International Journal of Naval Architecture and Ocean Engineering

The Society of Naval Architects of Korea (대한조선학회)
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A new procedure for load-shortening and -elongation data for progressive collapse method

  • Downes, Jonathan (Fluid Structure Interactions Group, Faculty of Engineering and the Environment, University of Southampton) ;
  • Tayyar, Gokhan Tansel (Department of Naval Architecture and Marine Engineering, Istanbul Technical University) ;
  • Kvan, Illia (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Choung, Joonmo (Department of Naval Architecture and Ocean Engineering, Inha University)
  • Received : 2016.07.27
  • Accepted : 2016.10.19
  • Published : 2017.11.30
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Abstract

Progressive Collapse Method (PCM) has been broadly applied to predict moment-carrying capacity of a hull girder, however accuracy of PCM has not been much studied. Accuracy of PCM is known to be dependent on how Load-Shortening and -Elongation (LSE) curve of a structural units are well predicted. This paper presents a new procedure to determine LSE datum based on box girder Finite Element Analyses (FEAs) instead of using finite element model of stiffened panels. To verify reliability of FEA results, the simple box girder collapse test results are compared with FEA results of same box girders. It reveals one frame-based box girder model is sufficiently accurate in terms of ultimate strengths of the box girders. After extracting LSE data from the box girders, PCM-based moment-carrying capacities are compared with those from FEAs of the box girders. PCM results are found to be equivalent to FEAs in terms of moment-carrying capacity if accurate LSE data are secured. The new procedure is applied to well-known 1/3 scaled frigate full section. Very excellent moment-carrying capacity of frigate hull section is obtained from PCM with LSE data from box girder FEAs.

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References

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