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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第10卷    第6期    总第56期    2013年12月

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文章编号:1672-7029( 2013) 06-0007-07
不同车流对桥梁静三分力及局部风压影响的风洞试验研究
韩艳1,刘书倩1,宋奎1,蔡春声12,何旭辉3

(1.长沙理工大学桥梁工程安全控制省部共建教育部重点实验室,湖南长沙410114;
2.美国路易斯安那州立大学土木与环境工程,美国路易斯安那州,巴吞鲁日70803;
3.中南大学土木工程学院,湖南长沙410075
)

摘 要: 在风-车-桥耦合系统中,不同交通状态车辆将引起桥梁气动力和局部风压的变化。采用测压法测试了不同车流下桥梁断面三分力系数随攻角的变化情况,研究了不同车流下车辆对三分力系数以及局部风压的影响。研究结果表明: 在堵车情况下车辆对桥梁断面三分力影响最大,车辆引起桥梁阻力系数和升力矩系数显著减小,使升力系数增大。在车桥耦合风场作用下,桥梁顶面迎风侧压力值产生由正到负的剧烈幅值变化。

 

关键字: 风-车-桥耦合系统; 桥梁断面三分力; 局部风压; 风洞试验

Experimental studies on influence of vehicles on static aerodynamic forces and local pressure under different traffic flow
HAN Yan1,LIU Shuqian1,SONG Kui1,CAI Chunsheng12,HE Xuhui3

1.Key Laboratory for Safety Control of Bridge Engineering,Ministry of Education and Hunan Province,Changsha University of Science & Technology,Changsha 410114,China; 2.Department of Civil and Environmental Engineering,Louisiana State University,Baton Rouge LA 70803,USA;
3.School of Civil Engineering,Central South University,Changsha 410075,China

Abstract:Different traffic flow conditions will cause the change of bridge aerodynamic characteristics and local wind pressure distribution in the wind-vehicle-bridge coupling systems.Pressure measuring method was used to test the bridge aerodynamic coefficients with wind attack angle under different flow traffic conditions.The influence of vehicles on the bridge aerodynamic coefficients and local pressure of the bridge under different traffic flow conditions was investigated.The results show that under traffic jams condition,the influence of vehicles on aerodynamic coefficients of bridge cross sections is the greatest,which decreases drag coefficient and moment coefficient significantly and increases lift coefficient.In the wind-vehicle-bridge coupling systems,the pressure at windward side of the top surface of the bridge changes from positive to negative intensively.

 

Key words: wind-vehicle-bridge coupling system; static aerodynamic forces; local pressure; wind tunnel tests

ISSN 1672-7029
CN 43-1423/U

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