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Cost-Benefit Assessment of inspection and repair planning for Ship Structures Considering Corrosion Model Uncertainty

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China Ocean Engineering 2005年第3期19卷 409-420页

作者：李典庆唐文勇张圣坤 State Key Laboratory of Water Resources and Hydropower Engineering Sciences Wuhan University Wuhan 430072 ChinaSchool of Naval Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai200030 China School of Naval Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai200030 China

Owing to high costs and unnecessary inspections necessitated by the traditional inspection planning for ship structures, the risk-based inspection and repair planning should be investigated for the most cost-effective inspection. This paper aims to propose a cost-benefit assessment model of risk-based inspection and repair planning for ship structures subjected to corrosion deterioration. Then, the benefit-cost ratio is taken to be an index for the selection of the optimal inspection and repair strategy. The planning problem is formulated as an optimization problem where the benefit-cost ratio for the expected lifetime is maximized with a constraint on the minimum acceptalbe reliability index. To account for the effect of corrosion model uncertainty on the cost-benefit assessment, two corrosion models, namgly, Paik＇ s model and Guedes Soares＇ model, are adopted for analysis. A numerical example is presented to illustrate the proposed method. Sensitivity studies are also providet. The results indicate that the proposed method of risk-based cost-benefit analysis can effectively integrate the economy with reliability of the inspection and repair planning. A balance can be achieved between the risk cost and total expected inspection and repair costs with the proposed method, which is very. effective in selecting the optimal inspection and repair strategy. It is pointed out that the corrosion model uncertainty and parametric uncertaintg have a significant impact on the cost-benefit assessment of inspection and repair planning.

关键词： ship structures inspection and repair planning cost-benefit model uncertainty

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