下击暴流作用下大跨平屋面的极值风压分析

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摘要在下击暴流风场中，大跨平屋面建筑顶部的来流分离区及尾流区域处风压具有极强的非高斯特性。基于稳态冲击射流作用下的大跨平屋面建筑刚性测压试验结果，使用高阶统计量法研究了典型径向距离处屋面风压高斯与非高斯分区特性，利用TPP法计算测点峰值因子，发现平屋面表面测点极值风压系数与建筑物离下击暴流喷口间距有密切关系，研究结果表明：在下击暴流作用下，大跨平屋面部分区域出现明显的风压非高斯特性，尤其是迎风面及背风面边缘区域；风压高斯分布区域及屋面结构侧风面边缘区域峰值因子较小，屋面峰值因子取值范围在3.99到9.29之间，测点峰值因子均明显大于《建筑结构荷载规范》中的取值；在不同径向距离处，极值风压系数均为负值，来流分离区域及尾流区域风压系数绝对值较大；极小值风压系数绝对值随径向距离的增加先增大再减小，在径向距离为1.25Djet时极小值风压系数绝对值出现最大值。

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	汪之松1
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关键词 ：冲击射流, 大跨平屋面建筑, 非高斯特性, 峰值因子, 极值风压系数

Abstract：In the downburst wind field, the wind pressure at the top of the large-span flat roof building in the separation zone of the incoming flow and the wake area is extremely non-Gaussian. Based on the results of the rigid pressure test of large-span flat roof buildings under the action of steady-state impinging jets, the high-order statistics method was adapted to study the Gaussian and non-Gaussian partition characteristics of roof wind pressure at typical radial distances. The peak value of the measured points is calculated by the TPP method. It found that the extreme wind pressure coefficient of the measuring point on the flat roof surface is closely related to the distance between the building and the downburst vent. The results show that under the action of downburst, there are obvious non-Gaussian characteristics of wind pressure in some areas of the long-span flat roof, especially in the windward and leeward edge areas, and the peak factors of the Gaussian distribution of wind pressure and the edge of the side wind surface of the roof structure are relatively small. The range of the roof peak factor is between 3.99 and 9.29, and the peak factor of the measuring point is obviously larger than that in the load Code for Building structures. At different radial distances, the extreme wind pressure coefficients are negative, and the absolute values of the wind pressure coefficients in the incoming flow separation region and wake region are larger. The absolute value of the minimum wind pressure coefficient first increases and then decreases with the increase of the radial distance, and the absolute value of the minimum wind pressure coefficient reaches the maximum when the radial distance is 1.25Djet.

Key words： Impinging jet large-span flat roof structure non-Gaussian peak factor extreme wind pressure coefficient

收稿日期: 2021-01-04 出版日期: 2022-06-15

引用本文:

汪之松1，2，向明1，江水灵1，唐阳红1. 下击暴流作用下大跨平屋面的极值风压分析[J]. 振动与冲击, 2022, 41(11): 83-89.
WANG Zhisong1,2, XIANG Ming1, JIANG Shuiling1, TANG Yanghong1. Extreme wind pressure analysis for large-span flat roof under downburst. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(11): 83-89.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I11/83

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