船舶縱向結構之系統可靠度分析

System Reliability Analysis of a Ship Longitudinal Structure

在具有高度不確定性與複雜性的海洋環境中，以極限強度與系統可靠度為基準的分析方法是評估結構安全陸的方法之一。一般船體結構通常使用板架做為船殼主體，故不研究以典型的板架結構系統為主要的分析模型來進行船體系統可靠度分析。文中將採用有限元素法與一階二次矩司靠度方法進行箱型板架結構的系統可靠度分析。本研究將首先考慮一箱型板架結構中板加強材以及加強板架之並聯組合系統分析，最後以一散裝貨輪之縱向結構進行系統可靠度分析、以期求得船體結構的整體失效機率。 One of the best ways to evaluate the safety of structures in highly uncertain and complicated ocean environment is to use the ultimate strength analysis and the system reliability analysis. Generally, the ship hulls are made of stiffened plates. In this study, a typical box girder with various stiffeners is employed as ship-type model for system reliability analysis. In this research Butte element method and the Best order second-moment reliability method ate applied to evaluate the system reliability of ship structures. First, a ship-type box girder is selected as an example to evaluate time system reliability. Parallel system of plates and stiffeners with associated plates are considered Finally, the failure probability on the midship section of a bulk carrier is evaluated by using thin system reliability method. It is believed that the global probability of failure of a ship can be obtained by utilizing the above system reliability analysis method.