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Evaluation of structural design of ultra large container vessel

The trend in modern sea transportation is building of ever larger container vessels, which require application of different numerical tools according to the relevant methodologies, in order to achieve their reliable structural design. The aim of this paper is to review direct strength assessment procedure based on long-term hydro- structure calculations including whipping and springing. As illustrative example, ultra large container ship with a capacity of 19000 TEU is selected and her structural design is evaluated both for fatigue and extreme response, respectively. Mathematical model is based on coupling of the 3D potential flow hydrodynamic model with the 3D FEM structural model. The general hydro-structure code HOMER, developed in Classification Society Bureau Veritas (BV) is used. Stress RAOs of selected structural details are obtained for full scatted diagram by the top- down procedure, and further used to assess their fatigue lives. Linear long term analysis is performed to define most contributing sea state to the vertical bending moment (VMB). Whipping response is computed on so called increased design sea state in time domain. Ultimate bending capacity was determined by nonlinear finite element analysis. Finally, extreme VBM is determined, and ultimate strength check according to the BV Rule Note NR583 was done.

container ship ; direct calculations ; hydroelasticity ; fatigue ; extreme response ; frequency domain ; time domain

This work was presented at the Annual Spring Meeting of The Society of Naval Architects of Korea (SNAK), organized by the Korean Association of Ocean Science and Technology Societies (KAOSTS), Busan (BEXCO), Korea, in May 2016. Also, some contributions are presented in earlier papers of the authors, which are properly cited within the manuscript and included in the reference list. The investigations have been done within the Joint Research Project (JRP) “A Study on Springing and Whipping of Hyundai SkyBench™ Container Carrier”. Authors are grateful to Quentin Derbanne and Maximilien Basquin from Bureau Veritas, Paris, for valuable discussions related to WhiSp methodology application. Also, the support of the Korean Government (MSIP) and National Research Foundation of Korea (NRF) through GCRC-SOP (Grant No. 2011-0030013) is greatly acknowledged.