基于随机Fourier谱的风场仿真  

Simulation of Wind Field Based on Stochastic Fourier Spectrum

作　　者：张琳琳[1] 李杰[1] 

机构地区：[1]同济大学建筑工程系,上海200092

出　　处：《同济大学学报（自然科学版）》2006年第9期1142-1146,1158,共6页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金委优秀创新研究群体科学基金资助项目(50321803)

摘　　要：研究了由随机Fourier谱生成具有特定场地风荷载统计特性的样本函数的问题.首先对随机风场模型进行了描述,然后利用谐波合成的方法,在对互随机Fourier谱矩阵进行Cholesky分解的基础上,通过一组余弦函数的和对随机脉动风速场进行了模拟.最后,结合一20层平面框架结构纵向风速场的仿真问题进行了数值仿真研究.算例表明,所提算法可以准确地模拟给定场地特性的脉动风速时程.Research was made on generating sample functions with prescribed statistic characteristics of wind loads at a given site. First, the random wind field model was described. Then based on the har- monic-wave superposition method, the random turbulent wind speed field was simulated by superposing a set of cosine functions after the cross stochastic Fourier spectrum matrix was decomposed with Cholesky＇ s method. Finally, an example involving simulation of longitudinal turbulent wind field of a 20-story plane frame structure was investigated. The result shows that the proposed algorithm is of accuracy.

关 键 词：风场仿真 随机FOURIER谱 谐波合成 脉动风速 

分 类 号：TU973.32[建筑科学—结构工程]