风荷载的模拟研究

本文叙述了一种有效而实用的顺风向风荷载模拟方法，利用互谱密度函数矩阵的分解，考虑了随高度变化的风谱，由不对称互相关函数引起的包括共谱和重谱的风互功率谱以及与频率有关的相位关系。通过一组余弦函数的和对随机形式的脉动风进行了模拟。文中模拟计算结果与实测结果进行了比较分析，模拟风能较好地满足自然风的基本特性。

Simulation of Wind Loading

Based on the decomposition of cross-spectral density matrix, an efficient and practical method of wind loading simulation in along wind direction is presented. For the simulation, the following important wind properties (according to measurements ) are taken into account: the auto-spectrum varying with the height; the simultaneous inclusion of the co-and quadrature spectrum, the maximum of cross correlation function shifts to negative value of time and phase lag which is dependent on frequency etc. Finally,as an example, with the same parameters as those obtained from measurement, the wind velocity on different height levels are simulated and the results are discussed. Compared with the measurements, the simulated values agree fairly well with the measured results.