生涯コストミニマム基準による構造疲労設計および検査計画の改善

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Structural safety against fatigue failure is an important design consideration for ships and offshore structures. Sufficient safety is achieved through well-balanced use of several safety items at design, fabrication and inspection maintenance. Each safety item has a certain cost and it is of importance to minimize total expected cost during the life-time of the structure. In this study, life-time cost minimization method and its consistent formulations are developed for structures with fatigue deterioration. Optimization parameters are fatigue life, initial defect conditions, inspection times and inspection qualities for structure. The sequential cost minimization method developed by authors is employed for the optimization of inspection strategy. Trade-off study is carried out to search the optimal fatigue lives and initial defect conditions of members. Proposed method is examined for the three types of optimization problems: optimization of inspection schedule for a member set which has been designed based on a certain fatigue criterion, optimization of fatigue life for a member set which has a prefixed inspection schedule, and optimization of both fatigue lives and inspection strategy for a newly developed structure. The results of numerical examples show that the sequential cost minimization method and the trade-off approach are useful for the improvements of fatigue design and inspection maintenance of actual structures, since they can avoid several difficulties caused by multistage decision process.
社団法人日本船舶海洋工学会の論文
1992-03-29

生涯コストミニマム基準による構造疲労設計および検査計画の改善

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