串列圆角弧边三角形双塔建筑气动干扰效应  

Aerodynamic Interference Effect of Two Rounded Corner Arc Triangular High-Rise Buildings in Tandem Configurations

作　　者：丁通 陈水福[1] DING Tong;CHEN Shuifu(College of Civil Engineering and Architecture,Zhejiang University Hangzhou,310058,China)

机构地区：[1]浙江大学建筑工程学院,杭州310058

出　　处：《振动．测试与诊断》2023年第2期223-230,405,共9页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(51878607)。

摘　　要：对圆角弧边三角形双塔建筑在串列布置时的气动力进行了风洞试验研究,分析了不同排布方式和相对间距对受扰建筑层阻力系数、层升力系数以及基底弯矩系数功率谱密度的影响。试验结果表明:平均层阻力和升力系数的干扰效应主要表现为遮挡效应,当施扰建筑弧面迎风时相对更强;平均层阻力系数随间距比减小而减小,当双塔均关于来流方向对称时,平均层升力系数接近0,此时间距影响很小;顶部绕流会减弱遮挡作用,使得顶部附近的平均和脉动层风力系数相对增大;施扰建筑弧面迎风时脱落在尾流的漩涡将显著影响受扰建筑,大幅增强小间距比时受扰建筑的脉动风荷载,并使其横风向基底弯矩系数功率谱的峰值频率受控于尾流漩涡脱落频率。The aerodynamic force of two rounded corner arc triangular high-rise buildings in tandem configurations has been studied with the wind-tunnel tests.The effect of different arrangements and relative distances on the layer drag coefficients,layer lift coefficients and overturning moment coefficients power spectrum of the disturbed building is analyzed.The results show that the interference effect of the mean layer drag and lift coefficients is mainly incarnated in shielding effect,which is relatively stronger when the arc surface of the disturbing building is windward.The mean layer drag coefficients decrease as the spacing ratio decreases.When the buildings are symmetrical about the flow direction,the mean layer lift coefficients are close to 0,and the influence of spacing is small.The flow around the top of the disturbing building makes the shielding effect weak,relatively increasing the mean and fluctuating layer wind force coefficients near the top.When the arc surface of the disturbing building is windward,the vortex shedding in the wake significantly affects the disturbed building,greatly increasing the fluctuating wind load when the spacing ratio is small,and making the peak frequency of the across-wind overturning moment coefficients power spectrum controlled by the wake vortex shedding frequency.

关 键 词：高层建筑 干扰效应 风洞试验 串列 三角形截面 

分 类 号：TU312.1[建筑科学—结构工程] TU971[机械工程—机械设计及理论] TH113