不同风向角下干扰效应对超高层建筑横风向风振响应影响的试验研究

Experimental Study on the Influence of Interference Effect on Transverse Wind Vibration Response of Super Tall Buildings Under Different Wind Direction Angles

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摘要通过气弹模型测振试验,分析了2个相同尺寸的建筑模型,在折减风速、风向角和施扰位置改变的情况下,受扰建筑顶部横风向加速度响应的变化情况。绘制了加速度响应均方根的干扰因子IF和全风速情况下的包络干扰因子EIF等值线图,讨论建筑在不同情况下受到的干扰效应,并进行了典型工况的时频分析。结果表明,两建筑串列布置且施扰建筑位于y/b=6时,建筑横风向加速度响应均方根达到最大值;两建筑并列布置且施扰建筑位于x/b=2时,建筑横风向加速度响应均方根减小最为明显;随着风向角的增加建筑横风向加速度响应均方根有所减小;施扰建筑位于上游对受扰建筑风振响应的影响较为强烈,普遍会放大受扰建筑的风振响应;不同风向角各施扰位置受扰建筑的EIF基本在1.0以上,其中30°风向角、施扰建筑位于y/b=6,x/b=0时,其EIF最大可达2.68;上游位置的干扰会使受扰建筑的卓越频率有所减小,并降低其低频段和高频段能量。 Through the aeroelastic model vibration measurement test,the acceleration response of two building models of the same size under the condition of reduced wind speed,wind direction angle change and disturbing position change was analyzed.The isoline maps of the interference factor IF of the acceleration response root mean square and the enveloping interference factor EIF of the full wind speed were drawn,the interference effect of the building under different conditions was discussed,and the time-frequency analysis of typical working conditions was carried out.The results show that when the two buildings are arranged in series and the disturbed buildings are located at y/b=6,the root mean square of the transverse wind acceleration response of the buildings reaches the maximum.When the two buildings are arranged side by side and the disturbing buildings are located at x/b=2,the transverse wind acceleration response of the buildings decreases most obviously.With the increase of wind direction angle,the transverse wind acceleration response of the building decreases.The disturbed buildings located upstream have a strong influence on the wind vibration response of disturbed buildings,which generally amplifies the wind vibration response of disturbed buildings.The EIF of the disturbed buildings at different wind angles is generally above 1.0.When the wind direction angle is 30°and the disturbed buildings are located at y/b=6 and x/b=0,the maximum EIF can reach 2.68.Interference from upstream locations reduces the superior frequency of the disturbed building and reduces its low-band and high-band energy.

作者王乾森郑云飞杨雄伟崔会敏刘庆宽 WANG Qiansen;ZHENG Yunfei;YANG Xiongwei;CUI Huimin;LIU Qingkuan(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Department of Railway Engineering,Shijiazhuang Institute of Railway Technology,Shijiazhuang 050043,China;School of Geology and Engineering,Hebei GEO University,Shijiazhuang 050031,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Department of Mathematics and Physics,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang 050043,China)