紊流风特性参数对矩形结构表面平均风荷载的影响

发布时间：2018-04-05 21:18

本文选题：风洞试验　切入点：紊流强度　出处：《建筑科学与工程学报》2017年06期

【摘要】：为了得到风特性参数变化对结构表面风压分布的影响规律,在风洞中采用格栅紊流,分别形成了紊流强度相同但积分尺度不同与积分尺度相同但紊流强度不同的几种局部紊流风场,以此来研究紊流风特性参数对矩形结构表面风压分布规律的影响,并给出了考虑这些影响的修正公式。结果表明:紊流强度增大会使矩形结构表面正压区体型系数增大,负压区体型系数绝对值减小;正压区风压变化规律与结构尺度无关,负压区体型系数除了受来流紊流强度影响外,还存在明显的尺度效应;紊流积分尺度增大会使矩形结构表面体型系数绝对值也增大,但不同区域变化幅度没有规律,很难进行统一修正。
[Abstract]:In order to obtain the influence of wind characteristic parameters on the distribution of wind pressure on the surface of the structure, the grid turbulence is used in the wind tunnel.Several local turbulent wind fields with the same turbulence intensity but different integral scale and different turbulence intensity are formed respectively. The influence of turbulent wind characteristic parameters on the distribution of wind pressure on the surface of rectangular structures is studied.A modified formula considering these effects is also given.The results show that the increase of turbulence intensity will increase the shape coefficient of the barotropic region and decrease the absolute value of the shape coefficient in the negative pressure region, and the variation of wind pressure in the barotropic region is independent of the structure scale.The shape coefficient in negative pressure region is affected by the intensity of turbulent flow, but there is also obvious scale effect, and the absolute value of surface shape coefficient of rectangular structure increases with the increase of turbulence integral scale, but there is no rule of variation in different regions.It is difficult to make a uniform correction.
【作者单位】：长安大学公路学院;长安大学公路大型结构安全教育部工程中心;
【基金】：中国博士后科学基金项目(2014M560737,2016T90876)
【分类号】：TU312.1

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