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

Shen Li, Zhiqiang Hu, Simon Benson

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

6 Citations (Scopus)
1 Downloads (Pure)


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.

Original languageEnglish
Title of host publication30th International Ocean and Polar Engineering Conference
EditorsJin S. Chung, Odd M. Akselsen, Igor Buzin, HyunWoo Jin, Hiroyasu Kawai, Hua Liu, Dimitri Matskevitch, Bor-Feng Peng, Venkatachalam Sriram, Suak Ho Van, Decheng Wan, Satoru Yamaguchi
Place of PublicationCupertino, California
PublisherInternational Society of Offshore and Polar Engineers
Number of pages8
ISBN (Print)978-1-880653-84-5
Publication statusPublished - 11 Oct 2020
Event30th International Ocean and Polar Engineering Conference, ISOPE 2020 - Virtual, Online, China
Duration: 11 Oct 202016 Oct 2020

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
ISSN (Print)1098-6189
ISSN (Electronic)1555-1792


Conference30th International Ocean and Polar Engineering Conference, ISOPE 2020
CityVirtual, Online


  • buckling
  • cyclic loading
  • load-shortening curves
  • monotonic loading
  • sensitivity study
  • ship structures
  • ultimate strength


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