高层建筑实测风场环境的非平稳性分析研究  

Non-stationary analysis on field measured wind speed data of tall buildings

作　　者：吴本刚[1,2] 吴玖荣[1,2] 傅继阳[1,2] 

机构地区：[1]广州大学-淡江大学工程结构灾害与控制联合研究中心,广州510006 [2]广州大学土木工程学院,广州510006

出　　处：《空气动力学学报》2014年第3期410-415,共6页Acta Aerodynamica Sinica

基　　金：国家自然科学基金(51378134);国家优秀青年基金(51222801);广东省自然科学基金重点项目(S2011030002800);广东省自然科学基金面上项目(S2012010009831)

摘　　要：首先采用应用较广泛的矢量分解法,对超高层结构西塔顶部的实测数据进行处理,总结了矢量分解法的三个方面的局限。然后针对这些局限且为获取较准确的脉动风速时程,考虑了风速非平稳特性,给出了获取螺旋桨风速仪的正交两方向的脉动风速时程的平稳模型与非平稳模型的数值表达公式。依据上述两种风速模型,进一步从湍流强度、阵风因子、概率密度分布和风速谱等指标进行对比分析,结果表明非平稳风速模型能更精确地描述高层建筑顶部实测风速数据的真实状态。The vector decomposition method was firstly adopted in this paper to process the measured wind speed data atop the super high-rise building Guangzhou West Tower.Three limitations of this widely used statistica analysis method in wind engineering were discussed.In order to solve these limitations and ob-taine more accurate fluctuating wind speed time history,the non-stationary characteristics of wind was taken into accoun in this study.Therefore a revised stationary and non-stationary （mainly induced from the EMD method）wind speed model were established respectively for the two orthogonal directions of the fluctuating wind speed obtained from the propeller anemometer.Then the four major indexes of wind characteristic for measured wind speed,i.e.the turbulence intensity,the gust factor,the probability density distribution,and the power spectral density of fluctuating wind speed,were discussed comprehensively by comparing the ana-lyzed results based on the specifications of the two above mentioned wind speed model.The comprehensive compared results showed that non-stationary wind speed model,which was obtained from the EMD method, could describe the true state of wind characteristic of on-site measured wind speed data more accurately.

关 键 词：非平稳风速模型 经验模态分解 矢量分解法 风场实测 超高层结构 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]