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为研究多线双层铁路桥梁车辆与桥梁的气动特性,利用三分力分离装置-交叉滑槽系统,对某六线双层大跨铁路斜拉桥进行节段模型风洞试验。测试了不同车桥组合下车辆与桥梁各自的气动力,研究了单列车的位置、双车同层交会、双车上下层共存时车辆和桥梁气动特性的相互影响,并讨论了风攻角对上层车辆气动力的影响。试验结果表明,当车辆位于桥梁断面不同位置时,车辆气动力差异较大;由于上层桥面宽度较大,气流经过桥梁断面前缘分离后,再附着于较靠后的背风侧车辆,导致背风侧车辆的阻力系数更大;双层车辆共存时,当两者同处于迎风侧,气动力有明显的相互影响;风攻角对背风侧车辆的气动力影响显著。
In order to study the aerodynamic characteristics of vehicles and bridges with multi-track double-deck railway bridges, a section-type wind tunnel test was conducted on a six-lane double-deck long-span railway cable-stayed bridge with a three-component force separating device- The aerodynamic forces between the vehicle and the bridge under different axle combinations are tested. The interaction between the aerodynamic characteristics of the vehicle and the bridge is studied when the single train locates, The aerodynamic effects of the upper vehicle. The test results show that when the vehicle is located at different positions of the bridge section, the aerodynamic force of the vehicle is quite different. Because the width of the upper deck is relatively large, the air flow is separated from the front of the bridge section and reattached to the lee side of the vehicle later, When the two-tier vehicles coexist, the aerodynamic forces significantly affect each other when the two vehicles coexist on the windward side. The wind-attack angle has a significant effect on the aerodynamic forces on the leeward side of the vehicle.