The relationship between strength and fatigue reliability of an offshore platform is an important aspect in the setting of appropriate structural inspection programs, as well as providing valuable information when considering the life extension of ageing offshore structures. This paper uses the example of a braced monopod to examine the interaction between strength and fatigue reliability for shallow-water platforms subjected to wave climates typical of the North West Shelf of Australia. The central role played by the local wave climate in both the strength and fatigue response of the structure is investigated. The probability of fatigue failure at the critical location was found to be approximately three orders of magnitude less than the overall probability of storm overload failure. This inequity between strength and fatigue reliability raises the possibility of redirecting inspection effort toward higher-risk threats such as accidental damage and corrosion. The potential for further optimizing the total life-cycle costs of new offshore structures is also briefly discussed.
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November 2003
Technical Papers
The Interaction Between Strength and Fatigue Reliability for a Minimum Structure in Shallow Water
G. K. Cole,
G. K. Cole
Centre for Oil & Gas Engineering, University of Western Australia, 35 Stirling Highway, Crawley 6009 WA
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B. F. Ronalds,
B. F. Ronalds
Centre for Oil & Gas Engineering, University of Western Australia, 35 Stirling Highway, Crawley 6009 WA
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E. Fakas
E. Fakas
Centre for Oil & Gas Engineering, University of Western Australia, 35 Stirling Highway, Crawley 6009 WA
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G. K. Cole
Centre for Oil & Gas Engineering, University of Western Australia, 35 Stirling Highway, Crawley 6009 WA
B. F. Ronalds
Centre for Oil & Gas Engineering, University of Western Australia, 35 Stirling Highway, Crawley 6009 WA
E. Fakas
Centre for Oil & Gas Engineering, University of Western Australia, 35 Stirling Highway, Crawley 6009 WA
Contributed by the OOAE Division for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received, July 20, 2001; final revision, January 2003. Associate Editor: A. Naess.
J. Offshore Mech. Arct. Eng. Nov 2003, 125(4): 281-287 (7 pages)
Published Online: October 1, 2003
Article history
Received:
July 20, 2001
Revised:
January 1, 2003
Online:
October 1, 2003
Citation
Cole , G. K., Ronalds , B. F., and Fakas, E. (October 1, 2003). "The Interaction Between Strength and Fatigue Reliability for a Minimum Structure in Shallow Water ." ASME. J. Offshore Mech. Arct. Eng. November 2003; 125(4): 281–287. https://doi.org/10.1115/1.1603311
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