摘要
结合CFD数值方法和风洞试验分析了高层建筑顶部横梁的气动力和风荷载特性。CFD数值结果显示建筑顶部绕流会显著增大横梁处的气流风攻角;横梁气动力的数值计算结果和风洞试验结果均证实横梁为驰振稳定截面;风振分析显示横梁的峰值升力大于峰值阻力,通过进一步分析广义力功率谱密度函数和频率比对峰值升力的影响,证实横梁在50年重现期强风作用下处于涡激共振状态。
The characteristics of aerodynamic force and wind load of a horizontal beam located at a tall building＇s top were analyzed with CFD numerical simulation and wind tunnel tests. The results of CFD numerical simulation showed that the wind attack angle of the horizontal beam increases significantly due to the effect of air flow around the building top. Both the results of the beam＇s aerodynamic force obtained from numerical simulation and those gained from wind tunnel tests showed that the beam has a stable cross section for galloping. The wind-induced response analysis of the beam revealed that its peak lift is greater than its peak drag. Analyzing the power spectral density function of generalized force and the influence of frequency ratio on peak lift was further conducted. It was shown that the horizontal beam has vortexinduced resonances under the strong wind with 50-year return period.
出处
《振动与冲击》
EI
CSCD
北大核心
2016年第5期103-107,152,共6页
Journal of Vibration and Shock
基金
国家自然科学基金(51208213)
华南理工大学亚热带建筑科学国家重点实验室开放基金(2013KB26)
中央高校基本科研业务费专项资金(2015ZZ018)
关键词
高层建筑
横梁
风洞试验
数值模拟
气动力
涡激共振
high-rise buildings
horizontal beam
wind tunnel test
numerical simulation
aerodynamic force
vortex-induced resonance
