A study of probabilistic fatigue assessment methods for offshore structures confirmed that fatigue life predictions for offshore welded joints is dominated by uncertainties in hot spot stress estimation, arising from uncertainties in nominal stress and stress concentration factors. Analysis of data from previous fatigue studies on North Sea jacket structures conducted in the late 1980s suggests that nominal stresses are, in general, overestimated by about 30% and the COV of the bias is about 0.35. The study demonstrated that in-service fatigue failure probability is not only dependent on the COV but also on the median bias of the nominal stress range. A number of nominal stress COVs are recommended with associated median values for general offshore application. Distributions are also suggested for other variables such as Miner’s damage sum and the S-N design curve coefficients. Methods based on long-term stress range distribution with random parameters to cater for uncertainties in stress estimation are described and example calculations are given.
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ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
June 15–20, 2008
Estoril, Portugal
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4822-7
PROCEEDINGS PAPER
Probabilistic S-N Fatigue Assessment Methods for Welded Joints in Offshore Structures
A. Stacey
A. Stacey
Health & Safety Executive, London, UK
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A. Muhammed
TWI Ltd., Abington, Cambride, UK
A. Stacey
Health & Safety Executive, London, UK
Paper No:
OMAE2008-57505, pp. 335-354; 20 pages
Published Online:
July 27, 2009
Citation
Muhammed, A, & Stacey, A. "Probabilistic S-N Fatigue Assessment Methods for Welded Joints in Offshore Structures." Proceedings of the ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. Volume 5: Materials Technology; CFD and VIV. Estoril, Portugal. June 15–20, 2008. pp. 335-354. ASME. https://doi.org/10.1115/OMAE2008-57505
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