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Research Papers: Ocean Engineering

Ultimate Bearing Capacity Assessment of Hull Girder With Asymmetric Cross Section

[+] Author and Article Information
Chenfeng Li

College of Shipbuilding Engineering,
Harbin Engineering University,
No. 145, Nantong Street,
Nangang District,
Harbin 150001, Heilongjiang Province, China
e-mail: lichenfeng@hrbeu.edu.cn

Peng Fu

College of Shipbuilding Engineering,
Harbin Engineering University,
No. 145, Nantong Street,
Nangang District,
Harbin 150001, Heilongjiang Province, China
e-mail: fupeng@hrbeu.edu.cn

Huilong Ren

College of Shipbuilding Engineering,
Harbin Engineering University,
No. 145, Nantong Street,
Nangang District,
Harbin 150001, Heilongjiang Province, China
e-mail: renhuilong@263.net

Weijun Xu

College of Shipbuilding Engineering,
Harbin Engineering University,
No. 145, Nantong Street,
Nangang District,
Harbin 150001, Heilongjiang Province, China
e-mail: xuweijun@hrbeu.edu.cn

C. Guedes Soares

Fellow ASME
Centre for Marine Technology and
Ocean Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
No. 1, Av. Rovisco Pais,
Lisboa 1049-001, Portugal
e-mail: c.guedes.soares@centec.tecnico.ulisboa.pt

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received October 5, 2017; final manuscript received June 26, 2018; published online September 12, 2018. Assoc. Editor: Myung Hyun Kim.

J. Offshore Mech. Arct. Eng 140(6), 061103 (Sep 12, 2018) (9 pages) Paper No: OMAE-17-1180; doi: 10.1115/1.4040720 History: Received October 05, 2017; Revised June 26, 2018

The objective of this study is to investigate the variation of neutral axis of ship hull girder due to asymmetric geometry or asymmetric load, and its influence on the ultimate strength (ULS) of hull girder. In order to account for asymmetric geometries and loads of hull girders, the force equilibrium and force-vector equilibrium criteria together with a minimum convergence factors (error) method are employed to determine the translation and rotation of neutral axis plane (NAP) of symmetric or asymmetric hull cross section in the application of Smith's method at each step of curvature of the hull girder. The ULSs of Dow's 1/3 frigate model with three predefined structural integrity states, one intact and two damaged, respectively, is investigated by the improved Smith's method (ISM) for a range of variation of heeling angles. The influence of asymmetric geometry and load on the motion of NAP and on the ULS are analyzed and discussed. The results show that the improved iteration strategy together with the minimum convergence factors (error) method is efficient and more accurate in searching the translation and rotation of NAP. Finally, the envelope curves of the bending moments in the three predefined integrity states are obtained, which can be used for assessing ULS of hull girders under combined vertical and horizontal wave bending moments.

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Figures

Grahic Jump Location
Fig. 1

Neutral axis translation and rotation

Grahic Jump Location
Fig. 2

The force vector equilibrium condition

Grahic Jump Location
Fig. 3

Definition of heeling: (a) actual heeling condition and (b) heeling condition in the rotated frame

Grahic Jump Location
Fig. 4

Movement of neutral axis under each curvature: (a) the translation of neutral axis and (b) the rotation of neutral axis

Grahic Jump Location
Fig. 5

Half midship section of Dow's test hull-1/3 scale frigate

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Fig. 6

Comparison of bending moment-curvature relationships: (a) sagging condition and (b) hogging condition

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Fig. 7

Bending moment, motions of neutral axis-curvature relationships of Dow's 1/3 frigate model with heeling angle of 25deg: (a) sagging condition and (b) hogging condition

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Fig. 8

Bending moment, motions of neutral axis-curvature relationships in grounding condition: (a) 0deg, sagging, (b) 0deg, hogging, (c) 25deg, sagging, and (d) 25deg, hogging

Grahic Jump Location
Fig. 9

Bending moment, motions of neutral axis-curvature relationships in collision condition: (a) 0deg, sagging and (b) 0deg, hogging

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Fig. 10

Bending moments envelope curves in the three predefined integrity states

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