一类准方形截面超高层建筑的顺风向气动阻尼

曹会兰;全涌;顾明

振动与冲击 ›› 2012, Vol. 31 ›› Issue (22) : 84-89.

PDF(2001 KB)
PDF(2001 KB)
振动与冲击 ›› 2012, Vol. 31 ›› Issue (22) : 84-89.
论文

一类准方形截面超高层建筑的顺风向气动阻尼

  • 曹会兰,全涌,顾明
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Along-wind aerodynamic damping of high-rise buildings with aerodynamically modified square cross-sections

  • Cao Huilan,Quan Yong, Gu Ming
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摘要

利用随机减量法从湍流风场下10个高层建筑气动弹性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,研究了方形截面超高层建筑的四个角沿不同尺寸的削角、凹角处理以及截面沿高收缩率对作用在建筑上的气动阻尼比的影响。研究结果发现:气动阻尼比随截面削角率、凹角率及截面沿高收缩率的增大而增大;较小的截面削角率和凹角率使顺风向气动阻尼比显著减小;但截面削角率、凹角率及截面沿高收缩率对超高层建筑气动效应的减小效应并非总是有效。基于方形截面超高层建筑顺风向气动阻尼特性研究,并结合截面修角及沿高收缩率的影响,给出相应的经验公式,供工程设计人员参考。

Abstract

Along-wind aerodynamic damping ratios are identified from wind-induced responses of ten aeroelastic models in a simulated turbulence flow 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 them, the effects of aerodynamically modified cross-sections, such as chamfered corner and slotted corner, and tapering on aerodynamic damping of square high-rise buildings are investigated. Results indicate that: aerodynamic damping ratio increases as corner-cut ratio or taper ratio increases; low corner-cut ratios significantly decrease aerodynamic damping; however, modifications of building corners and tapering are not always effective at reducing the aerodynamic damping of tall buildings. According to the study of aerodynamic damping of square high-rise buildings and combining with the effect of corner-cut and tapering, 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

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导出引用
曹会兰;全涌;顾明. 一类准方形截面超高层建筑的顺风向气动阻尼[J]. 振动与冲击, 2012, 31(22): 84-89
Cao Huilan;Quan Yong;Gu Ming. Along-wind aerodynamic damping of high-rise buildings with aerodynamically modified square cross-sections[J]. Journal of Vibration and Shock, 2012, 31(22): 84-89

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