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。
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 in- fluence 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 co- efficient 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.
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2013年第6期7-13,共7页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(50908025
51178066
51108045
51278069)
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开放基金资助项目
交通部西部交通科技项目重大科技专项资助项目(2011318824140)
关键词
风-车-桥耦合系统
桥梁断面三分力
局部风压
风洞试验
wind- vehicle -bridge coupling system
static aerodynamic forces
local pressure
wind tunnel tests