中文摘要：

大型风电作业船桩腿拥有超长的特点，在复杂多变的波浪流载荷及船体共同作用下，其屈曲失稳现象将更为显著。文中探讨了桩腿屈曲稳定的理论依据及其数值分析算法，研究并对比了理论公式和数值分析这两种方法在工程适用性方面的差异，通过算例分析了影响桩腿稳定性的因素。研究结果表明：桩腿临界载荷的理论解超出数值解19．6％，理论公式在工程计算中显得更为保守，适用性不强；插销定位孔的直径的增大会降低桩腿的临界载荷；主板厚度的改变也会引起桩腿稳定性能的变化。因此在桩腿建造过程中，精确计算定位孔的开孔半径和主板厚度是十分必要的。

英文摘要：

The pile legs of super large wind turbine installation vessel are so long that their buckling behavior will become more obvious under a complex and volatile co-action of waves, flows and hull. The theoretical formula method and the numerical analysis al- gorithm for buckling stability of the pile legs are discussed and the differences in engi- neering applicability of these two methods are studied and compared. In addition, an ex- ample is presented to learn what factors are influencing the stability of the pile legs. The results indicate that the theoretical solution for the critical load of the pile legs is 19.6~ larger than the numerical solution, and that the theoretical formula method appears more conservative and inapplicable than the numerical analysis in engineering calcula tion. The increase in the radius of bolt location hole can decrease the critical load of the pile legs and the change in the thickness of main board can also influence the stability of the pile legs. Therefore, it is necessary to calculate precisely the radius of the bolt loca- tion hole and the thickness of the main board in constructing the pile legs.