Reliability-based assessment of ship hull girder ultimate strength

IF 1.1 Q4 MECHANICS Curved and Layered Structures Pub Date : 2023-01-01 DOI:10.1515/cls-2022-0189

R. Adiputra, T. Yoshikawa, Erwandi Erwandi

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引用次数: 8

Abstract

Abstract A reliability-based approach is presented to investigate the effects of structural and load uncertainties on the reliability estimation of ship hull girders. Structural uncertainties included randomness in material properties, geometric properties, initial geometric imperfections, and corrosion behavior. Load uncertainties included statistical uncertainties, model uncertainties, environmental uncertainties, and uncertainties related to nonlinearity. The hull girder ultimate strength was calculated using Smith’s method, and the probabilistic density function was evaluated by employing Monte Carlo simulations. In the load estimation, the still water bending moment and wave-induced bending moment were calculated using a simplified formula of the International Association of Classification Societies-Common Structural Rules code and then modified with load parameters. The reliability index was estimated using a first-order reliability method considering the operating time, the duration of the ship in the alternate hold loading condition, and the severity of the corrosion rate. As a result, sagging conditions dominated the collapse mode. The reliability indexes were obtained for the observed cases, and the viability of the ship was assessed accordingly.

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基于可靠性的船体梁极限强度评估

摘要提出了一种基于可靠性的方法，研究结构和荷载不确定性对船体大梁可靠性估计的影响。结构不确定性包括材料特性、几何特性、初始几何缺陷和腐蚀行为的随机性。负荷不确定性包括统计不确定性、模型不确定性、环境不确定性和非线性不确定性。采用Smith法计算船体梁的极限强度，采用蒙特卡罗模拟计算概率密度函数。在荷载估计中，采用国际船级社协会通用结构规则的简化公式计算静水弯矩和波浪引起的弯矩，并根据荷载参数进行修正。采用一阶可靠性方法，综合考虑船舶的运行时间、船舶在交替货舱装载状态下的持续时间和腐蚀速率的严重程度，对船舶的可靠性指标进行了估计。结果表明，沉降条件主导坍塌模式。对观测情况进行了可靠性指标分析，并对船舶的生存能力进行了评价。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Curved and Layered Structures MECHANICS-

CiteScore

2.60

自引率

13.30%

发文量

审稿时长

14 weeks

期刊介绍： The aim of Curved and Layered Structures is to become a premier source of knowledge and a worldwide-recognized platform of research and knowledge exchange for scientists of different disciplinary origins and backgrounds (e.g., civil, mechanical, marine, aerospace engineers and architects). The journal publishes research papers from a broad range of topics and approaches including structural mechanics, computational mechanics, engineering structures, architectural design, wind engineering, aerospace engineering, naval engineering, structural stability, structural dynamics, structural stability/reliability, experimental modeling and smart structures. Therefore, the Journal accepts both theoretical and applied contributions in all subfields of structural mechanics as long as they contribute in a broad sense to the core theme.