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Structures and Safety Reliability

Ultimate Strength Analysis of Ship Hull Girder Under Random Material and Geometric Properties

[+] Author and Article Information
Suhas Vhanmane

Research and Rule Development Division, Indian Register of Shipping, Powai, Mumbai, Maharashtra 400 072, Indiasuhas.vhanmane@irclass.org

Baidurya Bhattacharya

Department of Civil Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721 302, Indiabaidurya@iitkgp.ac.in

J. Offshore Mech. Arct. Eng 133(3), 031602 (Mar 30, 2011) (8 pages) doi:10.1115/1.4002738 History: Received June 10, 2009; Revised September 27, 2010; Published March 30, 2011; Online March 30, 2011

The ultimate strength of a ship’s hull depends on its material and geometric properties, some or all of which may be random in nature. In addition, initial imperfections in the form of initial deflection and residual welding stresses in plating between stiffeners can significantly affect the hull ultimate strength. In this paper, the effect of randomness in yield strength and in the initial imperfections on ultimate hull girder strength is determined. Different levels of statistical dependence between yield strength and initial imperfection of stiffeners and plating between stiffeners have been considered. The methodology is applied on a bulk carrier and a VLCC tanker.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Stiffened plate element, combination of stiffener and attached plating

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Figure 2

Initial deflected shape of plating between the stiffeners

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Figure 3

Idealized welding residual stress distribution of plating between stiffeners

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Figure 4

Typical moment-curvature relationship of ship hull girder

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Figure 5

Midship section of tanker

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Figure 6

Midship section of bulk carrier

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Figure 7

Random yield strength (alone) for tanker-sagging (1000 cases, ρ=0.5)

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Figure 8

Random yield strength (alone) for tanker-hogging (1000 cases, ρ=0.5)

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Figure 9

Random yield strength (alone) for bulk carrier-sagging (1000 cases, ρ=0.5)

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Figure 10

Random yield strength (alone) for bulk carrier-hogging (1000 cases, ρ=0.5)

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Figure 11

Ultimate strength variation with correlation coefficient in tanker

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Figure 12

Ultimate strength variation with correlation coefficient in bulk carrier

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