对现有规范中的不同结构设计方法进行梳理,在此基础上提出适用于不同形式海上风力发电支撑结构的基于整体二阶弹性分析的结构设计方法。对基于一阶弹性分析的压弯整体稳定验算公式进行修正,使其能适用于二阶弹性分析下等截面和变截面构件验算;根据支撑的强度和刚度要求介绍通过在支撑点处施加假想力来考虑导管架结构整体几何缺陷的方法。所提设计方法可与基于一阶弹性分析的传统设计方法保持协调过渡,能更好地考虑结构二阶效应,具有较强的工程应用可行性。
Abstract
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.
关键词
海上风电机组 /
支撑结构 /
稳定分析 /
一阶弹性分析 /
二阶弹性分析
Key words
offshore wind turbine /
support structure /
stability analysis /
first-order elastic analysis /
second-order elastic analysis
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参考文献
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基金
国家自然科学基金（51978528）; 华能集团科技项目“HNKJ23-H18海上风电场基础冲刷防护治理理论、措施及工程应用研究”
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