JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Analytical and numerical analysis for unbonded flexible risers under axisymmetric loads
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
  • Journal title : Ocean Systems Engineering
  • Volume 6, Issue 2,  2016, pp.129-141
  • Publisher : Techno-Press
  • DOI : 10.12989/ose.2016.6.2.129
 Title & Authors
Analytical and numerical analysis for unbonded flexible risers under axisymmetric loads
Guo, Yousong; Chen, Xiqia; Wang, Deyu;
 Abstract
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.
 Keywords
flexible riser;axisymmetric response;analytical model;numerical model;gap between the layers;
 Language
English
 Cited by
 References
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. crossref(new window)

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. crossref(new window)

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. crossref(new window)

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. crossref(new window)

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. crossref(new window)

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. crossref(new window)

10.
Saevik, S. and Berge, S. (1995), "Fatigue testing and theoretical studies of two4 in flexible pipes", Eng. Struct., 17(4), 276-292. crossref(new window)

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. crossref(new window)

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. crossref(new window)

13.
Witz, J.A.A. (1996), "Case study in the cross-section analysis of flexible risers", Mar. Struct., 9(9), 885-904. crossref(new window)

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.