北京2022年冬奥会内场主火炬抗风性能研究

RESEARCH ON WIND-INDUCED PERFORMANCE OF MAIN TORCH STRUCTURE DURING IGNITION CEREMONY OF BEIJING 2022 OLYMPIC WINTER GAMES

北京2022年冬奥会和冬残奥会主火炬,是典型的舞美造型结构体,呈大面积薄壁状,对风荷载极为敏感,在点火仪式中有倾斜支撑和竖直悬挂两种典型状态。其中,倾斜支撑状态需要确定结构设计所需的风荷载,竖直悬挂状态需要给出主火炬的风振响应。该文基于实测数据,给出了国家体育场周边的平均风速剖面和湍流度剖面,通过缩尺模型风环境风洞试验及2月份局地风速概率分布,确定了主火炬结构倾斜支撑状态与竖直悬挂状态的正常运行风速;通过主火炬倾斜支撑和竖直悬挂状态的测力风洞试验,得到了作用于主火炬风荷载的体型系数;并通过随机振动分析给出了竖直悬挂状态的风振响应,为北京2022年冬奥会主火炬点火仪式的顺利进行提供了技术支撑。

The main torch structure of the Beijing 2022 Olympic Winter Games is a typical stage-shaped structure with a large area of thin walls,being extremely sensitive to wind loads.There are two typical states:inclined support and vertical suspension state in the ignition ceremony,respectively.Among them,the inclined support state needs to determine the wind load required for structural design,and the vertical suspension state needs to show the wind-induced vibration response of the main torch structure.Based on the measured data,the average wind speed profile and turbulence one around the National Stadium are respectively presented.Through the wind tunnel test of scale model wind environment and the probability distribution of local wind speed in February,the determined is the normal operating wind speed of the main flare structure both in inclined support state and in vertical suspension one.The shape coefficient is obtained by the force-measuring wind tunnel test of the main torch structure on the inclined support state and vertical suspension one.The random wind vibration response of the vertical suspension state is also developed,which provides a technical support for the smooth progress of the main torch structure in the ignition ceremony for the 2022 Winter Olympics in Beijing.