考虑气弹效应的超大型冷却塔脉动风压非高斯特性研究  

Non-Gaussian features on fluctuating wind pressure for super large cooling towers with aero-elastic effect

作　　者：柯世堂[1] 夏逸鸣[1] 王法武[1] 唐敢[1] 

机构地区：[1]南京航空航天大学土木工程系,江苏南京210016

出　　处：《中南大学学报（自然科学版）》2013年第8期3302-3309,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51208254);江苏省自然科学基金资助项目(BK2012390);中国博士后科研基金资助项目(2013M530255);江苏省博士后科研基金(1202006B);南京航空航天大学科研专项(NN2012024;56YAH12010)

摘　　要：设计制作可同步测压测振的超大型冷却塔(高度为200 m)完备气弹模型,获取了考虑气弹效应的表面脉动风荷载,并对脉动风压的非高斯统计特性进行研究。基于测点脉动风压时程及其概率密度分布曲线,对具有非高斯分布特性的局部区域作出判断,再从风压信号的时间空间相关性入手,并结合中心极限定理讨论非高斯风压的形成机理,最后基于高阶矩的斜度及峰态值给出非高斯特征的区域划分和判别标准。Taking the super large cooling tower （H=200 m） as the example, based on modified equivalent beam-net design method, wind tunnel test of simultaneous pressure and vibration measurement for large cooling towers was carried out firstly. Wind pressure sample and histograms were employed to identify the local regions in which the wind pressure fluctuations exhibit non-Gaussian feature. The reason for non-Gaussian features in separated regions was discussed by combining the analysis of spatial correlation of wind pressure and the central limit theorem. The skewness and kurtosis of fluctuating wind pressures were employed to obtain a description of non-Gaussian features, and the criterions of non-Gaussian were proposed.

关 键 词：超大型冷却塔 气弹效应 非高斯特性 脉动风压 风洞试验 相关系数 

分 类 号：TU279.741[建筑科学—建筑设计及理论]