A Computational Method for Analysis of LNG Vessels with Spherical Tanks

Kamsvag, F.; Steen, Eivind; Valsgard, S

doi:10.1016/s0928-2009(98)80144-3

Cited by 1 publication

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“…Finally, specific trimaran optimisation depends on measured data and assessment results. Valsgard et al [9] explored how significant torsion causes large diagonal shear deformations of the hatch openings, stress concentrations, and fatigue risk at the hatch corners from a structural perspective. Through theoretical and numerical investigations, Paik et al [10] examined the ultimate strength of the hull of a 4300 TEU container ship under combined vertical bending and torsion.…”

Section: Introductionmentioning

confidence: 99%

Linear Longitudinal Strength Analysis of a Multipurpose Cargo Ship under Combined Bending and Torsional Load

Abedin,

Franklin,

Mahmud

2023

JMSE

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Cargo ships with wide hatches usually have thin walls and limited torsional rigidity. Consequently, conducting a comprehensive torsional analysis is important because these loads can exert a significant impact. In this paper, the structural response of a multipurpose cargo ship to combined bending and torsional loads is studied using finite element analysis. The bending and torsional moments are calculated following the rules and standard regulations followed by the classification society. The ship’s 3D finite element model was verified using beam theory and direct calculations. In contrast, the accuracy of torsional stress was confirmed by comparing thin wall girder theory with direct calculation results. This study thoroughly examined the impacts of the still water bending moment, the vertical wave bending moment, and the wave-induced torsional moment on the structural response of ships. Furthermore, it scrutinised the impact of torsion on both open-deck and closed-deck ships. Hull girder normal stresses at midship due to still water and the vertical wave bending moment are shown to contribute to almost 70% of total stress in an inclined condition; stresses resulting from the horizontal wave bending moment contribute nearly 10%, while warping stresses contribute approximately 20% in open-deck ships. It is also shown that torsion has little impact on closed-deck ships. Finally, a buckling analysis was conducted to assess the ship’s buckling criteria, confirming that the linear buckling criteria were satisfied.

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Section: Introductionmentioning

confidence: 99%