摘要
雄安站屋盖体型独特,属于风荷载敏感结构,抗风设计非常重要。为明确风荷载取值,对雄安站进行了刚性模型风洞试验。在风洞试验的基础上,着重分析了屋盖悬挑部分风荷载的分布情况。结果表明,屋盖悬挑上表面在剧烈流动分离的影响下风荷载体型系数可达到-2.3;雨棚局部镂空区域对风荷载的影响较小。基于风洞试验得到的风压时程,对屋盖结构进行了风致响应计算,并给出高架候车厅屋盖及雨棚各结构单元不利风向角。最后,采用有限元软件Fluent对过站列车风进行数值模拟分析,得到列车风风压的空间分布形态。列车过站时,结构上的列车风压力峰值随车体与结构距离增大迅速衰减,在列车以350km/h速度运行通过时,高架候车层可满足舒适性要求。
The roof of Xiong’an railway station has a unique shape,which is a wind load sensitive structure,so that the wind resistance design is very important.In order to clarify the value of the wind load,the rigid model wind tunnel test was carried out.Based on the wind tunnel test,the wind load distribution of the cantilevered part of the roof was analyzed emphatically.The results show that the wind load shape coefficient of the cantilever upper surface of the roof can reach-2.3 under the influence of violent flow separation.The local hollowed out area of the canopy has little influence on the wind load.Based on the wind pressure time-history obtained from the wind tunnel test,the wind-induced response of the roof structure was calculated,and the adverse wind attack angle of each structural unit of the roof and canopy were given.Furthermore,Fluent software was used to simulate the train induced wind when passing through the station,and the spatial distribution of the train induced wind pressure was obtained.When the train passes the station,the peak value of wind pressure on the structure decreases rapidly with the increase of the distance between the train and the structure.When the train runs through at the speed of 350 km/h,the overhead layer can meet the comfort requirements.
作者
张宇
何连华
符龙彪
范重
朱丹
刘涛
李保卫
周鹏飞
ZHANG Yu;HE Lianhua;FU Longbiao;FAN Zhong;ZHU Dan;LIU Tao;LI Baowei;ZHOU Pengfei(China Architecture Design&Research Group,Beijing 100044,China;China Academy of Building Research,Beijing 100013,China;China Construction Third Bureau First Engineering Co.,Ltd.,Wuhan 430040,China)
出处
《建筑结构》
CSCD
北大核心
2021年第24期13-20,共8页
Building Structure
关键词
雄安站
大跨屋盖结构
风荷载体型系数
风洞试验
风振分析
列车风
Xiong’an Railway Station
large-span roof structure
wind load shape coefficient
wind tunnel test
wind-induced vibration analysis
train induced wind
