湍流特性对圆形高层建筑风荷载的影响研究  

Influence of turbulence characteristics on wind load of circular high-rise buildings

作　　者：李永贵[1,2] 全嘉 李毅[1,2] 严佳慧 胡阳 LI Yonggui;QUAN Jia;LI Yi;YAN Jiahui;HU Yang(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201 [2]湖南科技大学结构抗风与振动控制湖南省重点实验室,湖南湘潭411201

出　　处：《自然灾害学报》2023年第5期149-156,共8页Journal of Natural Disasters

基　　金：国家自然科学基金项目(51878271);湖南省自然科学基金项目(2020JJ4302,2020JJ5176)。

摘　　要：在四类不同湍流特性的风场和均匀风场中对圆形高层建筑模型进行同步测压试验,分析了模型表面风压系数、层风力系数及其功率谱、基底力矩系数及其功率谱的变化规律。结果表明:相比基准C类风场,湍流强度增大使得脉动风压系数明显增大,平均阻力系数减小,横风向脉动基底弯矩系数增大;随着湍流积分尺度的减小,背风面平均风压系数和脉动风压系数的绝对值均减小,CL2风场结果的减小值更为明显;层风力系数随湍流积分尺度减小而减小,湍流积分尺度的变化对层脉动升力系数和横风向脉动基底弯矩系数的影响可以忽略;湍流特性对基底力矩功率谱和顺风向层风力功率谱影响不大;随着湍流积分尺度的减小,横风向层风力功率谱谱峰对应的折减频率不断增大。In four types of wind fields with different turbulent characteristics and a uniform wind field,pressure measurement tests of circular high-rise building model was carried out,variation rules of surface wind pressure coefficient,layer wind coefficient and its power spectrum,base moment coefficient and its power spectrum of model were analyzed.The results show that compared with the reference type C wind field,with the increase of turbulence,the fluctuating wind pressure coefficient increases obviously,the average drag coefficient decreases,and the crosswind fluctuating bending moment coefficient increases.With the decrease of turbulence integral scale,the absolute value of leeward mean wind pressure coefficient and fluctuating wind pressure coefficient both decrease,and the decrase value of the CL2 wind field is more obvious.The layer wind force coefficient decreases with the decrease of the turbulence integral scale,and the influence of the turbulence integral scale on the layer lift coefficient and the base bending moment coefficient of the crosswind fluctuation can be ignored.The turbulence characteristics have little effect on the base moment power spectrum and the wind power spectrum of the alongwind layer.With the decrease of the turbulence integral scale,the reduction frequency corresponding to the peak of the wind power spectrum of the crosswind layer continues to increase.

关 键 词：高层建筑 圆形 风洞试验 湍流度 湍流积分尺度 

分 类 号：TU973[建筑科学—结构工程]