Reliability assessment of mooring lines for floating structures considering statistical parameter uncertainties |
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| Institution: | 1. Programa de Posgrado, Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, México, DF C.P. 07730, Mexico;2. Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, México, DF C.P. 07730, Mexico;1. Centre for Offshore Foundation Systems, The University of Western Australia, Australia;2. The University of Southampton, UK;1. College of Engineering, Ocean University of China, Qingdao, 266100 PR China;2. Boskalis Offshore Energy Division, Shanghai, 200040 PR China |
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| Abstract: | This work focuses on the effect of parameter uncertainty on the reliability index and on the predictive reliability of mooring lines for floating structures under loading from extreme sea-states. A first-order analytic formulation is developed which takes into consideration uncertain parameters in the statistical models of the maximum dynamic tension and the breaking resistance of the mooring lines. Expressions are derived for the mean and the variance of the reliability index in terms of the mean values and the covariance matrix of the uncertain parameters, and of the sensitivity of the reliability index to the uncertain parameters. The predictive reliability index is expressed in terms of the mean and the variance of the reliability index. The formulation is applied to case studies of catenary and taut-leg mooring lines of an offshore structure and the relative effects of the sources of statistical uncertainty are assessed. The case studies demonstrated the applicability and capability of the formulation to capture and represent the relative contributions of the different sources of uncertainty on the predictive reliability and predictive failure probability, as well as on the statistics of the uncertain reliability index. |
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| Keywords: | Mooring lines Parameter uncertainty Uncertain reliability index Predictive reliability Mooring reliability Floating systems |
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