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作用于屋盖结构上的风压场具有明显的非高斯特性。针对这个特点,采用三次多项式表达风压过程和虚拟高斯过程之间的转换关系,推导出关于多项式所含参数的非线性方程组,利用高斯随机向量联合矩的特性获得相关函数的转换关系,从而建立了一种多变量平稳非高斯风压场的模拟方法。为了进一步提高计算效率和适应大型屋盖非线性风振响应分析的需要,将上述方法与本征正交分解法相结合,并采用B样条曲面插值技术,提出了屋盖结构非高斯风压场两步快速模拟的新方法。通过一个大跨度体育场屋盖的风压场计算,模拟了建议方法的计算过程。计算结果表明,建议方法模拟精度和计算效率较高,说明该方法应用于大型屋盖风压场计算的显著优势。
The wind pressure field acting on the roof structure has obvious non-Gaussian characteristics. In view of this characteristic, we use the conversion relations between the cubic polynomial expression and the virtual Gaussian process to deduce the nonlinear equations about the polynomial parameters, and obtain the transformation relation of the correlation function by using the characteristics of Gaussian random vector joint moments A multivariable non-Gaussian wind pressure field simulation method is established. In order to further improve the computational efficiency and meet the need of nonlinear wind-induced vibration response of large-scale roofs, the above method is combined with the method of eigen-orthogonal decomposition and the B-spline surface interpolation technique is adopted to propose the non- A new method of two-step fast simulation. Through the calculation of the wind pressure field of a long-span stadium roof, the calculation of the proposed method is simulated. The calculation results show that the simulation accuracy and calculation efficiency of the proposed method are high, which shows that the proposed method is applicable to the calculation of wind pressure field of large roofs.