大跨屋盖脉动风压的非高斯特性研究

叶继红;侯信真

振动与冲击 ›› 2010, Vol. 29 ›› Issue (7) : 9-15.

PDF(2127 KB)
PDF(2127 KB)
振动与冲击 ›› 2010, Vol. 29 ›› Issue (7) : 9-15.
论文

大跨屋盖脉动风压的非高斯特性研究

  • 叶继红 ; 侯信真
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Non-Gaussian features of fluctuating wind pressures on long span roofs

  • YE Jihong; Hou Xinzhen
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文章历史 +

摘要

在大跨屋盖表面局部区域,特别是迎风边缘区域和屋盖拐角区,风荷载会表现出明显的非高斯特性,如果仍采用高斯模型来描述,往往会产生较大误差。基于五种典型大跨度屋盖结构的风洞试验,本文对屋盖表面局部风压的高斯和非高斯特性进行了研究。首先通过对第三阶、第四阶矩统计量归纳分析,给出划分高斯区和非高斯区的标准并对大跨度屋盖进行分区;同时,运用基于k-s检验的曲线拟合方法也得到风压非高斯分区,利用分区结果,得到保证率为99.38%的峰值因子取值。将两种方法相对比,发现得出的分区结果相似:非高斯区域往往集中在来流前缘、后部尾流区及高点角区附近。此外,分析结果表明,对于大跨屋盖结构,应适当提高我国荷载规范中的峰值因子并按结构分区取值。

Abstract

In the partial regions of long span roof surface especially front and corner area, wind load always present distinct characteristics of non-Gaussian. It will produce large error if Gaussian model is still adopted. On the basis of wind tunnel tests, a research was carried out on partition of Gaussian and non-Gaussian regions of wind pressure on the roof surface. Firstly, the third and fourth order statistical moments of fluctuating wind pressures are employed to obtain a description and measurement of the non-Gaussian feature. Furthermore, non-Gaussian regions on long span roofs are determined. In addition, the results of divided non-Gaussian wind pressure regions are also received by using curve fitting method based on k-s test, afterwards, the peak factor of each measuring point is given corresponding to guarantee rate 99.38 percent. Comparing the two methods above, it has been found that the results almost coincide. Non-Gaussian regions tended to be concentrated in the front, wake area and corner area near the high points. The analytic results showed that value of peak factor regulated in Chinese load codes should be improved properly and the value should be taken according to partition of regions.

关键词

大跨屋盖结构 / 风洞试验 / 脉动风压 / 非高斯特性 / 值因子

Key words

long-span roof structure / wind tunnel tests / fluctuating wind pressure / non-Gaussian characteristics / peak factor

引用本文

导出引用
叶继红;侯信真. 大跨屋盖脉动风压的非高斯特性研究[J]. 振动与冲击, 2010, 29(7): 9-15
YE Jihong;Hou Xinzhen. Non-Gaussian features of fluctuating wind pressures on long span roofs[J]. Journal of Vibration and Shock, 2010, 29(7): 9-15

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