摘要
轨顶之上大于5 m高度范围内建筑或构件因列车风所形成的风压缺乏完善的计算方法。测试雨棚表面空气压力变化、振动加速度等参数,并基于计算流体力学软件Fluent,针对250~380 km/h高速列车作用于全封闭雨棚屋盖的脉动风荷载问题,基于三维非稳态的k-ε两方程紊流模型,采用滑移网格技术的数值仿真,计算多种车速条件下列车通过雨棚覆盖区域的动态风场过程,分析雨棚屋盖表面风压分布规律及雨棚侧向开口率对其表面风压的影响,得出雨棚屋盖各部位的脉动风荷载时程曲线等结果数据及多种参数的影响规律;并与实测结果进行对比分析。结果表明:车速250~380 km/h时,雨棚屋盖所受列车风风压随列车速度的增加而加速增大,与雨棚至轨顶距离呈现近双曲线性反比关系,风压值分布沿雨棚宽度呈现由轨顶正上方垂直轨道向外减小的规律;理论计算风压值及其与实测列车脉动风荷载时程曲线形状、参数影响规律等均相符较好;高速列车经过时雨棚屋盖表面受到瞬时脉冲荷载作用;雨棚屋盖距离轨顶标高不同时列车风压受到明显影响。
Study on Surface Wind Pressure of Canopy Structure During High-speed Train Passage.As canopy is a typical track adjacent structure,train-induced pressure and its aerodynamic effects on canopy structure cannot be ignored.Aiming at the problem of the fuctuating wind load acting on the canopy caused by G series high-speed train with the speed of 250~380 km/h,based on 3Dunsteady k-εtwo equation turbulence model,the dynamic wind field processes of trains passing canopy zone at different speeds with different distances between the canopy and track center line were simulated and analyzed by using moving mesh method.The time-history curves of fuctuating wind load on various parts of canopy and the influence laws of various parameters were obtained,and were compared with the measured data Results showed that the passage of high-speed train resulted in transient forces on the canopy structure.The distribution of wind pressure value along the height of canopy shows the law of larger on the bottom and smaller on the top.The wind pressure values obtained by theoretical calculation agree well with the time history curves of the measured fluctuating wind load and the influence laws of parameters.
作者
赵光伟
Zhao Guangwei(Architectural Institute,China Railway Design Corporation,Tianjin 300251,China)
出处
《铁道技术标准（中英文）》
2023年第4期28-33,共6页
Railway Technical Standard(Chinese & English)
基金
中国国家铁路集团有限公司科技研究开发计划(P2018G049)
关键词
高速列车
车致风压
全封闭
气动特性
数值模拟
High speed railway
train-induced wind pressure
totally enclosed
aerodynamics charnacteritics
numerical simulation
