Practical estimation methods of the design loads for primary structural members of tankers |
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| Institution: | 2. Department of Cardiology, Hirosaki University Graduate School of Medicine, Hirosaki 036-8562, Japan;3. Department of Hypertension and Stroke Medicine, Hirosaki University Graduate School of Medicine, Hirosaki 036-8562, Japan;4. Division of Cardiology, Saiseikai Kumamoto Hospital, Kumamoto 861-4193, Japan;1. Department of Physiology and Pathophysiology, Peking University Health Science Center, Beijing 100191, China;2. Collaborative Innovation Center of Tianjin for Medical Epigenetics and Department of Physiology and Pathophysiology, Tianjin Medical University, Tianjin 300070, China;3. Innovative Medicines & Early Development, AstraZeneca R&D, SE-431 83 Mölndal, Sweden;4. Department of Entomology and Nematology UC Davis Comprehensive Cancer Center, University of California, Davis, Davis, CA 95616, USA;1. Department of Cardiovascular Medicine, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan;2. Division of Regeneration and Medicine, Medical Center for Translational and Clinical Research, Hiroshima University Hospital, Hiroshima, Japan;3. Department of Gastroenterology and Metabolism, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan;4. Department of Biostatistics and Data Science, Osaka University Graduate School of Medicine, Osaka, Japan;5. Hiroshima International University, Hiroshima, Japan;6. Department of Cardiovascular Regeneration and Medicine, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan;7. Nagakubo Hospital, Tokyo, Japan;8. Department of Urology, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan;1. Department of Systems Innovation, Graduate School of Engineering, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan;2. Research into Artifacts, Centre for Engineering, University of Tokyo, 5-1-5, Kashiwano-ha, Kashiwa-shi, Chiba, Bunkyo-ku, Tokyo, Japan;3. Research Institute, Nippon Kaiji Kyokai, 3-3, Kioi-cho, Chiyoda-ku, Tokyo, Japan |
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| Abstract: | Various design loads used in the strength evaluation of ship structures have been introduced currently by classification societies. As most of these design loads have been determined as the standard loads for the sake of convenience, the relationships between the design loads and the sea states actually encountered by ships seem to be weak. Accordingly, it may be difficult to refer and utilize them as the fundamental design concepts for ship designers or the operational guidelines for ship operators. To overcome these difficulties, the authors have developed practical estimation methods of the design loads having transparent and consistent backgrounds to the actual loads acting on primary structural members of tankers. In this paper, the design sea states that closely resemble the actual sea states which are considered as the most severe for hull structures are firstly proposed. Secondly, the practical estimation methods of the design sea states are proposed by parametric studies using the results of series calculation of representative tankers. Thirdly, the practical estimation methods of design regular waves resulting in the same level of stresses with that induced in irregular waves under the design sea states are proposed. Finally, the practical estimation methods of the design loads such as ship motions, accelerations, hull girder bending moments and hydrodynamic pressures that are induced under design regular waves are proposed. |
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