "Local joint flexibility of CHS X-joints reinforced with collar plates in jacket structures subjected to axial load", Appl. Ocean Res., 93, 101961. https://doi.org/10.1016/j.apor.2019.101961.
  15. Nassiraei, H. (2019b), "Static strength of tubular T/Y-joints reinforced with collar plates at fire induced elevated temperature", Marine Struct., 67, 102635. https://doi.org/10.1016/j.marstruc.2019.102635.
  16. Nassiraei, H. (2020a), "Geometrical effects on the LJF of tubular T/Y-joints with doubler plate in offshore wind turbines", Ships Offshore Struct, 1-11. https://doi.org/10.1080/17445302.202.0.1835051.
  17. Nassiraei, H. (2020b), "Local joint flexibility of CHS T/Y-connections strengthened with collar plate under in-plane bending load: parametric study of geometrical effects and design formulation", Ocean Eng., 202, 107054. https://doi.org/10.1016/j.oceaneng.2020.107054.
  18. Nassiraei, H. and Rezadoost, P.J.E.S. (2021a), "Static capacity of tubular X-joints reinforced with fiber reinforced polymer subjected to compressive load", Eng. Struct., 236, 112041. https://doi.org/10.1016/j.engstruct.2021.112041.
  19. Nassiraei, H. and Rezadoost, P.J.M.S. (2021b), "Local joint flexibility of tubular T/Y-joints retrofitted with GFRP under in-plane bending momentv", Marine Struct., 77, 102936. https://doi.org/10.1016/j.marstruc.2021.102936.
  20. Nassiraei, H., Lotfollahi-Yaghin, M.A. and Ahmadi, H. (2016a), "Static performance of doubler plate reinforced tubular T/Y-joints subjected to brace tension", Thin-Wall. Struct., 108, 138-152. https://doi.org/10.1016/j.tws.2016.08.012.
  21. Nassiraei, H., Lotfollahi-Yaghin, M.A. and Ahmadi, H. (2016b), "Static strength of collar plate reinforced tubular T/Y-joints under brace compressive loading", J. Construct. Steel Res., 119, 39-49. https://doi.org/10.1016/j.jcsr.2015.12.011.
  22. Nassiraei, H., Lotfollahi-Yaghin, M.A., Ahmadi, H. and Zhu, L. (2017), "Static strength of doubler plate reinforced tubular T/Y-joints under in-plane bending load", J. Construct. Steel Res., 136, 49-64. https://doi.org/10.1016/j.jcsr.2017.05.009.
  23. Nassiraei, H., Lotfollahi-Yaghin, M.A., Neshaei, S.A. and Zhu, L. J.M.S. (2018), "Structural behavior of tubular X-joints strengthened with collar plate under axially compressive load at elevated temperaturesv", Marine Struct., 61, 46-61. https://doi.org/10.1016/j.marstruc.2018.03.012.
  24. Nassiraei, H., Mojtahedi, A., Lotfollahi-Yaghin, M.A. and Zhu, L. (2019), "Capacity of tubular X-joints reinforced with collar plates under tensile brace loading at elevated temperatures", Thin-Wall. Struct., 142, 426-443. https://doi.org/10.1016/j.tws.2019.04.042.
  25. Nassiraei, H., Zhu, L., Gu, C.J.S. and Structures, O. (2021), "Static capacity of collar plate reinforced tubular X-connections subjected to compressive loading: study of geometrical effects and parametric formulation", Ships Offshore Struct., 16, 54-69. https://doi.org/10.1080/17445302.2019.1708041.
  26. Ozyurt, E. (2020), "Finite element study on axially loaded reinforced Square Hollow Section T-joints at elevated temperatures", Thin-Wall. Struct., 148, 106582. https://doi.org/10.1016/j.tws.2019.106582.
  27. Ozyurt, E. and Das, S. (2019), "Experimental and numerical studies on axially loaded reinforced square hollow section T-joints", Eng. Struct., 192, 323-334. https://doi.org/10.1016/j.engstruct.2019.05.012.
  28. Ozyurt, E. and Wang, Y. (2018), "Resistance of axially loaded T-and X-joints of elliptical hollow sections at elevated temperatures-A finite element study", Structures. 14, 15-31. https://doi.org/10.1016/j.istruc.2018.01.004.
  29. Ozyurt, E. and Yilmaz, M. (2019), "Duzlem Ici Egilme Momenti Altindaki Elips Enkesitli T-birlesimlerinin Dayanimlari", Gumushane Fen Bilimleri Dergisi, 9, 547-556. https://doi.org/10.17714/gumusfenbil.504444.
  30. Packer, J., Choo, Y., Shen, W., Wardenier, J., Van der Vegte, G. and Mustard, T.J.C.F.R. (2012), "Axially loaded T and X joints of elliptical hollow sections", CIDECT Final Rep, (5BW-2), 12.
  31. Packer, J.A., Wardenier, J., Zhao, X.L., van der Vegte, G.J. and Kurobane, Y. (2009), Design Guide for Rectangular Hollow Section (RHS) Joints Under Predominantly Static Loading. Verlag TUV Rheinland, Germany, CIDECT.
  32. Qu, H., Huo, J., Xu, C. and Fu, F. (2014), "Numerical studies on dynamic behavior of tubular T-joint subjected to impact loading", Int. J. Impact Eng., 67, 12-26. https://doi.org/10.1016/j.ijimpeng.2014.01.002.
  33. Qu, H., Li, A., Huo, J. and Liu, Y. (2017), "Dynamic performance of collar plate reinforced tubular T-joint with precompression chord", Eng. Struc., 141, 555-570. https://doi.org/10.1016/j.engstruct.2017.03.037.
  34. Shao, Y.B. (2016), "Static strength of collar-plate reinforced tubular T-joints under axial loading", Steel Compos. Struct., 21, 323-342. http://dx.doi.org/10.12989/scs.2016.21.2.323.
  35. Shao, Y.B., Lie, S.T. and Chiew, S.P. (2010), "Static strength of tubular T-joints with reinforced chord under axial compression", Adv. Struct. Eng., 13, 369-377. https://doi.org/10.1260/1369-4332.13.2.369.
  36. Thandavamoorthy, T. (2003), "Comparative behaviour of stiffened and unstiffened welded tubular joints of offshore platforms", Steel Compos. Struct., 3(5), 321-331. http://dx.doi.org/10.12989/scs.2003.3.5.321.
  37. van der Vegte, G.J. and Makino, Y. (2010), "Further research on chord length and boundary conditions of CHS T-and X-joints", Ad. Steel Construct., 6, 879-890.
  38. Wardenier, J., van der Vegte, G.J. and Liu, D. (2007), "Chord stress function for rectangular hollow section X and T joints", The Seventeenth International Offshore and Polar Engineering Conference. International Society of Offshore and Polar Engineers.