Progressive collapse analysis of ship hull girders subjected to extreme cyclic bending

Shen Li, Zhiqiang Hu, Simon Benson

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13 Citations (Scopus)
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This paper introduces a novel analytical method to predict the buckling collapse behaviour of a ship hull girder subjected to several cycles of extreme load. This follows the general principles of the established simplified progressive collapse method with an extended capability to re-formulate the load-shortening curve of structural components to account for cyclic degradation. The method provides a framework for assessing residual hull girder strength following a complex series of unusually extreme load events where the wave induced bending moment rises close to, or even surpasses, the monotonic ultimate strength. These load events may be sequential, such as might be caused by a series of storm waves, or they may occur as a collection of discrete events occurring over a longer period. The extreme cyclic bending amplifies the distortion and residual stress initially induced by fabrication in the flanges of the girder, which results in a deterioration of the residual ultimate strength. Validation is firstly completed through a comparison with previously published experimental work and secondly via comparison with numerical simulation on four ship-type box girders using the nonlinear finite element method.

Original languageEnglish
Article number102803
Number of pages34
JournalMarine Structures
Early online date2 Jul 2020
Publication statusPublished - 30 Sep 2020


  • buckling
  • cyclic load
  • longitudinal strength
  • progressive collapse
  • ship hull girder
  • ultimate strength


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