锥度化方形截面高层建筑的气动力特性

张正维; 全涌; 顾明; 熊勇

doi:10.3969/j.issn.0258-2724.2014.05.005

锥度化方形截面高层建筑的气动力特性

doi: 10.3969/j.issn.0258-2724.2014.05.005

张正维^1,2,
全涌¹,
顾明¹,
熊勇³

基金项目:

国家自然科学基金资助项目（50878159，90715040）

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- 文章访问数: 988
- HTML全文浏览量: 86
- PDF下载量: 600
- 被引次数: 0
出版历程
- 收稿日期: 2012-12-10
- 刊出日期: 2014-10-25

Aerodynamic Characteristics of Tapered Tall Buildings with Square Section

摘要

摘要: 用高频测力天平技术，对不同锥度比的方形截面高层建筑进行了风洞试验，分析了锥度比、湍流度和风向角对方形截面高层建筑基底弯（扭）矩系数、基底弯（扭）矩谱密度与基底弯（扭）矩间相关性的影响.试验结果表明：锥度化措施能减小方形截面高层建筑基底弯（扭）矩系数幅值25%以上，但不能改变基底气动力随风向角的变化规律；锥度化措施能减小所有折减频率范围内顺风向与扭转向基底弯矩谱，但只能减小低频区域横风向基底弯矩谱和谱峰高度，却增大旋涡脱落频率和高频区横风向基底弯矩谱；随来流湍流度增大，锥度化措施对风荷载的抑制效果减弱；折减频率在0.10到0.15时，锥度化措施能增大横风向基底弯矩与基底扭矩间的相关性.
- 高层建筑 /
- 锥度化措施 /
- 气动措施 /
- 高频测力天平 /
- 风洞试验
Abstract: Square tall buildings with different taper ratios were tested using the high frequency force balance (HFFB) technique in two different simulated wind fields. The effects of taper ratio, turbulence intensity and wind direction on aerodynamic base moment and torque coefficients, the power spectrum densities (PSD) of along- and across-wind base moments and torques, and the correlation between base moment and torque were analyzed systematically. The test results indicate that tapering of square tall buildings can reduce the amplitudes of the aerodynamic base moment and torque coefficients by 25% or more, but can not change the law of aerodynamic wind loads varying with wind directions. The tapering measure can reduce the PSDs of along-wind base moment and torque within all the reduced frequencies, but it can only reduce the spectral peak value of the PSD of across-wind base moment in low frequency region, and increase the frequency of the vortex shedding and the PSD value in high frequency region. With the turbulence intensity increasing, the effect of the tapering measure becomes weak. The coherence between across-wind base moment and torque is increased by the tapering measure when the reduced frequency is between 0.10 and 0.15.
- tall building /
- tapering measure /
- aerodynamic measure /
- high frequency force balance (HFFB) /
- wind tunnel test

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参考文献(20)

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文章访问数: 988
HTML全文浏览量: 86
PDF下载量: 600
被引次数: 0

锥度化方形截面高层建筑的气动力特性

doi: 10.3969/j.issn.0258-2724.2014.05.005

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出版历程

Aerodynamic Characteristics of Tapered Tall Buildings with Square Section

计量

出版历程

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