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Modelling of Offshore Tubular Members in Non-Linear Analyses

[+] Author Affiliations
Ken Skinner, David W. Styles, Sirous F. Yasseri

Kellogg Brown and Root, Leatherhead, Surrey, UK

Paper No. OMAE2005-67035, pp. 91-98; 8 pages
doi:10.1115/OMAE2005-67035
From:
  • ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering
  • 24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 1, Parts A and B
  • Halkidiki, Greece, June 12–17, 2005
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4195-2 | eISBN: 0-7918-3759-9
  • Copyright © 2005 by ASME

abstract

This paper presents results of a study into calibrating beam elements properties for use in non-linear finite element analyses, such that the elements simulate the behaviour of real members. Following the API approach, it is recommended that the material strength is de-rated to achieve a well-behaved element. A large number of typical “imperfect” offshore tubular members were modelled using shell elements and analysed to determine the full range of their load-displacement behaviour. The complete practical range of combination of the slenderness and D/t (diameter to thickness) ratios were considered. Then the beam elements’ material was de-rated to achieve the same results as obtained from the shell model. The result of the study is a two-way table which gives the required de-rating as a function of the slenderness ratio and the D/t ratio.

Copyright © 2005 by ASME

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