International Journal of Naval Architecture and Ocean Engineering

The Society of Naval Architects of Korea (대한조선학회)
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Axial compressive residual ultimate strength of circular tube after lateral collision

  • Li, Ruoxuan (Dept. of Maritime Engineering, Graduate School of Engineering, Kyushu University) ;
  • Yanagihara, Daisuke (Dept. of Marine Systems Engineering, Faculty of Engineering, Kyushu University) ;
  • Yoshikawa, Takao (Dept. of Marine Systems Engineering, Faculty of Engineering, Kyushu University)
  • Received : 2018.03.28
  • Accepted : 2018.07.21
  • Published : 2019.01.31
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Abstract

The tubes which are applied in jacket platforms as the supporting structure might be collided by supply vessels. Such kind of impact will lead to plastic deformation on tube members. As a result, the ultimate strength of tubes will decrease compared to that of intact ones. In order to make a decision on whether to repair or replace the members, it is crucial to know the residual strength of the tubes. After being damaged by lateral impact, the simply supported tubes will definitely loss a certain extent of load carrying capacity under uniform axial compression. Therefore, in this paper, the relationship between the residual ultimate strength of the damaged circular tube by collision and the energy dissipation due to lateral impact is investigated. The influences of several parameters, such as the length, diameter and thickness of the tube and the impact energy, on the reduction of ultimate strength are investigated. A series of numerical simulations are performed using nonlinear FEA software LS-DYNA. Based on simulation results, a non-dimensional parameter is introduced to represent the degree of damage of various size of tubes after collision impact. By applying this non-dimensional parameter, a simplified formula has been derived to describe the relationship between axial compressive residual ultimate and lateral impact energy and tube parameters. Finally, by comparing with the allowable compressive stress proposed in API rules (RP2A-WSD A P I, 2000), the critical damage of tube due to collision impact to be repaired is proposed.

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References

  1. Abramowicz, W., Jones, N., 1984. Dynamic axial crushing of circular tubes. Int. J. Impact Eng. 2 (3), 263-281. https://doi.org/10.1016/0734-743X(84)90010-1
  2. Amdahl, J., 1983. Energy Absorption in Ship-platform Impacts. Division of Marine Structures, University of Trondheim. Report No. UR-83-34, Trondheim, Norway, September.
  3. Bela, A., Le Sourne, H., Buldgen, L., et al., 2017. Ship collision analysis on offshore wind turbine monopile foundations. Mar. Struct. 51, 220-241. https://doi.org/10.1016/j.marstruc.2016.10.009
  4. Cowper, G.R., Symonds, P.S., 1957. Strain-hardening and Strain-rate Effects in the Impact Loading of Cantilever Beams. Brown Univ Providence Ri.
  5. Hu, Z.Q., Wang, G., Liu, K., et al., 2016. Energy dissipation of tubular member of jacket platform under ship lateral impact scenario. Proc. ICCGS 15-18.
  6. Hu, Z., Jiang, C., Liu, K., 2016. Towards numerical simulation and model test verifications for an analytical model of tubular member under lateral impact scenario. In: ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers. V009T12A007-V009T12A007.
  7. LS-DYNA(R) Keyword User's Manual, 2012. Version 971 R6.1.0. Livermore Software Technology Corporation (LSTC).
  8. Mamalis, A.G., Johnson, W., 1983. The quasi-static crumpling of thin-walled circular cylinders and frusta under axial compression. Int. J. Mech. Sci. 25 (9-10), 713-732. https://doi.org/10.1016/0020-7403(83)90078-4
  9. Minorsky, V.U., 1958. An Analysis of Ship Collisions with Reference to protection of Nuclear Power Plants. Sharp (George G.) Inc., New York.
  10. RP2A-WSD A P I, 2000. Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms-working Stress Design. Twenty.
  11. Storheim, M., Amdahl, J., 2014. Design of offshore structures against accidental ship collisions. Mar. Struct. 37, 135-172. https://doi.org/10.1016/j.marstruc.2014.03.002
  12. Tai, Y.S., Huang, M.Y., Hu, H.T., 2010. Axial compression and energy absorption characteristics of high-strength thin-walled cylinders under impact load. Theor. Appl. Fract. Mech. 53 (1), 1-8. https://doi.org/10.1016/j.tafmec.2009.12.001
  13. Travanca, J., Hao, H., 2015. Energy dissipation in high-energy ship-offshore jacket platform collisions. Mar. Struct. 40, 1-37. https://doi.org/10.1016/j.marstruc.2014.10.008
  14. Watan, R., 2011. Analysis and Design of Columns in Offshore Structures Subjected to Supply Vessel Collisions.
  15. Wierzbicki, T., Suh, M.S., 1988. Indentation of tubes under combined loading. Int. J. Mech. Sci. 30 (3), 229-248. https://doi.org/10.1016/0020-7403(88)90057-4
  16. Yu, Z., Amdahl, J., 2018. Analysis and design of offshore tubular members against ship impacts. Mar. Struct. 58, 109-135. https://doi.org/10.1016/j.marstruc.2017.11.004