摘要
通过37个超高层建筑气动弹性模型的风洞试验，利用随机减量法从模型的风致加速度响应中识别了气动阻尼，并通过与前人相关研究成果及基于准定常理论的计算结果的比较验证了识别结果的正确性。在此基础上，研究了独立矩形截面超高层建筑顺风向气动阻尼的变化规律，考察了质量密度比、广义刚度、结构阻尼比、高宽比、宽厚比及风场类型对建筑结构气动阻尼比的影响。研究结果表明：超高层建筑顺风向气动阻尼比随折减风速变化的曲线近似一条单调增加的直线；结构阻尼比、质量密度比、宽厚比、折减风速、高宽比是影响顺风气动阻尼的比较重要的参数；广义刚度、风场类型相对影响较小。基于这些研究数据，拟合了超高层建筑顺风向气动阻尼比的经验公式，供工程设计人员参考。
Abstract
Along-wind aerodynamic damping ratio is identified from wind-induced response of 37 aeroelastic models in a simulated turbulence wind environment using the random decrement technique (RDT). Their validity is examined through comparison with previous research achievements and the results evaluated by quasi-steady theory. Based on it, the characteristics of along-wind aerodynamic damping of isolated square high-rise buildings are studied. The effects of density ratio, generalized stiffness, structural damping ratio, aspect ratio, side ratio and terrain category on aerodynamic damping ratio of square high-rise buildings are investigated. Results indicate that: aerodynamic damping ratio increases monotonically with reduced wind velocity; structural damping ratio, density ratio, side ratio, reduced wind velocity and aspect ratio are very important parameters for along-wind aerodynamic damping, while no clear effect of generalized stiffness and terrain category on aerodynamic damping ratio is observed. According to the database, an empirical aerodynamic damping function for high-rise buildings is proposed.
关键词
超高层建筑 /
风致振动 /
气动阻尼 /
气动弹性模型 /
风洞试验
{{custom_keyword}} /
Key words
high-rise building /
wind-induced vibration /
aerodynamic damping /
aeroelastic model /
wind tunnel test
{{custom_keyword}} /
曹会兰;全涌;顾明;吴迪.
独立矩形截面超高层建筑的顺风向气动阻尼风洞试验研究[J]. 振动与冲击, 2012, 31(5): 122-127
Cao Hui-lan;Quan Yong;Gu Ming;Wu Di.
Along-wind aerodynamic damping of isolated square high-rise buildings[J]. Journal of Vibration and Shock, 2012, 31(5): 122-127
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}
PDF(2080 KB)
