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Estimation of Equivalent Dynamic Amplification Factor (EDAF) on a Jacket Structure

[+] Author Affiliations
Gro Sagli Baarholm, Atle Johansen, Jørn Birknes

Det Norske Veritas AS, Oslo, Norway

Sverre Haver

Statoil ASA, Stavanger, Norway

Paper No. OMAE2013-10085, pp. V001T01A006; 9 pages
doi:10.1115/OMAE2013-10085
From:
  • ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1: Offshore Technology
  • Nantes, France, June 9–14, 2013
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5531-7
  • Copyright © 2013 by ASME

abstract

Non-linear time domain irregular wave simulations have been performed for the Kvitebjørn jacket platform located in the North Sea with the aim to quantify the dynamic amplification. The jacket is a slender structure installed in about 190m water depth.

For each of the selected extreme sea states both quasi-static and dynamic response simulations have been carried out for several wave realizations using different seeds. Based on the quasi-static response and dynamic response, equivalent dynamic amplification factors (EDAFs) were calculated for different response measures in the jacket. EDAF is the factor one has to multiply the q-probability quasi-static response with in order to obtain an adequate estimate of the q-probability dynamic response. The EDAFs are to be used in ultimate limit state (ULS) and accidental limit state (ALS) analyses of the platform.

Simulations were performed applying a Gaussian wave with Wheeler stretching and a second-order wave model.

This paper focuses on the selection of wave kinematics method and on the establishment of the EDAF analysis procedure.

Copyright © 2013 by ASME

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