Residual Hull Girder Strength of Asymmetrically Damaged Ships

Fujikubo, Masahiko; Alie, Muhammad Zubair Muis; Takemura, Kentaro; Iijima, Kazuhiro; Oka, Saori

doi:10.2534/jjasnaoe.16.131

Cited by 12 publications

(20 citation statements)

References 8 publications

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“…In this case, the Smith method needs to be updated to include the progressively changing of the neutral axis rotations. Fujikubo et al (2012b) studied the influence of the neutral axis rotations on the damaged hull girders using the Smith's method, where they showed that the neutral axis rotations have a significant impact on the residual strength of asymmetrically damaged hulls which may reach as far as 8%. Joonmo et al (2012) adopted a different approach to deal with the translation and rotation of the neutral axis.…”

Section: Damaged Ship Structuresmentioning

confidence: 99%

Review of Ultimate Strength Assessment of Ageing and Damaged Ship Structures

Tekgoz

Garbatov

Soares

2020

J. Marine. Sci. Appl.

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The objective of this work is to provide an overview of the ultimate strength assessment of ageing and damaged ship structures in the last decades. Particular attention is paid to the ultimate strength of plates, stiffened panels, box girders, and entire ship hull structures subjected to corrosion degradation, fatigue cracking, and mechanical damage caused by accidental loading or impact. A discussion on the effect of the cyclic load on the plate rigidity, re-yielding, and ultimate load capacity on the ship hull girder is also part of the present study. Finally, some conclusions and discussions about potential future work are provided, identifying that more studies about the impact of corrosion degradation on the structural behaviour of the stiffened panels and the overall hull girders are needed. Studies related to the dynamic collapse behaviour of corroded and damaged ship structures under time-variant load also requires additional attention.

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Section: Damaged Ship Structuresmentioning

confidence: 99%

Review of Ultimate Strength Assessment of Ageing and Damaged Ship Structures

Tekgoz

Garbatov

Soares

2020

J. Marine. Sci. Appl.

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“…The ultimate strength analyses were carried out using the Smith method in Fujikubo et al (2012) and limited to vertical bending in the current study. It has proved to be a practical approach with satisfactory engineering accuracy and is therefore commonly accepted for assessment of the ultimate strength due to vertical and horizontal bending moments.…”

Section: Ultimate and Residual Strength Analysesmentioning

confidence: 99%

“…Figures 9 and 10 for intact conditions. Second, the Smith method in Fujikubo et al (2012) shall be applied in the cross-section where most of the structure's elements are removed because of the collision damage. This means that the shape of the damage opening and its location are important.…”

Section:  Damaged Conditionsmentioning

confidence: 99%

Reduction in ultimate strength capacity of corroded ships involved in collision accidents

Ringsberg

Johnson

et al. 2018

Ships and Offshore Structures

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The objective of the study is to investigate the effects of sudden damage, and progressive deterioration due to corrosion, on the ultimate strength of a ship which has been collided by another vessel. Explicit finite element analyses (FEA) of collision scenarios are presented where factors are varied systematically in a parametric study, e.g. the vessels involved in the collision, and consideration of corroded ship structure elements and their material characteristics in the model. The crashworthiness of the struck ships is quantified in terms of the shape and size of the damage opening in the side-shell structure, and the division of energy absorption between the striking and struck ships for the different collision simulations. The ultimate strength of the struck ship is calculated using the Smith method and the shape and size of the damage openings from the FEA. In conclusion, the study contributes to understanding of how corroded, collision-damaged ship structures suffer significantly from a reduction in crashworthiness and ultimate strength, how this should be considered and modelled using the finite element method and analysed further using the Smith method.

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“…In the case of an asymmetric stress-strain, the neutral axis does not only translate, but also rotate. Fujikubo et al [13] found that the influence of the rotation of the neutral axis on the accuracy of residual strength may be as large as 8%. In order to account for the rotation, Joonmo et al [14] proposed a force vector equilibrium method where both the force and moment at the cross-section are in equilibrium.…”

Section: Introductionmentioning

confidence: 99%

Ultimate Limit State Function and Its Fitting Method of Damaged Ship under Combined Loads

Zhu

Ren

et al. 2020

JMSE

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The ultimate limit state function is one of the premises for the assessment of structure strength and the safety of ships under severe conditions. In order to study the residual strength of damaged ships under the combined load of vertical and horizontal bending moments acting on the hull girder, the ultimate limit state function of a damaged ship under combined load, and its fitting methods are investigated in this paper. An improved Smith Method is adopted to calculate the residual load carrying capacity of damage ships, where the rotation and translation of the neutral axis of the damaged cross-section are obtained using a particle swarm optimisation method. Because the distribution curve of the residual load carrying capacity of a damaged ship under combined load is asymmetric, the application of traditional explicit polynomial fitting methods results in poor accuracy. In this study, a piecewise weighted least square fitting method is adopted so as to guarantee the continuity in the transitions, and a method is proposed for fitting the ultimate limit state function of a damaged ship under combined load. Calculations of the residual strength show that the improved Smith Method is more accurate than the original Smith Method for the accurate position of the neutral axis. The error analysis of the fitting methods shows that the ultimate limit state function that is fitted using a piecewise weight least square method is more accurate.

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Residual Hull Girder Strength of Asymmetrically Damaged Ships

Cited by 12 publications

References 8 publications

Review of Ultimate Strength Assessment of Ageing and Damaged Ship Structures

Review of Ultimate Strength Assessment of Ageing and Damaged Ship Structures

Reduction in ultimate strength capacity of corroded ships involved in collision accidents

Ultimate Limit State Function and Its Fitting Method of Damaged Ship under Combined Loads

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