下击暴流作用下菱形马鞍面屋盖风压特性

设计制作了菱形马鞍面大跨屋盖结构缩尺模型,通过风洞试验探究了下击暴流作用下菱形马鞍面屋盖表面风压特性.探究了冲击射流装置到模型的径向距离和风向角对屋盖上不同区域平均风压的影响,试验结果表明:最大分区平均风压系数出现在径向距离为1.25Djet(Djet为喷口直径)、风向角为0°的工况;来流方向上屋盖檐口的3个区域平均风...

WIND PRESSURES ON A LARGE-SPAN HYPERBOLIC-PARABOLOID ROOF SUBJECTED TO A SIMULATED DOWNBURST

The scale model of a large-span structure with rhombus hyperbolic-paraboloid roof was designed. A rigid model test under the action of a downburst was carried out. The wind pressure characteristics of rhombus hyperbolic-paraboloid roof under the action of downburst were investigated by the test. The influence of the radial distance and the wind direction angle on the average wind pressure in different areas on the roof was investigated. The experiment results show that: The maximum regional average wind pressure coefficient occurs when the radial distance is 1.25D_jet (D_jet is the spout diameter) and the wind direction angle is 0°; As the radial distance increases, the average wind pressure coefficients of windward firstly increase fast and then decrease, the coefficients in other areas increase first and then tend to be stable; The wind direction angle greatly affects the average wind pressure of each area. The maximum average wind pressure is generated on the roof when θ=0°and the change gradient of wind pressure in the windward is large; The wind load shape coefficients of the corner areas and the edge areas of the roof are both large, and the maximum value reaches ?2.75.