吴海洋, 梁枢果, 陈政清, 彭晓辉. 强风下方截面高层建筑横风向气动阻尼比研究[J]. 工程力学, 2010, 27(10): 96-103.
引用本文: 吴海洋, 梁枢果, 陈政清, 彭晓辉. 强风下方截面高层建筑横风向气动阻尼比研究[J]. 工程力学, 2010, 27(10): 96-103.
WU Hai-yang, LIANG Shu-guo, CHEN Zheng-qing. RESEARCH ON THE AERODYNAMIC DAMPING RATIOS OF SQUARE TALL BUILDINGS IN ACROSS -WIND DIRECTION UNDER STRONG WIND[J]. Engineering Mechanics, 2010, 27(10): 96-103.
Citation: WU Hai-yang, LIANG Shu-guo, CHEN Zheng-qing. RESEARCH ON THE AERODYNAMIC DAMPING RATIOS OF SQUARE TALL BUILDINGS IN ACROSS -WIND DIRECTION UNDER STRONG WIND[J]. Engineering Mechanics, 2010, 27(10): 96-103.

强风下方截面高层建筑横风向气动阻尼比研究

RESEARCH ON THE AERODYNAMIC DAMPING RATIOS OF SQUARE TALL BUILDINGS IN ACROSS -WIND DIRECTION UNDER STRONG WIND

  • 摘要: 该文设计了一种质量和结构阻尼比可调的底部弹性支撑刚性体的双向摆式气弹模型,并通过气弹模型风洞试验获得模型顶部加速度响应时程。运用改进的随机减量技术,识别了湍流场中强风下方截面高层建筑横风向气动阻尼比。分析了风场类别、结构阻尼比、均匀当量质量以及模型高宽比对横风向气动阻尼比随折算风速变化规律的影响。最后提出了横风向气动阻尼比的经验公式,并将引入气动阻尼比后的横风向响应计算值与气弹模型风洞试验测量值比较,证明了该气动阻尼比经验公式的正确性和实用性。

     

    Abstract: A rigid body base pivoted aero-elastic model is designed with adjustable mass and damping ratio, which can sway in two perpendicular directions. The acceleration history response of the top of the model is acquired from aero-elastic model wind tunnel test. The aerodynamic damping ratios of square tall buildings in across-wind direction in turbulent flow field are evaluated by the improved random decrement technique. The laws of across-wind aerodynamic damping ratios changing with reduced velocities is discussed, which is affected by terrain categories, structural damping ratios, uniform equivalent masses and aspect ratios. Ultimately, the empirical formulas of across-wind aerodynamic damping ratios are proposed, which are proved to be correct and practical by comparing the calculated across-wind responses considering aerodynamic damping ratios with wind tunnel tests results.

     

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