Dynamics of steel offshore platforms under ship impact |
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| Institution: | 1. School of Civil and Resource Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;2. Department of Civil Engineering, Curtin University, Kent Street, Bentley, WA 6102, Australia;1. Technological University of Panama, School of Mechanical Engineering, Panama City, Panama;2. Osaka University, Joining and Welding Research Institute, Suita, Osaka, Japan;1. College of Materials Science and Engineering, Chongqing University, Sha Zheng Street 174, Sha Ping Ba District, Chongqing, China;2. School of Mechatronics Engineering, East China Jiaotong University, Nanchang, China;3. State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing, China;1. State Key Lab of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, China;2. State Key Lab of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian, China;3. ABS Global Performance Center, Singapore;4. CNOOC Research Institute, Beijing, China;1. School of Civil Engineering, Yantai University, Yantai 264005, China;2. College of Civil Engineering, Huaqiao University, Xiamen 361021, China;3. College of Civil Engineering, Hunan University, Changsha 410082, China |
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| Abstract: | This paper deals with the prediction of the dynamic response of steel offshore platforms to high energy impacts from typical supply vessels. The contribution of the high modes of a cantilever beam type structure with a concentrated top mass subjected to transverse impact from rigid and deformable strikers is analysed. A procedure to develop simplified equivalent systems for efficient structural response analysis is presented and its reliability tested by comparing the results from the explicit non-linear FE simulations. Effects such as the overall rotation of the installation, plastic deformations in the contact area, different impact locations and different hinge mechanisms are taken into account. It is shown that the use of the proposed equivalent systems with a reduced number of DOF's can provide accurate results at significantly less computational efforts as compared to the FE simulations. The derivation of some parameters of the equivalent dynamic elastic–plastic SDOF/2SDOF systems, however, needs to consider the complexity of the analysed steel frames and perform preliminary non-linear static analyses. Therefore, further studies of different impact scenarios on platforms with different configurations are recommended to augment the results presented here. |
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| Keywords: | Offshore steel platforms High-energy impact Ship collision Finite-element Equivalent dynamic systems |
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