文档介绍：南京航空航天大学硕士学位论文i摘要风荷载是作用在建筑结构上的重要动力荷载。由于获得现场实测多点脉动风速的数据非常困难,近年来许多学者借助计算机模拟技术来仿真脉动风速时程信号。本文主要通过计算分析传统单个脉动风速模拟方法的各自特点,选择并改进了其中一种方法来得到一种效率和精度都不错的模拟多个相关脉动风速的方法。本文对单个脉动风速情况下三种基于平稳高斯随机过程的方法自回归法(AR法)、逆傅立叶变换法(IDFT法)以及谐波叠加法(WAWS法),分别编制matlab程序进行了模拟,对比了脉动风速时程精度,模拟谱与目标谱的符合程度、能量分布以及自相关函数与目标函数的符合情况。结合分析得到的优缺点,选择谐波叠加法(WAWS法)进行多个点模拟的探讨,引入了信号处理中的抽取时间的快速离散傅立叶变换(DIT-FFT)来加速叠加的效率,得到了一种高效又不失精度的模拟方法。最后对一结构模型选取多点进行了空间多个相关脉动风速的模拟,编制matlab程序应用了该改进后的方法,验证了模拟谱与目标谱的符合程度,计算了效率提高的幅度。关健词:脉动风速,平稳高斯随机过程,自回归法,逆傅立叶变换法,谐波叠加法,抽取时间的快速离散傅立叶变换建筑结构风荷载的计算机模拟与分析iiABSTRACT The wind load is important dynamical load acting on the construction’s structure. Because to obtain the scene actual multi-spots pulsation wind speed the data is extremely difficult, many scholar attempt to simulate fluctuating wind speed time interval signal with the aid of puter simulation technology. Mainly by calculating and analyzing the characteristic of the tradition single fluctuating wind speed simulation methods,one method of them to be chosen and improved the efficiency and accuracy has been a good simulation method of a number of related fluctuating wind speed. For the three methods based on the steady Gauss stochastic process: autoregression method(AR method),inversed dispersed fourier transform method (IDFT method)and harmonic superposition method(WAWS method) under the situation of single fluctuating wind speed, the matlab procedure was programmed to simulate separately in this article, compared with the precision of time signal of the fluctuating wind speed,obtained the intensity of the accord with the simulated power spectrum and the goal spectrum, energy distribution as well as paration of the auto-correlation function and the goal function. Considering the advantages and disadvantages of the analysis results above, the WAWS method was chosen to discuss the correlated multi-point simulation, introduced the decimation in time fast fourier transform method(DIT-FFT) in the signal processing to accelerate the superimpositi