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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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Risk Based Optimal Inspection and Repair Planning for ship structures Subjected to Corrosion Deterioration

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海洋工程：英文版 2004年第2期18卷 185-196页

作者：李典庆张圣坤唐文勇 School of Naval Architecture and Ocean Engineering

A framework of risk based inspection and repair planning was presented to optimize for the ship structures subjected to corrosion deterioration. The planning problem was formulated as an optimization problem where the expected lifetime costs were minimized with a constraint on the minimum acceptable reliability index. The safety margins were established for the inspection events, the repair events and the failure events for ship structures. Moreover, the formulae were derived to calculate failure probabilities and repair probabilities. Based on them, a component subjected to corrosion is investigated for illustration of the process of selecting the optimal inspection and repair strategy. Furthermore, some sensitivity studies were provided. The results show that the optimal inspection instants should take place before the reliability index reaches the minimum acceptable reliability index. The optimal target failure probability is 10 -3 . In addition, a balance can be achieved between the risk cost and total expected inspection and repair costs by means of the risk-based optimal inspection and repair method, which is very effective in selecting the optimal inspection and repair strategy.

关键词： risk inspection and repair optimization corrosion model ship structures

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考虑碰撞或搁浅破损的船体结构可靠性分析

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Journal of Marine Science and Application 2020年第4期19卷 717-733页

作者： Branka BužančićPrimorac Joško Parunov C.Guedes Soares Faculty of Electrical Engineering Mechanical Engineering and Naval ArchitectureUniversity of SplitSplitCroatia Faculty of Mechanical Engineering and Naval Architecture University of ZagrebZagrebCroatia Centre of Marine Technology and Ocean Engineering(CENTEC)Instituto Superior Técnico Universidade de LisboaLisbonPortugal

Classical structural reliability analysis of intact ship hulls is extended to the case of ships with collision or grounding *** water load distribution and residual bending moment capacity are included as random variables in the limit state *** probability density functions of these random variables are defined based on random damage parameters given by the Marine Environment Protection Committee of the International Maritime Organization,while the proposed reliability formulation is consistent with international recommendations and thus may be valuable in the development of rules for accidental limit *** methodology is applied on an example of an Aframax oil *** proposed approach captures in a rational way complex interaction of different pertinent variables influencing safety of damaged ship structure.

关键词： ship structures Hull girder Collision and grounding Damaged oil tanker Residual strength Uncertainty modelling Structural reliability

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An Overview on Strength and Safety of Marine structures

An Overview on Strength and Safety of Marine Structures

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第六届船舶力学学术委员会全体会议

作者： Cui Weicheng (China ship Scientific Research Center)

The proceedings of ISSC 2006 have provided a comprehensive review on the strength and safety of marine structures including ships and offshore platforms. However, relevant information are distributed in many technical committee reports such as II.1 QUASI-STATIC RESPONSE, III.1 ULTIMATE STRENGTH, III.2 FATIGUE AND FRACTURE, IV.1 DESIGN PRINCIPLES AND CRITERIA, V.1 COLLISION AND GROUNDING, V.3 FABRICATION TECHNOLOGY, V.6 CONDITION ASSESSMENT OF AGED shipS. The purpose of this paper is to summarize the important information related to the current research status on strength and safety of marine structures.

关键词： ship structures offshore structures ultimate strength buckling strength yielding strength initial imperfections residual stresses in-service degradation fatigue corrosion crack propagation uncertainties reliability safety

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船体梁抗弯能力的计算

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中国造船 1984年第1期 67-77页

作者：桑国光龚恢上海交通大学

在船舶纵弯曲强度的可靠性分析中,需要计算船体梁的抗弯能力,本文提供一种实用计算方法。在此方法中取材料厚度(或剖面积)和屈服限、弹性模量等均为随机变量,利用随机函数的线性化原理,求得船体断面几何要素以及抗弯能力的统计特征值。... 详细信息

在船舶纵弯曲强度的可靠性分析中,需要计算船体梁的抗弯能力,本文提供一种实用计算方法。在此方法中取材料厚度(或剖面积)和屈服限、弹性模量等均为随机变量,利用随机函数的线性化原理,求得船体断面几何要素以及抗弯能力的统计特征值。文中还介绍了国产船用钢材的厚度和屈服极限的变异系数,并利用组合梁模型试验资料对采用梁模型带来的计算误差及其修正办法作了讨论。该计算方法采用了造船人员熟悉的常规强度计算中的格式,便于在船舶设计中应用。

关键词： ship structures reliability analysis random variables linear theory of random function computational method.

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