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Research Papers

Ultimate Limit State Assessment of the M.V. Derbyshire Hull Structure

[+] Author and Article Information
Jeom Kee Paik1

Department of Naval Architecture and Ocean Engineering, Pusan National University, 30 Jangjeon-Dong, Geumjeong-Gu, Busan 609-735, Koreajeompaik@pusan.ac.kr

Jung Kwan Seo, Bong Ju Kim

Department of Naval Architecture and Ocean Engineering, Pusan National University, 30 Jangjeon-Dong, Geumjeong-Gu, Busan 609-735, Korea

1

Corresponding author.

J. Offshore Mech. Arct. Eng 130(2), 021002 (Feb 28, 2008) (9 pages) doi:10.1115/1.2779332 History: Received October 18, 2006; Revised April 27, 2007; Published February 28, 2008

The Capesize bulk carrier, M.V. Derbyshire, sank in the North West Pacific during typhoon Orchid in September 1980 when she was on a voyage from Canada to Japan carrying fine iron ore concentrates. Since then, extensive investigations of the vessel sinking have previously been made in the literature primarily by the formal safety assessment technique to explore the loss causes, but serious speculation on the failure of hull structures has been lacking in such investigations. The present paper investigates the possibility of the vessel sinking initiated by the failure of hull structures rather than by other loss scenarios, such as hatch cover failure subsequent to water ingress into the cargo holds. Ultimate limit state assessments of individual stiffened panels and hulls of the M.V. Derbyshire under extreme bending moments during the last voyage in storm are made using ALPS/ULSAP and ALPS/HULL computer programs. It is concluded that the M.V. Derbyshire could have sunk by hull girder collapse with or even without unintended water ingress into cargo holds. Important insights and findings developed from the present study are summarized.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 4

A stiffened plate structure considered for ULS assessment by ALPS/ULSAP (5)

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Figure 5

ALPS/HULL sample modeling for a stiffened plate structure as an assembly of plate-stiffener separation units (left) or plate-stiffener combination units (right)

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Figure 1

Loss scenarios of bulk carriers, following Paik and Thayamballi (3)

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Figure 11

The vertical bending versus the bending curvature curve of the M.V. Derbyshire hull obtained by ALPS/HULL

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Figure 10

(a) Collapse mode distribution of individual components at ULS under sagging obtained by ALPS/HULL . (b) Collapse mode distribution of individual components at ULS under hogging obtained by ALPS/HULL .

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Figure 9

(a) von Mises stress distribution at ULS under sagging obtained by ALPS/HULL . (b) von Mises stress distribution at ULS under hogging obtained by ALPS/HULL .

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Figure 8

MAESTRO-ALPS/HULL model used for the progressive collapse analysis of the M.V. Derbyshire hull under vertical bending moment

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Figure 7

(a) Selected ULS assessment results of the M.V. Derbyshire hull structure under an extreme sagging condition in the storm using MAESTRO-ALPS/ULSAP . (b) Selected ULS assessment results of the M.V. Derbyshire hull structure under an extreme hogging condition in the storm using MAESTRO-ALPS/ULSAP (upside down).

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Figure 6

Three cargo hold model for a MAESTRO-ALPS/ULSAP ULS assessment of individual stiffened panels of the M.V. Derbyshire hull structure

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Figure 3

Last known loading condition of the M.V. Derbyshire (cargo centroids assume a level within the confines of hatchway opening with a 33deg angle of repose beyond hatch boundaries)

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Figure 2

Midship section drawing of the M.V. Derbyshire hull

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