鱼形屋盖结构风荷载特性的试验研究  

Experimental study of wind load characteristics on fish-shaped roof structure

作　　者：张明亮[1] 李秋胜[1,2] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]香港城市大学建筑系

出　　处：《空间结构》2012年第1期58-65,共8页Spatial Structures

基　　金：国家自然科学基金重大研究计划重点项目(90815030)

摘　　要：以海南石梅湾游艇会所为工程背景,进行了刚性模型同步测压风洞试验,研究了单体建筑与两栋建筑有相互干扰影响时的鱼形屋盖屋面平均与脉动风压系数、屋盖局部体型系数以及屋盖整体升力系数分布特性,并进行了详细的对比分析研究.研究结果表明:屋盖表面主要呈现负风压(风吸力),在迎风屋檐气流分离较大,风压变化明显,出现较大的负风压系数;当来流顺沿尾部贯通的连廊吹来时,增强的气流对屋盖下表面产生向下的吸力,且这股吸力要大于上表面向上的吸力,屋盖上下表面风压叠加后使该处屋面呈现一定的正风压;干扰建筑的存在对屋面全风向局部体型系数和屋盖整体升力系数有一定的遮挡效应.所得结论对复杂体型屋盖结构的抗风设计具有参考价值.Taking the yacht club of Shimeiwan in Hainan as an investigation object,and adopting wind tunnel test with synchronous measurement on their rigidity models,the mean and fluctuating pressure coefficients,the local shape coefficient distributions and the lift coefficients of the fish-shaped roofs were obtained and discussed for the cases with and without the surrounding buildings.It was found that negative pressures（suctions） occurred on the roofs in general,and high negative pressure coefficients occurred on the eaves and cantilevered roofs.When the airflow flowed along the corridor in the tail,the enhanced flows created suction beneath the surfaces of the roofs,and the suction on the downward surface was greater than the upward surface and positive pressures occurred on that area after superposition.The surrounding building has some shielding effect on the local shape coefficient and the lift coefficient of the roof.These obtained conclusions are useful in the wind-resistant design of roof structures with complex shapes.

关 键 词：屋盖结构 风洞试验 风荷载 升力系数 体型系数 

分 类 号：TU312.1[建筑科学—结构工程]