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Numerical buckling analysis of large suction caissons for wind turbines on deep water
Highlights Buckling analysis of bucket foundation for offshore wind turbines using 3D FEA. Introducing imperfections decreased the buckling load for “small” imperfections. A large imperfection based solely on mode 1 can increase the buckling load. Including the first 21 mode shapes reduces the buckling pressure significantly. For large imperfections higher modes are generally more critical than lower modes.
Abstract Using large suction caissons for offshore wind turbines is an upcoming cost-effective technology also referred to as bucket foundations. During operation, the monopod bucket foundation is loaded by a large overturning moment from the wind turbine and the wave loads. However, during installation the suction caisson is loaded by external pressure (internal suction) due to evacuation of water inside the bucket and vertical forces due to gravity. The risk of structural buckling during installation of large-diameter suction caissons is addressed using numerical methods. Initial imperfect geometries are introduced, based on the buckling mode shapes from a linear eigenvalue buckling analysis. Different imperfect geometries are introduced to reveal how sensitive the buckling load is to these imperfections. Including the first 21 mode shapes as imperfect geometries will reduce the buckling pressure compared to only considering mode 1. The results of the finite element analysis are compared with current standards for evaluating buckling loads.
Numerical buckling analysis of large suction caissons for wind turbines on deep water
Highlights Buckling analysis of bucket foundation for offshore wind turbines using 3D FEA. Introducing imperfections decreased the buckling load for “small” imperfections. A large imperfection based solely on mode 1 can increase the buckling load. Including the first 21 mode shapes reduces the buckling pressure significantly. For large imperfections higher modes are generally more critical than lower modes.
Abstract Using large suction caissons for offshore wind turbines is an upcoming cost-effective technology also referred to as bucket foundations. During operation, the monopod bucket foundation is loaded by a large overturning moment from the wind turbine and the wave loads. However, during installation the suction caisson is loaded by external pressure (internal suction) due to evacuation of water inside the bucket and vertical forces due to gravity. The risk of structural buckling during installation of large-diameter suction caissons is addressed using numerical methods. Initial imperfect geometries are introduced, based on the buckling mode shapes from a linear eigenvalue buckling analysis. Different imperfect geometries are introduced to reveal how sensitive the buckling load is to these imperfections. Including the first 21 mode shapes as imperfect geometries will reduce the buckling pressure compared to only considering mode 1. The results of the finite element analysis are compared with current standards for evaluating buckling loads.
Numerical buckling analysis of large suction caissons for wind turbines on deep water
Madsen, S. (Autor:in) / Andersen, L.V. (Autor:in) / Ibsen, L.B. (Autor:in)
Engineering Structures ; 57 ; 443-452
27.09.2013
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Numerical buckling analysis of large suction caissons for wind turbines on deep water
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