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Effective Bending Stiffness of an Unbonded Flexible Riser

[+] Author Affiliations
John Zhang, Zhimin Tan, Terry Sheldrake

Wellstream International Limited, Houston, TX

Paper No. OMAE2008-57098, pp. 117-123; 7 pages
  • ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 3: Pipeline and Riser Technology; Ocean Space Utilization
  • Estoril, Portugal, June 15–20, 2008
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4820-3 | eISBN: 0-7918-3821-8
  • Copyright © 2008 by ASME


A simplified model is proposed for describing the hysteresis behaviour of an unbonded flexible pipe during bending. The model has been developed based on available bending test data and numerical studies. Using the model, a simplified hysteresis loop for a given flexible pipe under specified loading conditions can be evaluated. With the simplified hysteresis loop, the global dynamic analysis and the fatigue life analysis of a flexible riser can be conducted more efficiently without loss of accuracy.

Copyright © 2008 by ASME



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