Efficient reliability-based design of mooring systems
Conference
·
OSTI ID:449733
- MARINTEK, Trondheim (Norway)
Uncertainties both in the environmentally induced load effects and in the strength of mooring line components make a rational design of mooring systems a complex task. The methods of structural reliability, taking these uncertainties into account, have been applied in an efficient probabilistic analysis procedure for the tension overload limit state for mooring lines. This paper outlines the philosophy and methodology for this procedure, followed by numerical examples of a turret moored ship. Both base case annual failure probabilities and results from a number of sensitivity analyses are presented. It is demonstrated that the reliability-based design procedure can be effectively utilized to quantify the safety against failure due to tension overload of moorings. The results of the case studies indicate that the largest uncertainties are associated with the distribution parameters of the chain link and steel wire rope segment tension capacity, and the modelling of the environment. The modelling of spreading angles between waves, wind and current vs. colinearity, and double-peaked vs. single-peaked wave spectrum models are key parameters in the reliability assessment.
- OSTI ID:
- 449733
- Report Number(s):
- CONF-9606279--; ISBN 0-7918-1490-4
- Country of Publication:
- United States
- Language:
- English
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