摘要
对青海花土沟机场航站楼长悬挑圆弧形大跨钢屋盖的风荷载特性进行风洞试验研究。基于计算流体力学软件Fluent 6.3,选用RNGκ-ε湍流模型对屋盖结构的平均风压系数分布、局部体型系数、风速矢量以及风场流迹线等风荷载特性进行系统研究。结果表明:数值模拟可以较好地反映实际风荷载对建筑物的作用,且具有直观呈现风场流动特性的优势;屋盖挑檐部分受到下顶上吸的叠加作用,长悬挑区域最大净体型系数试验值达-3.17,对屋盖结构极为不利;在前挑檐上开设洞口可有效减缓其承受风荷载作用,尤其能减缓斜向迎风作用下的风荷载作用。
Wind tunnel test for wind load characteristics of long-overhang circular-arc large-span steel roof of an airport terminal structure was carried out. Three-dimensional steady wind flow field numerical simulation was carried out by computational fluid dynamics software Fluent 6. 3. The mean wind pressure coefficient,shape coefficient of local partition,velocity vector and streamline on structure roof were systematically studied by numerical simulation with RNG κ-ε model. The results showed that the numerical simulation was a feasible way to study the characteristics of wind load on the structure. It had the advantage of showing the wind flow around structure intuitively. The maximum net shape coefficient of long roof overhang was- 3. 17 because of the combined action of pressure on lower surface and suction on upper surface. It was very unfavorable for the roof structure. The wind loads on windward roof areas were reduced effectively by making several holes in front eaves,especially in the oblique wind direction.
出处
《工业建筑》
CSCD
北大核心
2016年第10期136-142,共7页
Industrial Construction
基金
陕西省工业攻关项目(2014K06-23)
中央高校基本科研业务费专项资金项目(2014G1281070)
关键词
圆弧形大跨屋盖
风荷载特性
风洞试验
数值分析
风压系数
体型系数
circular-arc large-span roof
characteristic of wind load
wind tunnel test
numerical analysis
wind pressure coefficient
shape coefficient