风屏障对公铁同层双幅桥-列车气动特性的影响  

Effect of wind barrier on aerodynamic characteristics of twin parallel decks for rail-cum-road bridge and train

作　　者：邹云峰[1,2,3] 刘政华 何旭辉 刘路路[1,2] 杨甲锋 ZOU Yunfeng;LIU Zhenghua;HE Xuhui;LIU Lulu;YANG Jiafeng(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Research Center of High-speed Railway Construction Technology,Changsha 410075,China;Key Laboratory for Disaster Prevention and Mitigation of Rail Transit Engineering Structures of Hunan Province,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]高速铁路建造技术国家工程研究中心,湖南长沙410075 [3]轨道交通工程结构防灾减灾湖南省重点实验室,湖南长沙410075

出　　处：《铁道科学与工程学报》2025年第3期1144-1153,共10页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51925808);湖南省杰出青年科学基金资助项目(2022JJ10082)。

摘　　要：设置风屏障是保障强风作用下桥上列车行车安全的一种有效措施,但风屏障对车-桥系统气动特性的影响受列车下部结构形式影响显著。为此,通过节段模型测力和测压风洞试验,研究风屏障对我国首座大跨公铁同层双幅桥-列车气动特性的影响。研究结果表明:不同风向角下风屏障对铁路主梁平均气动力系数的影响基本相似;风向角β=0°时风屏障主要影响铁路主梁脉动升力系数,而风向角β=180°时风屏障主要影响铁路主梁脉动阻力系数。风向角β=0°时风屏障对公路主梁脉动气动力系数影响较小,而风向角β=180°时风屏障主要影响铁路主梁脉动阻力系数和脉动升力系数。风向角β=0°时风屏障对列车平均阻力系数的影响大于风向角β=180°时风屏障的影响;而风向角β=180°时风屏障对列车脉动阻力系数的影响大于风向角β=0°时风屏障的影响;风向角β=0°时,风屏障主要影响列车迎风面及迎风面与底面圆弧过渡段处平均风压系数,而风向角β=180°时,风屏障主要影响迎风面及迎风面与顶面圆弧过渡处的平均风压系数;风屏障对列车平均风压系数的影响与风向角密切相关,进而导致风屏障对不同风向角下列车气动力的影响差异显著;风向角β=0°时风屏障能有效降低列车底部圆弧过渡段区域内气流脉动性,而风向角β=180°时风屏障对列车顶部圆弧过渡段区域内气流脉动性的削弱作用有限。研究成果为同类型双幅桥梁风屏障设计提供参考和依据。The installation of wind barriers is an effective measure to ensure the safety of train operation on bridges under strong wind conditions.However,the impact of wind barriers on the aerodynamic characteristics of the train-bridge system is significantly influenced by the structural form of the train’s lower part.To this end,through sectional model force measurement and pressure measurement wind tunnel tests,this article investigated the influence of wind barriers on the aerodynamic characteristics of China’s first large-span,double-deck bridge with both rail and road layers-the train system.The results show that the effect of wind barriers on the average aerodynamic force coefficients of the railway main beam is basically similar under different wind direction angles.At a wind direction angle β=0°,the wind barrier mainly affects the fluctuating lift coefficient of the railway main beam.While at a wind direction angle β=180°,the wind barrier can mainly affect the fluctuating drag coefficient of the railway main beam.At a wind direction angle β=0°,the wind barrier has a minor impact on the fluctuating aerodynamic force coefficients of the highway main beam.While at a wind direction angle β=180°,the wind barrier can mainly affect the fluctuating drag coefficient and fluctuating lift coefficient of the railway main beam.At a wind direction angle β=0°,the wind barrier has a greater impact on the average drag coefficient of the train than at a wind direction angle β=180°.While at a wind direction angle β=180°,the wind barrier has a greater impact on the fluctuating drag coefficient of the train than at a wind direction angle β=0°.At a wind direction angle β=0°,the wind barrier mainly affects the average wind pressure coefficient at the windward side and the transition section between the windward side and the bottom arc,while at a wind direction angle β=180°,the wind barrier mainly affects the average wind pressure coefficient at the windward side and the transition section between the windward s

关 键 词：风屏障 公铁双幅桥 车桥系统 风洞试验 气动特性 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]