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Research Papers

Analysis on the Hull Girder Ultimate Strength of a Bulk Carrier Using Simplified Method Based on an Incremental-Iterative Approach

[+] Author and Article Information
Özgür Özgüç

Det Norske Veritas AS, Offshore Classification South East Asia, 10 Science Park Drive, 118224 Singapore, Singaporeozgur.ozguc@dnv.com

N. D. Barltrop

Department of Naval Architecture and Marine Engineering, Universities of Glasgow and Strathclyde, Henry Dyer Building, 100 Montrose Street, Glasgow G4 0LZ, UKn.barltrop@na-me.ac.uk

J. Offshore Mech. Arct. Eng. 130(2), 021013 (Jun 09, 2008) (8 pages) doi:10.1115/1.2918305 History: Received October 02, 2006; Revised August 31, 2007; Published June 09, 2008

The hull girder ultimate strength of a typical bulk carrier is analyzed using a simplified method based on an incremental—iterative approach. First, vertical bending moment is examined by seven different methods. The moment versus curvature curves and the values of the ultimate longitudinal moments at collapse states are determined for both hogging and sagging cases. Second, the ultimate strength under coupled vertical and horizontal bending moment is accounted. An interaction curve is obtained, which corresponds to the results of series of calculation for the ship hull subject to bending conditions with different angles of curvature. It is found that the interaction curve is asymmetrical because the hull cross section is not symmetrical with respect to the horizontal axis and the structural response of the elements under compression is different from that under tension due to nonlinearity caused by buckling. The angles of the resultant bending moment vector and that of the curvature vector are different in investigated cases. The interaction design equations proposed by other researches are also addressed to discuss the results presented by this study.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Initial and at collapse position of the neutral axis under combined bending moment

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Figure 2

Cross section of a single side skin bulk carrier (14)

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Figure 3

Moment-curvature relationships for bulk carrier under only vertical bending component for hogging condition

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Figure 4

Moment-curvature relationships for bulk carrier under only vertical bending component for sagging condition

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Figure 5

Components of bending moment at θ=20deg in hogging condition

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Figure 6

The magnitude of the moment components with respect to the angle of curvature vector

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Figure 7

Relationship between angle of resultant bending moment and angle of curvature vector

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Figure 8

Interaction curves for bulk carrier under coupled bending moment for hogging condition, Rx and Ry indicate nondimensional vertical and horizontal bending moments’ ratio

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Figure 9

Interaction curves for bulk carrier under coupled bending moment for sagging condition

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