七里河体育场罩棚风压分布数值模拟研究  

Numerical Simulation of Wind Pressure Distribution in Canopy of Qilihe Stadium

作　　者：黄兆升 黄锐 王栋 HUANG Zhaosheng;HUANG Rui;WANG Dong(Gansu Institute of Architectural Design and Research,Lanzhou 730030,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]甘肃省建筑设计研究院有限公司,兰州730030 [2]兰州理工大学土木工程学院,兰州730050

出　　处：《结构工程师》2024年第2期110-117,共8页Structural Engineers

摘　　要：以兰州市七里河体育场为工程背景,基于ANSYS-CFX 19.0软件平台,采用SSTk-ω湍流模型对体育场罩棚12个风向角下表面风压分布特性进行了数值模拟,分析了风向角和周围建筑物对风压分布的影响,获得了罩棚表面风压分布的规律,并探讨了罩棚周围流场的绕流特性,最后根据罩棚的结构形式及风压分布特点,给出了最不利风向下罩棚表面的分区风压系数以及罩棚设计风荷载的计算方法。结果表明:周边干扰建筑物对体育场中心周围的风场和表面风压有明显的影响,数值模拟结果符合钝体绕流规律;风向角对风荷载的影响较大,不同风向角下,来流的分离和漩涡脱落作用均有较大的不同;屋面最大负风压区出现在沿风向的屋面前缘角部,且迎风向前端出现正压区,模拟结果可供实际工程采用。Based on ANSYS-CFX 19.0 software platform and Lanzhou Qilihe Stadium as the engineering background,this paper uses SST k-ωturbulence model to numerically simulate the surface wind pressure distribution characteristics under 12 wind angles of the stadium canopy,and analyzes the influence of wind angles and surrounding buildings on wind pressure distribution.The distribution law of the wind pressure on the surface of the canopy is obtained,and the characteristics of the flow field around the canopy are discussed.Finally,according to the structure of the canopy and the characteristics of wind pressure distribution,the zonal wind pressure coefficient of the canopy surface under the most unfavorable wind direction and the calculation method of the design wind load of the canopy are given.The results show that the wind field and surface wind pressure around the center of the stadium are obviously affected by the surrounding disturbance buildings,and the numerical simulation results are consistent with the law of the flow around the blunt body.Wind direction has a great influence on wind load.The separation of incoming flow and vortex shedding are different under different wind direction.The maximum negative wind pressure zone appears at the leading-edge corner of the roof along the wind direction,and the positive pressure zone appears at the front end of the roof facing the wind direction.The simulation results can be used in practical projects.

关 键 词：体育场 ANSYS-CFX SSTk-ω湍流模型 数值模拟 风压分布 体型系数 

分 类 号：TU312.1[建筑科学—结构工程]