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介绍了风力机塔筒在多荷载联合作用下临界屈曲荷载的工程算法与有限元分析方法,并以某5 MW风力机塔筒为研究对象,对比分析不同方法得到的临界屈曲荷载。计算结果表明,线性屈曲分析由于未考虑非线性因素的影响,得到的临界屈曲荷载偏大,而非线性屈曲分析与工程算法得到的计算结果相近。根据计算结果得出,相关标准提出的工程算法存在一定的局限性,在实际验算中需采用有限元方法进行辅助分析,同时提出一种考虑初始缺陷的非线性屈曲分析方法。
The engineering algorithm and finite element analysis method for the critical buckling load of wind turbine tower under multiple loads are introduced. The critical buckling load obtained by different methods is contrasted and analyzed with a 5 MW wind turbine tower. The calculated results show that the critical buckling load obtained by the linear buckling analysis is larger than that without the nonlinear factors, while the nonlinear buckling analysis is similar to the engineering one. According to the calculation results, the engineering standards proposed by the relevant standards have some limitations. In the actual checking, the finite element method is used to assist the analysis. At the same time, a nonlinear buckling analysis method considering the initial defects is proposed.