六线双层铁路钢桁桥车桥系统气动特性风洞试验研究  

WIND TUNNEL TESTS ON AERODYNAMIC CHARACTERISTICS OF VEHICLE-BRIDGE SYSTEM FOR SIX-TRACK DOUBLE-DECK STEEL-TRUSS RAILWAY BRIDGE

作　　者：李永乐[1] 徐昕宇 郭建明[1] 向活跃[1] 陈克坚[2] 

机构地区：[1]西南交通大学桥梁工程系,成都610031 [2]中铁二院工程集团有限责任公司,成都610031

出　　处：《工程力学》2016年第4期130-135,共6页Engineering Mechanics

基　　金：国家自然科学基金重点项目(U1334201);铁道部科技研究开发计划项目(2011G026-B);国家重点基础研究发展规划(973)项目(2013CB036206)

摘　　要：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 investigate the aerodynamic characteristics of a vehicle and bridge system for multi-track double-deck railway bridges, a section model wind tunnel test was carried out using three-component aerodynamic force separating equipment, the crossed slot system. A six-track double-deck long-span cable-stayed railway bridge was taken as the research object. Aerodynamic forces on the vehicle, bridge, and various coupled combinations were measured. Aerodynamic interactions in various vehicle-bridge systems were studied, such as a single train at different track positions, two trains crossing on the same deck, and two trains running simultaneously on two decks. Moreover, the effects of different wind attack angles on the upper-layer vehicle were discussed as well. The results show that aerodynamic forces on the vehicle have large differences when positioned at different track positions. Since the upper deck of the railway bridge is comparatively wide, airflow separation caused by the front of the bluff bridge section might lead to the reattachment of the upper stream over the leeward vehicle, thus making the drag coefficient larger. The simultaneous passages of upper-layer and lower-layer vehicles impact the aerodynamic forces of each other when they are both on the windward side. Aerodynamic forces on vehicles are remarkably influenced by wind attack angles.

关 键 词：车桥系统 六线双层铁路桥梁 气动特性 节段模型 风洞试验 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]