上部吸气控制下超高层建筑的平均风荷载特性研究

发布时间：2018-08-29 10:25

【摘要】：为减小超高层建筑的风荷载,改善结构的抗风性能,设计了一套吸气控制系统,完成了上部吸气控制下超高层建筑刚性模型的测压风洞试验,研究了不同风向角下吸气控制的几何参数和流量参数对模型的平均风荷载特性的影响规律。结果表明:吸气控制对吸气孔高度范围内的平均风压系数和层阻力系数的折减要显著大于非吸气控制段的风荷载折减;吸气流量系数CQ越大,吸气控制段的风荷载折减越显著,当CQ绝对值从0.004 57增大到0.017 4时,模型上部8~10层(吸气孔高度范围内)的层阻力系数最大折减值由0.094增大到0.231;在不同来流风向角下,吸气控制效果差异较大。因此,为实现吸气减阻,应根据建筑所在地的主导风向角确定最佳开孔方案。
[Abstract]:In order to reduce the wind load and improve the wind resistance of the super high-rise building, a suction control system is designed, and the pressure measurement wind tunnel test of the rigid model of the super high-rise building under the upper inspiratory control is completed. The effects of geometries and flow parameters of suction control on the average wind load characteristics of the model are studied at different wind direction angles. The results show that the reduction of the average wind pressure coefficient and the layer resistance coefficient in the height range of the suction hole is significantly greater than that in the non-inspiratory control section, and the larger the inspiratory flow coefficient CQ is, the more significant the wind load reduction is in the inspiratory control section. When the absolute value of CQ increases from 0.004 57 to 0.017 4, the maximum reduction value of the layer resistance coefficient of the upper 810 layers (within the height range of the suction hole) increases from 0.094 to 0.231. Therefore, in order to achieve suction drag reduction, the best opening scheme should be determined according to the leading wind direction angle of the building location.
【作者单位】：哈尔滨工业大学结构工程灾变与控制教育部重点实验室;
【基金】：国家自然科学基金(51108142) 中国博士后科学基金(2011M500672;2013T60377)
【分类号】：TU973.213

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