With the increasing of structural height and subsoil flexibility of offshore wind turbine tower, the two-step structural design method based on the traditional first-order elastic analysis for the tower and foundation structures may no longer be safe and using global second-order elastic analysis should be more reasonable. In this paper, different structural design methods in the existing specifications are reviewed and the new design method based on global second-order elastic analysis is proposed for different types of offshore wind turbine structures. The checking formulas based on the first-order elastic analysis of global stability under the combined action of compression and bending moment is revised so that it can be applied to the calculation of uniform and variable cross-section members under the second-order elastic analysis. According to the requirements of strength and stiffness for bracing members, the method to consider the global geometric imperfections of jacket structures by applying a notional force at the support point is introduced. The new design method proposed in this paper can maintain a coordinated transition with the traditional design method based on the first-order elastic analysis. Moreover, the second-order effect of offshore wind turbine structures can be better considered. This method has strong engineering application feasibility and can provide reference for the design and optimization of offshore wind turbine structures.
Key words
offshore wind turbine /
support structure /
stability analysis /
first-order elastic analysis /
second-order elastic analysis
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References
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