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Progressive collapse analysis of ship hull girders subjected to extreme cyclic bending
Affiliation:1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;2. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;1. School of Naval Architecture and Ocean Engineering, Huazhong University of Science&Technology, Wuhan, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE), Wuhan, China;3. School of Transportation, Wuhan University of Technology, Wuhan, Hubei Province, China;1. School of Marine Science and Technology, Newcastle University, UK;2. Lloyds Register Asia, Technology Group, South Korea
Abstract: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.
Keywords:Ultimate strength  Buckling  Longitudinal strength  Ship hull girder  Cyclic load  Progressive collapse
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