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Lookup NU author(s): Dr Do Kyun KimORCiD
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In this study, a comprehensive technical review on existing empirical formulations that predict the ultimate limit state (ULS) of a stiffened panelunder longitudinal compression was conducted. Recently, Kim et al. (2017) proposed a curve-fitting-based empirical formulation to predict the ultimate compressive strength of a stiffened panel. They found that the ULS behaviour of the stiffened panel fluctuated in the range of 0 < column slenderness ratio (λ) < 0.5. In this study, a detailed investigation on the lower range value of λ was conducted using ANSYS Nonlinear Finite Element Method (NLFEM)-based numerical simulation. A total of 10,500 cases were modelled using ANSYS numerical simulation by considering relevant size changes in plate thickness, web thickness, flange thickness, height of web, and breadth of flange. In the case of initial imperfection, only the average level of initial deflection to the plate and initial distortion to stiffener elements were considered, while the residual stressdue to welding was not considered. A detailed procedure including the selection of reliable scenarios, Finite Element (FE) modelling, FE analysis, and sensitivity analysis results, was also documented. The obtained outcome will be useful for understanding the ultimate compressive strength behaviour of a stiffened panel. Moreover, the applicability of existing empirical formulations can also be assessed from the statistical analysis results.In this study, a comprehensive technical review on existing empirical formulations that predict the ultimate limit state (ULS) of a stiffened panelunder longitudinal compression was conducted. Recently, Kim et al. (2017) proposed a curve-fitting-based empirical formulation to predict the ultimate compressive strength of a stiffened panel. They found that the ULS behaviour of the stiffened panel fluctuated in the range of 0 < column slenderness ratio (λ) < 0.5. In this study, a detailed investigation on the lower range value of λ was conducted using ANSYS Nonlinear Finite Element Method (NLFEM)-based numerical simulation. A total of 10,500 cases were modelled using ANSYS numerical simulation by considering relevant size changes in plate thickness, web thickness, flange thickness, height of web, and breadth of flange. In the case of initial imperfection, only the average level of initial deflection to the plate and initial distortion to stiffener elements were considered, while the residual stressdue to welding was not considered. A detailed procedure including the selection of reliable scenarios, Finite Element (FE) modelling, FE analysis, and sensitivity analysis results, was also documented. The obtained outcome will be useful for understanding the ultimate compressive strength behaviour of a stiffened panel. Moreover, the applicability of existing empirical formulations can also be assessed from the statistical analysis results.
Author(s): Kim DK, Lim HL, Yu SY
Publication type: Article
Publication status: Published
Journal: Ocean Engineering
Year: 2018
Volume: 170
Pages: 392-406
Print publication date: 15/12/2018
Online publication date: 02/11/2018
Acceptance date: 07/10/2018
ISSN (print): 0029-8018
Publisher: Elsevier
URL: https://doi.org/10.1016/j.oceaneng.2018.10.022
DOI: 10.1016/j.oceaneng.2018.10.022
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