介绍了谐波合成法和本征正交分解法,然后通过平屋面风场本征正交分解与重构的研究,证实了利用B样条插值和风场重构方法扩展风场的有效性。在此基础上,首次提出了屋盖结构风场两步模拟方法。算例分析结果表明,该方法模拟精度高,而且计算效率也高。佛山世纪莲体育场屋盖风场模拟的算例说明该方法应用于大型屋盖抗风分析的显著优势。 The harmonic synthesis method and the eigen-orthogonal decomposition method are introduced. Then the eigen-orthogonal decomposition and reconstruction of the flat roof wind field are studied, and the validity of the wind field expansion using B-spline interpolation and wind field reconstruction is confirmed. On this basis, the two-step simulation method of roof wind field is proposed for the first time. The results of example analysis show that this method has high simulation accuracy and high computational efficiency. The example of wind field simulation of roof of Foshan Century Stadium shows that this method is applied to the significant advantages of wind-proof analysis of large roof.