摘要
强/台风的湍流特性往往变化较大,现有关于湍流特性对高层建筑风力特性影响的研究大多忽略了湍流积分尺度,只考虑了湍流强度的变化。本文基于方形高层建筑模型测压试验,研究了湍流积分尺度和湍流强度对高层建筑模型风力系数、功率谱和相关性的影响。结果表明:随着湍流强度的增大,层平均、脉动阻力和脉动升力系数增大;横风向层脉动风力功率谱的峰值和斯托罗哈数呈减小趋势;层脉动风力相关性增强;顺风向、扭转向脉动基底力矩系数明显增大;基底力矩功率谱变化规律与相应的层脉动风力类似。随着湍流积分尺度减小,层阻力系数明显减小;顺风向基底弯矩系数逐渐减小;顺风向、横风向层风力相关性减弱;层脉动风力功率谱变化不明显。
Wind load is one of the controlling loads for structure design of tall buildings.The turbulence characteristics have a great influence on the surface distribution of wind load.A square-tall building model with four different turbulence characteristics has been tested by the synchronous multipressure sensing system.The effect of turbulence characteristics on wind force including layer wind coefficient,base moment coefficient,power spectral density,and correlation of the fluctuating wind forces were investigated.The results show that wind force characteristics depend on both turbulence integral scale and intensity.With the increase of turbulent intensity,the layer resistance and lift wind coefficient increase;the peak values of the power spectra in cross-wind and the corresponding Stokes numbers decrease;the correlation of layer fluctuating wind is enhanced;the base moment coefficient in along and torsion-wind increase significantly.The turbulent intensity effects on frequency domain characteristics are similar between the fluctuating base moments and corresponding fluctuating local wind force.As the turbulence integral scale decreases,the layer resistance coefficient is significantly reduced.The base moment coefficient in along-wind decreases gradually.The correlation of force in along-wind and across-wind is weakened,and the layer fluctuating wind power spectrum is not obvious.
作者
严佳慧
李永贵
李毅
全嘉
胡阳
YAN Jiahui;LI Yonggui;LI Yi;QUAN Jia;HU Yang(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 41120l,Hunan,China;Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control,Hunan University of Science and Technology,Xiangtan 411201,Hunan,China)
出处
《实验力学》
CSCD
北大核心
2023年第2期276-284,共9页
Journal of Experimental Mechanics
基金
国家自然科学基金(51878271)
湖南省自然科学基金(2020JJ4302,2020JJ5176)资助。
关键词
风洞试验
高层建筑
湍流强度
湍流积分尺度
风力系数
wind tunnel tests
tall building model
turbulent intensity
turbulence integral scale
wind force coefficients
