具有凹面外形的大跨屋盖结构风荷载分布及风洞试验研究

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (22) : 34-38.

论文

具有凹面外形的大跨屋盖结构风荷载分布及风洞试验研究

马文勇刘庆宽

作者信息 +

Analysis on wind loads distribution and wind tunnel test on curved concave long-span roof

Ma Wenyong LIU Qingkuan

Author information +

文章历史 +

摘要

采用刚性模型测压风洞试验获得了某二次凹面结构风荷载分布，对比了不同风速和不同风场类型下平均风压系数与脉动风压系数的变化。结果表明，结构迎风向边缘由于流体分离形成强负压区，流体再附后在屋面大部分区域形成稳定的低正压区；来流风速对结构表面风荷载分布规律及风压系数值影响不大，紊流度对结构表面风荷载尤其是迎风端流体分离区的风压系数有较大影响，在类似结构的风荷载测试中，需要根据实际状况尽可能合理的模拟来流紊流。

Abstract

The wind load distribution on a concave of second degree structure was obtained through pressure- measurement wind tunnel test based on rigid model. Variation of mean and RMS wind pressure coefficients in different wind velocities and different wind terrains were compared and analyzed. The results show that strong negative wind pressure appears in the windward edges due to flow separation and the reattachment area are under stable weak positive pressure; the effect of wind velocity on both wind load distribution and wind pressure coefficient can be neglected; turbulence intensity have a significant effect on wind pressure coefficient especially for windward edges, therefore, it is necessary to simulate appropriate turbulence intensity according to actual situation in wind load test of similar concave structures.

导出引用

马文勇刘庆宽. 具有凹面外形的大跨屋盖结构风荷载分布及风洞试验研究 [J]. 振动与冲击, 2012, 31(22): 34-38

Ma Wenyong LIU Qingkuan. Analysis on wind loads distribution and wind tunnel test on curved concave long-span roof[J]. Journal of Vibration and Shock, 2012, 31(22): 34-38