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VIM and Wave-Frequency Fatigue Damage Analysis for SCRs Connected to Monocolumn Platforms

[+] Author Affiliations
Luís Volnei Sudati Sagrilo, Marcos Queija de Siqueira, Gilberto Bruno Ellwanger, Edison Castro Prates de Lima

COPPE - Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil

Thiago Ângelo Gonçalves de Lacerda

COPPE - Federal University of Rio de Janeiro, RJ, Rio de Janeiro, Brazil

Elizabeth Frauches Netto Siqueira

CENPES - Petrobras, Rio de Janeiro, RJ, Brazil

Paper No. OMAE2009-79807, pp. 723-729; 7 pages
doi:10.1115/OMAE2009-79807
From:
  • ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1: Offshore Technology
  • Honolulu, Hawaii, USA, May 31–June 5, 2009
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4341-3 | eISBN: 978-0-7918-3844-0
  • Copyright © 2009 by ASME

abstract

The large Vortex Induced Motion (VIM) due to current acting on a circular-shaped monocolumn platform induces low-frequency stress variations on the SCRs (Steel Catenary Risers) connected to it. These stresses together with stress variations associated to wave effects must be accounted for in the fatigue analysis of these risers. Normally, the joint statistics of waves and currents show that these environmental variables may be considered as statistically independent. Therefore, the number of global riser analyses necessary for the SCRs fatigue analysis becomes extremely high in order to consider a suitable number of combinations (including intensities and directions) of waves and currents. This paper describes a methodology for computing the fatigue damage in SCRs (Steel Catenary Risers) due to wave-frequency and VIM (Vortex Induced Motion) load effects based on a combination damage formula presented in DnV-OS-F204 [1]. The wave-frequency and VIM fatigue damages are calculated separately (by a time-domain rainflow approach) and the combined damage is evaluated by means of the DnV formula. This methodology reduces considerably the number of global riser analyses and consequently the computational burden associated to the fatigue analyses of SCRs connected to monocolumn-type platforms.

Copyright © 2009 by ASME

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