台风“浣熊”影响下近地风特性及低矮房屋屋面风压实测研究

发布时间：2018-03-26 10:55

本文选题：台风“浣熊”　切入点：低矮房屋　出处：《土木工程学报》2015年S1期

【摘要】：基于上海浦东国际机场附近的同济大学实测基地获取的2014年台风"浣熊"影响下的近地风速时程和低矮双坡屋面风压同步实测数据,研究了台风影响下的近地风特性和低矮房屋屋面风压特性。10m高度处实测风速结果表明:纵向的湍流度随平均风速的增大呈减小的趋势,而横向和竖向的湍流度随平均风速的变化趋势不明显。坡角为10°的足尺低矮房屋在"浣熊"影响下,由于屋脊对斜风向来流的气动分离作用,在背风屋面右侧靠近屋脊的位置出现了明显的漩涡脱落,而斜风向下山墙和屋脊的共同作用也导致了第二个旋涡的产生;旋涡处的脉动风压系数峰值随着风向角度的增加呈逐渐增大的趋势,并且也随纵向湍流度的增大而增大。
[Abstract]:Based on the data obtained from Tongji University site near Shanghai Pudong International Airport in 2014 under the influence of Typhoon "raccoon", the time history of near earth wind speed and the wind pressure of low and low double-slope roof are measured synchronously. Under the influence of typhoon, the characteristics of near-ground wind and the measured wind speed at the height of 10 m for the roof of low-rise buildings are studied. The results show that the longitudinal turbulence degree decreases with the increase of mean wind speed. However, the change of horizontal and vertical turbulence with the mean wind speed is not obvious. Under the influence of raccoon, the full-scale low house with slope angle of 10 掳is separated by the aerodynamic action of the ridge on the diagonal wind flow. At the right side of the leeward roof near the roof ridge, there is an obvious vortex falling off, and the combined action of the inclined wind downhill wall and the roof ridge also leads to the second vortex. The peak value of fluctuating wind pressure coefficient increases with the increase of wind direction angle, and increases with the increase of longitudinal turbulence degree.
【作者单位】：同济大学土木工程防灾国家重点实验室;
【基金】：国家自然科学基金项目资助(51178352,51378396)
【分类号】：TU312.1

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