Development of Reliability-Based Renewal Criteria for Marine Structures
Abstract:A method is proposed for developing renewal criteria for marine structures based on the reliability approach. It accounts for structures' degradation over time and uncertainties of loads. Thus, the implied risk in geometry-based renewal criteria for marine structures can be revealed. The governing failure mode is first determined, and then the time-variant reliability of the structure is calculated. Then, the probability of exceeding given permissible limits in geometry-based renewal criteria is calculated for any year of the ship's age or for any time period. Combining the two types of calculations, conditions are obtained for when the control of the geometric properties truly represents the control of the structural reliability. An example is given for vertically corrugated bulkheads used in tankers, but the method is general and can be applied to any structural component or marine structure as a whole. The method presented by the authors allows for evaluating the effect of corrosion protection with the risk that the example corrugated structure will exceed given permissible limits over time. The methodology can be used in the optimization process in the early design stage as a predictive tool or during operation.
Document Type: Research Article
Publication date: October 1, 2007
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