Steel and Composite Structures

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Stress concentration factors test of reinforced concrete-filled tubular Y-joints under in-plane bending

  • Yang, Jun-fen (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Yang, Chao (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Su, Ming-zhou (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Lian, Ming (School of Civil Engineering, Xi'an University of Architecture and Technology)
  • Received : 2015.12.20
  • Accepted : 2016.09.27
  • Published : 2016.09.20
⟨ Previous Next ⟩

Abstract

To study the stress concentration factors (SCFs) of concrete-filled tubular Y-joints subject to in-plane bending, experiments were used to investigate the hot spot stress distribution along the intersection between chord and brace. Three concrete-filled tubular chords forming Y-joints were tested with different reinforcing components, including doubler-plate, sleeve, and haunch-plate reinforcement. In addition, an unreinforced joint was also tested for comparison. Test results indicate that the three different forms of reinforcement effectively reduce the peak SCFs compared with the unreinforced joint. The current research suggests that the linear extrapolation method can be used for chords, whereas the quadratic extrapolation method must be used for braces. The SCF is effectively reduced and more evenly distributed when the value of the axial compression ratio in the chord is increased. Furthermore, the SCFs obtained from the test results were compared to predictions from some well-established SCF equations. Generally, the predictions from those equations are very consistent for braces, but very conservative for concrete-filled chords.

Keywords

Acknowledgement

Supported by : SGCC (State Grid Corporation of China)

References

  1. Ahmadi, H. and Lotfollahi-Yaghin, M.A. (2015), "Stress concentration due to in-plane bending (IPB) loads in ring-stiffened tubular KT-joints of offshore structures: Parametric study and design formulation", Appl. Ocean Res., 51, 54-66. https://doi.org/10.1016/j.apor.2015.02.009
  2. API (2005), Recommended practice for planning, designing and constructing fixed offshore platforms; API recommended practice (RP 2A), Washington, D.C., USA.
  3. Chen, B. (1990), "Review of studies in China on stress analysis of ring stiffened tubular joints for offshore structures", Proceedings of the 9th International Conference on Offshore Mechanical and Arctic Engineering, ASME, New York, NY, USA, January, pp. 313-319.
  4. Chen, Y. and Wang, J. (2015), "Axial compression physical testing of traditional and bird beak SHS Tjoints", J. Central South Univ., 22(6), 2328-2338. https://doi.org/10.1007/s11771-015-2758-5
  5. Chen, J., Chen, J. and Jin, W.L. (2010), "Experiment investigation of stress concentration factor of concretefilled tubular T joints", J. Construct. Steel Res., 66(12), 1510-1515. https://doi.org/10.1016/j.jcsr.2010.06.004
  6. DNV (2005), Fatigue strength analysis of offshore of steel structures; Det Norske Veritas, Norway.
  7. Fricke, W. (2002), "Recommended hot spot analysis procedure for structural details of FPSO's and ships based on round-robin FE analyses", Int. J. Offshore Eng., 12(1), 40-47.
  8. HSE (1993), Offshore technology report-fatigue life enhancement of tubular joints by grouted injection; Health and Safety Executive, Liverpool, UK.
  9. Hoon, K.H., Wong, L.K. and Soh, A.K. (2001), "Experimental investigation of a doubler-plate reinforced tubular T-joint subjected to combined loadings", J. Construct. Steel Res., 57(9), 1015-1039. https://doi.org/10.1016/S0143-974X(01)00023-2
  10. Lalani, M., Moran, D.J., Van-Froken, R.J. and Wardenier, J. (1996), "Fatigue behavior and ultimate capacity of grouted tubular joints", Proceedings of the 6th International Symposium on Tubular Structures, Miskolc, Hungary, pp. 349-354.
  11. Lloyd's Register of Shipping (1980), Fatigue Analysis of Fixed Steel Platform Tubular Joints, Lloyd's Register of Shipping Publication, London, UK.
  12. Lloyd's Register of Shipping (1988), Investigation into differences between the measured hot-spot stress when derived by either linear extrapolation techniques; Lloyd's Register of Shipping, London, UK.
  13. Lotsberg, I. (2011), "On stress concentration factors for tubular Y-and T-Joints in frame structures" Marine Structures, 24(1), 60-69. https://doi.org/10.1016/j.marstruc.2011.01.002
  14. Marshall, E.W. (1977), Interpretive Report on Grouted K-Joints, Shell Oil Company Publication, Hauge, Netherland.
  15. Mashiri, F.R. and Zhao, X.L. (2010), "Square hollow section (SHS) T-joints with concrete-filled chords subjected to in-plane fatigue loading in the brace", Thin-Wall. Struct., 48(2), 150-158. https://doi.org/10.1016/j.tws.2009.07.010
  16. Munaswamy, K., Swamidas, A.S.J., Hopkins, R.M., Monahan, C. and Vosikovsky, O. (1989), "Experimental study on fatigue of stiffened tubular T-joints", Proceedings of the 8th International Conference on Offshore Mechanical and Arctic Engineering, ASME, New York, USA, December, pp. 375-382.
  17. Murthy, D.S.R., Rao, A.G.M., Gandhi, P., Thandavamoorthy, T.S., Pant, P.K. and Murty, V.S.R. (1991), "Analytical and experimental investigations on internally ring stiffened steel tubular joints", Proceedings of ISFF '91; Fracture and Fatigue in Steel and Concrete Structures, Rotterdam, Netherlands, December, pp. 715-728.
  18. Soh, A.K., Soh, C.K. and Hoon, K.H. (1994), "Stress analysis of reinforced tubular joints subjected to different load types", ICE-Struct. Build., 104(3), 257-266. https://doi.org/10.1680/istbu.1994.26776
  19. Tong, L.W., Wang, K., Shi, W.Z. and Chen, Y.Y. (2010), "Experimental study on hot spot stress of welded concrete filled CHS T-joints", J. Tongji Univ. (Natural Science), 38(3), 329-334. [In Chinese]
  20. Underwater Engineering Group (1985), Design of Tubular Joints for Offshore Structures, UEG Publication UR33, London, UK.
  21. Wang, K., Tong, L.W., Zhu, J. Zhao, X. and Mashiri, F. (2013), "Fatigue behavior of welded T-joints with a CHS brace and CFCHS chord under axial loading in the brace", J. Bridge Eng., 18(2), 142-152. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000331
  22. Xu, F., Chen, J. and Jin, W.L. (2015), "Experimental investigation of SCF distribution for thin-walled concrete-filled CHS joints under axial tension loading", Thin-Wall. Struct., 93, 149-157. https://doi.org/10.1016/j.tws.2015.03.019
  23. Zhao, X.-L., Herion, S., Packer, J.A., Puthli, R.S., Sedlacek, G., Wardenier, J., Weynand, K., van Wingerde, A. and Yeomans, N. (2001), Design Guide for Circular and Rectangular Hollow Section Joints under Fatigue Loading, CIDECT, Germany.

Cited by

  1. Static test on failure process of tubular T-joints with initial fatigue crack vol.24, pp.5, 2016, https://doi.org/10.12989/scs.2017.24.5.615
  2. Elastic analysis of arbitrary shape plates using Meshless local Petrov-Galerkin method vol.27, pp.4, 2016, https://doi.org/10.12989/was.2018.27.4.235
  3. Optimum Design of Infinite Perforated Orthotropic and Isotropic Plates vol.8, pp.4, 2016, https://doi.org/10.3390/math8040569