Structural analysis of aquaculture net cages in current |
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| Authors: | H Moe A Fredheim OS Hopperstad |
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| Institution: | 1. SINTEF Fisheries and Aquaculture, No-7465 Trondheim, Norway;2. Structural Impact Laboratory (SIMLab), Centre for Research-Based Innovation, Department of Structural Engineering, Norwegian University of Science and Technology (NTNU), No-7491 Trondheim, Norway;1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China;2. National Marine Hazard Mitigation Service, State Oceanic Administration, Beijing, 100000, China;1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;2. Marine Science and Technology School, Zhejiang Ocean University, Zhoushan 316000, China;1. SINTEF Fisheries and Aquaculture, 7465 Trondheim, Norway;2. Fiskeaaling, Aquaculture Research Station of the Faroes, Við Áir, FO-430 3 Hvalvík, Faroe Islands;1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;2. Marine Science and Technology School, Zhejiang Ocean University, Zhoushan 316000, China;1. Department of Marine Technology, Norwegian University of Science and Technology, NO-7491, Trondheim, Norway;2. Centre for Autonomous Marine Operations and Systems (AMOS), Norwegian University of Science and Technology, NO-7491, Trondheim, Norway;3. SINTEF Fisheries and Aquaculture, NO-7465, Trondheim, Norway |
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| Abstract: | A method for structural analysis of aquaculture net cages has been developed and verified for a netting solidity of 0.23, water current velocities from 0.1 to 0.5 m/s and relatively large deformations (volume reduction up to 70%) by comparing the numerical results to tests in a flume tank. Strength analysis was performed using commercial explicit finite element software to calculate distribution of loads in the net cage due to current, weights and gravity. The net cage was modelled using truss elements that represented several parallel twines. Sub-elements allowed the trusses to buckle in compression, and only negligible compressive forces were seen in the numerical results. Resulting drag loads and cage volume were shown to be dependent on the net cage size and weight system. Drag loads increased almost proportional to the current velocity for velocities in the range of 0.2–0.5 m/s, while the cage volume was reduced proportional to the current velocity. The calculated forces in ropes and netting of full-size net cages were well below the design capacity for current velocities up to 0.5 m/s. However, netting seams in the bottom panel of the net cage were identified as a potential problem area as the forces could reach the design capacity. |
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