马鞍屋盖表面面积平均风压特性研究

董欣;叶继红

振动与冲击 ›› 2011, Vol. 30 ›› Issue (7) : 21-30,6.

PDF(3458 KB)
PDF(3458 KB)
振动与冲击 ›› 2011, Vol. 30 ›› Issue (7) : 21-30,6.
论文

马鞍屋盖表面面积平均风压特性研究

  • 董欣;叶继红
作者信息 +

Research of area-averaged pressure on saddle roofs

  • Dong xin; Ye Ji-hong
Author information +
文章历史 +

摘要

为完善我国建筑荷载规范中有关围护结构和覆面材料的设计,本文提出了面积平均风压的概念。通过刚性模型风洞测压试验,研究了马鞍屋盖表面的面积平均风压特性。⒈ 以锥形涡为引,确定各矢跨比马鞍屋盖表面出现锥形涡的来流工况,以涡核吸力和涡核互相关性为依据,确定了马鞍屋盖的最不利风向为沿高点连线方向。⒉ 在一定附属区域内对单点风压进行集合,得到面积平均风压(时程);在马鞍屋盖表面实行各种分区,探讨了最不利风向下各面积平均风压时程的峰值吸力随附属面积的变化趋势,得到了相应的拟合公式;通过各区域内单点风压时程的累积概率分布,验证了该拟合公式的准确性与有效性;根据偏度和峰度值大小,分析了面积平均风压时程的非高斯特性,并与单点时程的风压特性进行了比较,结果表明面积平均风压时程曲线中风压脉动分布均匀,高频脉动减少,因而其非高斯特性并不如单点突出,且普遍偏向高斯分布

Abstract

In order to complete the wind resistant design of enclosure structure and cladding elements, concept of area-averaged pressure is proposed, and its characteristics are systematically studied by wind tunnel test. Firstly, starting from conical vortex, the approaching flow conditions which cause the generation of conical vortex are identified. Based on suction and correlation coefficient of vortex cores, the most unfavorable attack angle for saddle roof is confirmed to be along the connection of high points. Secondly, the area-averaged pressures are calculated by averaging all pressure taps within the area at each instant of time. The relationships between peak loads over various tributary zones and increasing tributary area are presented and fitted, which are verified by the cumulative probability curve of single point pressure. Non-Gaussian feature of area-averaged pressure time series is analyzed and compared with that of point pressure according to skewness and kurtosis. Results indicate that area-averaged pressure, whose uniform fluctuations concentrate on low-frequency range, is more normally distributed than individual pressure.

关键词

马鞍屋盖 / 锥形涡 / 面积平均风压 / 非高斯特性

Key words

saddle roof / conical vortex / area-averaged pressure / non-Gaussian feature

引用本文

导出引用
董欣;叶继红. 马鞍屋盖表面面积平均风压特性研究[J]. 振动与冲击, 2011, 30(7): 21-30,6
Dong xin;Ye Ji-hong. Research of area-averaged pressure on saddle roofs[J]. Journal of Vibration and Shock, 2011, 30(7): 21-30,6

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