考虑地貌影响平屋面低矮建筑屋面局部风压特性试验研究

发布时间：2018-08-10 07:56

【摘要】：基于缩尺比为1∶20的平屋面低矮房屋风洞试验模型,在A、B、C三类不同地貌条件下,以风向角为变量,研究地貌对低矮建筑屋面局部平均、脉动以及极值风压分布的影响。试验结果表明:屋面局部区域受风向角影响较大并呈现一定规律性。迎风屋面边沿区域以及角部区域受风向影响最为明显且风压大于其他区域;在斜风向45°风向角时,迎风屋面边沿区域角部测点平均、脉动、极值风压系数最大,为该类房屋最不利风向角;不同地貌对低矮房屋屋面平均风压系数影响较小,对脉动、极值风向系数影响较大。在0°、90°风向角时迎风屋面边沿平均风压系数受地貌影响较大,在斜风向下地貌的改变对屋面平均风压系数影响不大;随湍流度的增大屋面平均、脉动、极值风压系数绝对值也相应增大。
[Abstract]:Based on the wind tunnel test model of flat roof and low building with 1:20 scale ratio, the influence of geomorphology on the local average, pulsation and extreme wind pressure distribution of low building roof is studied with wind direction angle under three different geomorphological conditions of Agna Bu C. The test results show that the local area of roof is influenced by wind direction angle and presents certain regularity. The windward roof edge area and corner area are most affected by wind direction and the wind pressure is larger than other regions, when the inclined wind direction is 45 掳wind direction angle, the mean measuring point, pulsation and extreme wind pressure coefficient of the windward roof edge area are the largest. Different landforms have little influence on the average wind pressure coefficient of the low house roof, but have great influence on the pulsation and extreme wind direction coefficient. When the wind direction angle is 0 掳or 90 掳, the average wind pressure coefficient along the edge of the upwind roof is greatly affected by the geomorphology, but the change of geomorphology under the inclined wind has little effect on the average wind pressure coefficient of the roof, and with the increase of the turbulence degree, the mean wind pressure coefficient of the roof is fluctuating. The absolute value of extreme wind pressure coefficient also increases correspondingly.
【作者单位】：湖南科技大学土木工程学院;湖南建筑高级技工学校建筑工程系;
【基金】：国家自然科学基金项目(51578237) 湖南科技大学研究生创新基金(SI40008)
【分类号】：TU312.1

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