Abstract
This research aims to study the ultimate limit state (ULS) behaviour of stiffened panel under longitudinal compression by a non-linear finite element method (NLFEM). There are different types of stiffeners mainly being used in shipbuilding, i.e., T-bar, flat-bar, and angle-bar. However, this research focuses on the ultimate compressive strength behaviour of flat-bar stiffened panel. A total of 420 reliable scenarios of flat-bar stiffened panel were selected for numerical simulation by the ANSYS NLFEM. The ultimate strength behaviours obtained were used as data for the development of closed form shape empirical formulation. Recently, our group proposed an advanced empirical formulation for T-bar stiffened panel, and the applicability of the proposed formulation to flat-bar stiffened panel is confirmed by this study. The accuracy of the empirical formulation obtained for flat-bar stiffened panel was validated by finite element (FE) simulation results of statistical analysis (R2 = 0.9435). The outcome obtained will be useful for ship structural designers in predicting the ultimate strength performance of flat-bar type stiffened panel under longitudinal compression.
Highlights
It is common for stiffened and unstiffened panels to be used for primary structural supporting members in the field of ocean and shore technology (OST), including shipping and offshore industries.In general, mild (MS24) and high tensile (AH32 or AH 36) steel grades are being used as construction materials for voyages in the Southern Sea Route (SSR)
It was verified that the obtained empirical formulation obtained the range of λ ≤ 2
The detailed comparisons were conducted by statistical analysis, as summarised was well fitted with ANSYS numerical simulation results (R2 = 0.9435)
Summary
It is common for stiffened and unstiffened panels to be used for primary structural supporting members in the field of ocean and shore technology (OST), including shipping and offshore industries. Mild (MS24) and high tensile (AH32 or AH 36) steel grades are being used as construction materials for voyages in the Southern Sea Route (SSR). In the case of the Northern Sea Route (NSR), which was opened due to the global warming effect, the different grades of the steels, i.e., B, D, E, or F, are recommended to be used [1,2,3]. The computational fluid dynamics (CFD)-based and fluid-structure interaction (FSI)-based numerical simulations are getting more and more popular in structural design, following the development of computer technology [4]
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