Evaluation of ultimate strength of stiffened panels under longitudinal thrust |
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| Institution: | 1. Graduate School of Engineering, Hiroshima University, Higashi-hiroshima 739-8527, Japan;2. Graduate School of Science and Engineering, Ehime University, Japan;3. Nippon Kaiji Kyokai, Japan;4. Graduate School of Engineering, Osaka University, Japan;5. Tsuneishi Shipbuilding Company Ltd., Japan;1. Ocean Engineering Department, COPPE, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil;2. Centre for Marine Technology and Ocean Engineering (CENTEC), Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal;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;1. School of Marine Science and Technology, Newcastle University, UK;2. Fluid Structure Interactions, Engineering and the Environment, University of Southampton, UK;1. Ocean and Ship Technology Research Group, Department of Civil and Environmental Engineering, Universiti Teknologi PETRONAS, Seri Iskandar, Perak, Malaysia;2. Graduate Institute of Ferrous Technology, POSTECH, Pohang, South Korea;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 |
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| Abstract: | A series of collapse analyses is performed applying nonlinear FEM on stiffened panels subjected to longitudinal thrust. MSC.Marc is used. Numbers, types and sizes of stiffeners are varied and so slenderness ratio as well as aspect ratio of local panels partitioned by stiffeners keeping the spacing between adjacent longitudinal stiffeners the same. Initial deflection of a thin-horse mode is imposed on local panels and that of flexural buckling and tripping modes on stiffeners to represent actual initial deflection in stiffened panels in ship structures. On the basis of the calculated results, buckling/plastic collapse behaviour of stiffened panels under longitudinal thrust is investigated. The calculated ultimate strength are compared with those obtained by applying several existing methods such as CSR for bulk carriers and PULS. Simple formulas for stiffened panels, of which collapse is dominated fundamentally by the collapse of local panels between longitudinal stiffeners, are also examined if they accurately estimate the ultimate strength. Through comparison of the estimated results with the FEM results, it has been concluded that PULS and modified FYH formulas fundamentally give good estimation of the ultimate strength of stiffened panels under longitudinal thrust. |
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| Keywords: | Stiffened panels Longitudinal thrust Buckling/plastic collapse Ultimate strength Nonlinear FEM analyses Simple formulas CSR-B PULS |
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