Ocean Systems Engineering

  • 제6권2호
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  • Pages.129-141
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  • 2016
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  • 2093-6702(pISSN)
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  • 2093-677X(eISSN)
테크노프레스 (Techno-Press)
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Analytical and numerical analysis for unbonded flexible risers under axisymmetric loads

  • Guo, Yousong (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University) ;
  • Chen, Xiqia (Tianjin Branch, CNOOC Ltd.) ;
  • Wang, Deyu (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University)
  • 투고 : 2016.03.02
  • 심사 : 2016.05.10
  • 발행 : 2016.06.25
⟨ 이전 논문 다음 논문 ⟩

초록

Due to the structural complexity, the response of a flexible riser under axisymmetric loads is quite difficult to determine. Based on equilibrium conditions, geometrical relations and constitutive equations, an analytical model that can accurately predict the axisymmetric behavior of flexible risers is deduced in this paper. Since the mutual exclusion between the contact pressure and interlayer gap is considered in this model, the influence of the load direction on the structural behavior can be analyzed. Meanwhile, a detailed finite element analysis for unbonded flexible risers is conducted. Based on the analytical and numerical models, the structural response of a typical flexible riser under tension, torsion, internal and outer pressure has been studied in detail. The results are compared with experimental data obtained from the literature, and good agreement is found. Studies have shown that the proposed analytical and numerical models can provide an insightful reference for analysis and design of flexible risers.

키워드

참고문헌

  1. Bahtui, A., Bahai, H. and Alfano, G.A. (2008a), "Finite element analysis for unbonded flexible risers under axial tension", Proceedings of the 27th International Conference on Offshore Mechanics and Arctic Engineering, Estoril.
  2. Bahtui, A., Bahai, H. and Alfano, G.A. (2008b), "Finite element analysis for unbonded flexible risers under torsion", J. Offshore Mech. Arct., 130(4), 041301. https://doi.org/10.1115/1.2948956
  3. Claydon, P., Cook, G., Brown, P. et al. (1992), "A theoretical approach to prediction of service life of unbonded flexible risers under dynamic loading conditions", Mar. Struct., 5(5), 399-429. https://doi.org/10.1016/0951-8339(92)90011-D
  4. Do, K.D. (2011), "Global stabilization of three-dimensional flexible marine risers by boundary control", Ocean Syst. Eng., 1(2), 171-194.
  5. Feret, J.J. and Bournazel, C.L. (1987), "Calculation of stresses and slip in structural layers of unbonded flexible risers", J. Offshore Mech. Arct., 109(3), 263-269. https://doi.org/10.1115/1.3257019
  6. Huang, H., Zhang, J. and Zhu, L. (2013), "Numerical model of a tensioner system and riser guide", Ocean Syst. Eng., 3(4), 257-273. https://doi.org/10.12989/ose.2013.3.4.257
  7. Lanteigne, J. (1985), "Theoretical estimation of the response of helically armored cables to tension, torsion, and bending", J. Appl. Mech. -T ASME, 52, 423-432. https://doi.org/10.1115/1.3169064
  8. Mcnamara, J.F. and Harte, AM. (1989), "Three dimensional analytical simulation of flexible pipe wall structure", Proceedings of the 8th International Conference on Offshore Mechanics and Arctic Engineering.
  9. Ramos R., Jr. and Pesce, C.P.A. (2004), "Consistent analytical model to predict the structural behavior of flexible risers subjected to combined loads", J. Offshore Mech. Arct., 126(2), 141-146. https://doi.org/10.1115/1.1710869
  10. Saevik, S. and Berge, S. (1995), "Fatigue testing and theoretical studies of two4 in flexible pipes", Eng. Struct., 17(4), 276-292. https://doi.org/10.1016/0141-0296(95)00026-4
  11. Saevik, S. and Bruaseth, S. (2005), "Theoretical and experimental studies of the axisymmetric behaviour of complex umbilical cross-sections", J. Appl. Ocean Res., 27(2), 97-106. https://doi.org/10.1016/j.apor.2005.11.001
  12. Witz, J.A. and Tan, Z. (1992), "On the axial-torsional structural behaviour of flexible risers", J. Umbilicals Marine Cables Marine Struct., 5(2-3), 205-227. https://doi.org/10.1016/0951-8339(92)90029-O
  13. Witz, J.A.A. (1996), "Case study in the cross-section analysis of flexible risers", Mar. Struct., 9(9), 885-904. https://doi.org/10.1016/0951-8339(95)00035-6
  14. Zhang, W. and Tuohy, J. (2002), "Application of finite element modelling in the qualification of large diameter unbonded flexible risers", Proceedings of the 21st International Conference on Offshore Mechanics and Arctic Engineering, Oslo.
  15. Zou, J. (2011), "Semisubmersible platforms with Steel Catenary Risers for Western Australia and Gulf of Mexico", Ocean Syst. Eng., 2(2), 99-113. https://doi.org/10.12989/ose.2012.2.2.099