摘要
为研究屋顶雨棚风荷载特性,考虑3个不同建筑高度,开展缩尺模型的风洞试验。通过对雨棚进行上下表面的多点同步测压,分析对比不同下部建筑时雨棚的平均风压、脉动风压以及风压极值系数,并研究不同位置风压之间的相关性,并建立数值模型,模拟分析雨棚离建筑屋顶不同高度的风荷载及流场形态。结果表明:雨棚所受风荷载受到了下部建筑的强烈干扰,雨棚与屋面间的空间内流场相对稳定;建筑的高度对雨棚结构的风荷载系数有显著影响;随着模型高度的增加,上下表面压力之间的相关性逐渐减小,减小程度随风向角而变化。最不利的建筑高度为12 m,在此高度下,上部雨棚的最大净风压系数接近-7.0;对于24 m高的建筑,最大净风压系数则为-4.8;当雨棚距离屋顶大于3 m后,下部建筑对雨棚所受风荷载的影响较小。
In order to analyze the wind load characteristics of roof canopy,three different building heights are considered,and wind tunnel tests of scaled models are carried out.Through the multi-point synchronous pressure measurement of the upper and lower surfaces of the canopy,the average wind pressure,fluctuating wind pressure and extreme wind pressure coefficient of the canopy under different buildings are analyzed and compared,and the correlation between the wind pressure at different positions is studied.Numerical models were further developed to simulate and analyze the wind loads and flow patterns at different heights of the canopy from the building roof.The results show that the wind load on the canopy is strongly disturbed by the lower building,and the flow field in the space between the canopy and the roof is relatively stable.The height of the building has a significant impact on the wind load coefficient of the canopy structure.With the increase of model height,the correlation between the upper and lower surface pressures gradually decreases,and the degree of reduction changes with the wind direction angle.The study shows that the most unfavorable building height is 12 m.At this height,the maximum net wind pressure coefficient of the upper canopy is close to-7.0.For 24 m high buildings,the maximum net wind pressure coefficient is-4.8.When the distance between the canopy and the roof is greater than 3 m,the impact of wind load on the canopy from the building is relatively small.
作者
李明
蒋媛
朱皓
LI Ming;JIANG Yuan;ZHU Hao(PowerChina Chengdu Engineering Corporation Limited,Chengdu,Sichuan 610072,China;School of Civil Engineering,Chongqing University,Chongqing 400030,China)
出处
《水利与建筑工程学报》
2025年第4期36-45,149,共11页
Journal of Water Resources and Architectural Engineering
基金
中国电建集团成都院科技项目(P62824)。
关键词
屋顶雨棚
风洞试验
风压分布
极值风压
roof canopy
wind tunnel testing
wind pressure distribution
extreme wind pressure
