The sensitivity of ultimate ship hull strength to the structural component load-shortening curve

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Li, Shen and Hu, Zhiqiang and Benson, Simon; Chung, Jin S. and Akselsen, Odd M. and Buzin, Igor and Jin, HyunWoo and Kawai, Hiroyasu and Liu, Hua and Matskevitch, Dimitri and Peng, Bor-Feng and Sriram, Venkatachalam and Van, Suak Ho and Wan, Decheng and Yamaguchi, Satoru, eds. (2020) The sensitivity of ultimate ship hull strength to the structural component load-shortening curve. In: 30th International Ocean and Polar Engineering Conference. Proceedings of the International Offshore and Polar Engineering Conference . International Society of Offshore and Polar Engineers, CHN, pp. 3237-3244. ISBN 978-1-880653-84-5

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Abstract

The prediction of ultimate ship hull strength using a simplified progressive collapse method critically relies on the evaluation of the load-shortening curve of stiffened panel components. Uncertainty in the characteristics of load-shortening curves causes subsequent uncertainty in the hull girder strength calculation. The load-shortening curve shape is influenced by parameters including imperfection, residual stress, material properties and dimensional variance. To investigate this uncertainty, a sensitivity study on the ultimate strength calculation of a ship-type box girder is completed using parametrically defined load-shortening curve. The curve is formed of linear pre-and post-collapse responses and an arc to represent the nonlinear ultimate strength region. The load-shortening curve is systematically varied in ultimate strength, ultimate strain, elastic stiffness and post-collapse stiffness. A double hull box girder model under vertical bending, combined vertical/horizontal bending and cyclic bending is analysed using this parametric representation. The influence of each parameter is evaluated with a sensitivity index. The study shows that the structural component’s ultimate strength and post-collapse stiffness have the most significant influence.

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