摘要
采用刚性模型测压风洞试验获得某二次凹面结构风荷载分布,对比不同风速、不同风场类型下平均风压系数与脉动风压系数变化。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,需根据实际状况尽可能合理模拟来流紊流。
The wind load distribution on a quadratic concave structure was obtained through pressure measurement and wind tunnel test based on a rigid model. Variations of mean and RMS wind pressure coefficients with different wind velocities and different wind field types were compared and analyzed. The results showed that a strong negative wind pressure appears in the windward edges due to flow separation and the reattachment area are under a stable weak positive pressure; the effect of wind velocity on both wind load distribution and wind pressure coefficients can be neglected; turbulence intensity has a significant effect on wind pressure coefficients, especially, on those in windward edges, therefore, it is necessary to simulate appropriate turbulence intensity according to actual situation in wind load test of similar concave structures.
出处
《振动与冲击》
EI
CSCD
北大核心
2012年第22期34-38,共5页
Journal of Vibration and Shock
基金
国家自然科学基金(51108280)
河北省自然科学基金(E2008000442)
关键词
凹面大跨屋盖
风洞试验
紊流度
风压系数
curved concave long-span roof
wind tunnel test
turbulence intensity
wind pressure coefficients
