Ultimate strength of container ships subjected to combined hogging moment and bottom local loads,Part 2: An extension of Smith's method |
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| Institution: | 1. School of Naval Architecture and Ocean Engineering, Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE), Huazhong University of Science and Technology, Wuhan, China;2. School of Transportation, Wuhan University of Technology, Wuhan, Hubei Province, China;3. Centre for Marine Technology and Ocean Engineering (CENTEC), Instituto Superior Técnico, Universidade de Lisboa, Portugal;1. School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology, Wuhan, China;2. Collaborative Innovation Centre for Advanced Ship and Deep-Sea Exploration (CISSE), Wuhan, China;3. School of Transportation, Wuhan University of Technology, Wuhan, Hubei Province, China;1. Ocean and Ship Technology Research Group, Department of Civil and Environmental Engineering, Universiti Teknologi PETRONAS, Bandar, Seri Iskandar, Perak, Malaysia;2. Graduate School of Engineering Mastership, Pohang University of Science and Technology, Pohang, South Korea;3. Technip Asia Pacific, Kuala Lumpur, Malaysia;4. Steel Structure Research Group, Steel Solution Marketing Department, Steel Business Division, POSCO Global R&D Center, POSCO, Incheon, South Korea |
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| Abstract: | This paper is the second of two companion papers concerning the ultimate hull girder strength of container ships subjected to combined hogging moment and bottom local loads. The nonlinear finite element analysis in Part 1 has shown that local bending deformation of a double bottom due to bottom lateral loads significantly decreases the ultimate hogging strength of container ships. In this Part 2, extending Smith's method for pure bending collapse analysis of a ship's hull girder, a simplified method of progressive collapse analysis of ultimate hogging strength of container ships considering bottom local loads is developed. The double bottom is idealized as a plane grillage and the rest part of the cross section as a prismatic beam. An average stress-average strain relationship of plate/stiffened plate elements employed in Smith's method is transformed into an average stress-average plastic strain relationship, and implemented in the conventional beam finite element as a pseudo strain hardening/softening behaviors. The extended Smith's method is validated through a comparison with nonlinear finite element analysis. |
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| Keywords: | Ultimate hogging strength Double bottom bending Progressive collapse analysis Extended Smith's method Container ship |
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