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Effects of Waves and Currents on Extreme Loads on a Jacket

[+] Author Affiliations
Kjersti Bruserud

Statoil ASA, Stavanger, NorwayNTNU, Trondheim, Norway

Sverre Haver

University of Stavanger, Stavanger, NorwayNTNU, Trondheim, Norway

Paper No. OMAE2015-41257, pp. V001T01A003; 10 pages
doi:10.1115/OMAE2015-41257
From:
  • ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1: Offshore Technology; Offshore Geotechnics
  • St. John’s, Newfoundland, Canada, May 31–June 5, 2015
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5647-5
  • Copyright © 2015 by ASME

abstract

In lack of simultaneous data of metocean parameters such as wind, waves and currents, Norwegian design regulations presently recommend a conservative combination of metocean parameters for estimation of characteristic metocean loads on offshore structures. A simplified parametric load model for a jacket, based on waves and currents, is assumed. Several approaches to load estimation are investigated and the following are considered; different averaging length of extreme currents, the effect of peak-over-threshold approach for estimation of extreme wave and currents compared to all-sea states approach and extreme load estimation directly from a load time series. When compared to the recommended approach, all other approaches yield a reduced estimated characteristic metocean load. The results are intended be illustrative and not suitable for use in design.

Copyright © 2015 by ASME
Topics: Stress , Waves , Currents

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