风场类型对方形超高层建筑顺风向气动阻尼的影响研究

曹会兰;全涌;顾明

振动与冲击 ›› 2012, Vol. 31 ›› Issue (16) : 22-26.

PDF(1765 KB)
PDF(1765 KB)
振动与冲击 ›› 2012, Vol. 31 ›› Issue (16) : 22-26.
论文

风场类型对方形超高层建筑顺风向气动阻尼的影响研究

  • 曹会兰,全涌,顾明
作者信息 +

Effect of Roughness Exposure on aerodynamic damping of square high-rise buildings

  • Cao Huilan, Quan Yong, Gu Ming
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摘要

摘要:通过8个典型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,研究了典型超高层建筑顺风向气动阻尼比的变化规律,考察了风场类型对建筑结构顺风向气动阻尼比的影响。研究结果表明:在I-IV类风场下,建筑结构的气动阻尼比随折减风速增长的速度渐缓;在V-VIII类风场下,风场对顺风向气动阻尼比的影响不是很显著。基于大量矩形截面超高层建筑顺风向气动阻尼特性研究,并结合风场类型的影响,给出相应的经验公式,供工程设计人员参考。

Abstract

Abstract: Aerodynamic damping ratio is identified from wind-induced response of 8 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 effect of roughness exposure on aerodynamic damping ratio of square high-rise buildings is investigated. Results indicate that: with roughness exposure of I-IV, aerodynamic damping ratio increases gradually slowly with reduced wind velocity, while no clear effect of roughness exposure on aerodynamic damping ratio is observed with roughness exposure of V to VIII. According to numerous studies of aerodynamic damping of rectangular high-rise buildings and combining with the effect of roughness exposure, 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

Key words

high-rise building / wind-induced vibration / aerodynamic damping / aeroelastic model / wind tunnel test

引用本文

导出引用
曹会兰;全涌;顾明. 风场类型对方形超高层建筑顺风向气动阻尼的影响研究[J]. 振动与冲击, 2012, 31(16): 22-26
Cao Huilan;Quan Yong;Gu Ming. Effect of Roughness Exposure on aerodynamic damping of square high-rise buildings[J]. Journal of Vibration and Shock, 2012, 31(16): 22-26

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