A practical method for torsional strength assessment of container ship structures |
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| Institution: | 1. Jiangsu University of Science and Technology, Zhenjiang, China;2. DNV-GL, Oslo, Norway;3. Norwegian University of Science and Technology, Trondheim, Norway;1. Department of Naval Architecture and Ocean Engineering, INHA University, 100, Inha-ro, Nam-gu, Incheon, South Korea;2. Marine Structure Research Department, Hyundai Heavy Industries, Co., Ltd., 1000, Bangeojinsunhwan-doro, Dong-gu, Ulsan, South Korea;3. DSME R&D Institute, Daewoo Shipbuilding and Marine Engineering, Co., Ltd., 3370, Geoje-daero, Geoje-si, Gyeongsangnam-do, South Korea;4. Research Department, Marine & Offshore Division, Bureau Veritas, 92200, Neuilli sur Seine, France;1. School of Marine Science and Technology, Newcastle University, UK;2. Lloyds Register Asia, Technology Group, South Korea;1. Department of Naval Architecture, Shipbuilding and Ocean Engineering. Universidad Politécnica de Madrid (UPM), Madrid, Spain;2. Department of Material Science, Structural Materials Research Centre (CIME) Universidad Politécnica de Madrid (UPM), Madrid, Spain;1. MARIN, Maritime Research Institute, Wageningen, Netherlands |
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| Abstract: | Container ship structures are characterized by large hatch openings. Due to this structural property, they are subject to large diagonal deformations of hatch openings and warping stresses under complex torsional moments in waves. This necessitates torsional strength assessment of hull girder of container ships in their structural design stage. In this paper, a practical method for torsional strength assessment of container ship structures with transparent and consistent background is discussed based on the results from up-to-date analyses. In order to estimate the torsional response characteristics as accurately as possible, three-dimensional Rankine source method, after being validated by tank tests, is employed for estimation of wave loads on a container ship, and FE analyses are conducted on the entire-ship model under the estimated loads. Then, a dominant regular wave condition under which the torsional response of the container ship becomes maximum is specified. Design loads for torsional strength assessment that give torsional response equivalent to the long-term predicted values of torsional response are investigated based on the torsional moments on several container ships under the specified dominant wave condition. An appropriate combination of stress components to estimate the total hull girder stress is also discussed. |
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