Li, S; Paik, JK; Soares, CG; Georgiadis, D; Kim, DK; (2025) Plate-Stiffener Combination Modeling Effect on Ultimate Strength Reliability of Ship Hul Girders in Vertical Bending. In: Yang, J and Fu, J and Liu, A and Ng, CT, (eds.) Proceedings of the First International Conference on Engineering Structures. ICES 2024. (pp. pp. 1016-1026). Springer: Singapore.

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Abstract

The primary load components affecting ships and ship-shaped offshore installations are vertical bending, caused by uneven weight distribution, buoyancy, and dynamic wave forces. In extreme cases, excessive global bending can exceed a hull girder's ultimate strength, potentially leading to catastrophic failure, often referred to as “breaking of its back”. Simplified methods have been extensively researched to assess hull girder bending capacity, typically modeling them as assemblies of plate-stiffener combinations (PSC). While these models are straightforward and ensure accuracy for predominant vertical bending moments, uncertainties arise due to variations in PSC, as well as their stress-strain relationships or load-shortening curves. This paper focuses on quantifying modeling uncertainties inherent in PSC approaches when analyzing ultimate hull girder bending moments. It proposes an advanced method to mitigate these uncertainties, aiming to enhance accuracy and reliability in structural assessments. An illustrative example involving the hull structures of an ultra-large container ship demonstrates the effectiveness and applicability of the proposed approach.

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