[2016] A new method for assessing the shakedown limit state associated with the breakage of a ship's hull girder > Selected Papers

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[2016] A new method for assessing the shakedown limit state associated…

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Ships and Offshore Structures, Vol.11, No.1, pp.92-104, January 2016

A new method for assessing the shakedown limit state associated with the breakage of a ship's hull girder

Author(s): Xiaoming Zhang, Jeom Kee Paik and Norman Jones

Abstract:
Shakedown occurs when a structure responds steadily under cyclic loadings within appropriate limits after one or a few
cycles of loading. This study proposes a new method for assessing the shakedown limit state associated with the breakage
of a ship’s hull girder, considering the buckling effects seen under the cyclic hull girder actions of hogging and sagging
bending. The method is applied to a Suezmax-class double-hull oil tanker as an example. The shakedown limit state of the
ship under cyclic hull girder actions is analysed, and the results are compared with the ultimate hull girder strength of the
ship under monotonically applied hull girder loads. It is concluded that a ship’s hull under cyclic actions of vertical bending
can collapse, with a shakedown failure even if the vertical bending moments applied are smaller than the ultimate hull girder
strength determined under monotonically applied hull girder loads. The method and insights developed will be useful for
assessing hull girder breakage subject to cyclic hull girder bending moments.

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