公铁平层超宽钢箱梁-列车系统气动参数数值模拟研究  

Numerical Simulation Study on Aerodynamic Parameters of Super-wide Steel Box Girder-Train System of Road-cum-Railway on Flat Player

作　　者：段青松[1,2] 李建兴 吴再新 DUAN Qingsong;LI Jianxing;WU ZAIXIN(School of Mechanics and Engineering,Southwest Jiaotong University,Chengdu 610041,China;Sichuan Railway Investment Group Company Limited,Chengdu 610041,China)

机构地区：[1]西南交通大学力学学院,成都610041 [2]四川省铁路产业投资集团有限责任公司,成都610041

出　　处：《铁道建筑》2021年第1期1-4,共4页Railway Engineering

基　　金：中国博士后科学基金(2019M663897XB)。

摘　　要：采用数值模拟方法对公铁平层超宽流线形钢箱梁上列车与主梁的气动力特性进行了分析。测试了车桥组合下列车与桥梁的平均气动力系数,讨论了风攻角、列车位置对列车气动力的影响;研究了列车及主梁的二维气动导纳。结果表明:列车位于迎风侧(Ⅰ车道)时离桥梁前缘较近,直接受来流风作用,列车的阻力系数比位于其他车道时偏大;列车位于背风侧(Ⅱ车道—Ⅳ车道)时桥梁断面钝化,气流在桥梁迎风侧栏杆处分离,列车平均阻力系数降低。流线形钢箱梁断面升力气动导纳比Sears函数略小,但基本一致;桥上列车升力的气动导纳比单独列车升力的气动导纳偏小,比Sears函数略偏大。The aerodynamic characteristics of train and main girder on the super-wide streamline steel box girder of road-cum-railway on flat player were analyzed by numerical simulation method.The mean aerodynamic coefficients of train and main girder under the combination of train and bridge were tested,and the effects of attack angle and train position on the aerodynamic forces of train were discussed.The two-dimensional aerodynamic admittance of train and main girder was studied.The results show that when the train is located in the windward side(laneⅠ),it is close to the front edge of the bridge,and is directly affected by the incoming wind,so the resistance coefficient of the train is larger than that in other lanes.When the train is located in the leeward side(laneⅡ-laneⅣ),the bridge section is bluff and the air flow is separated at the railings on the windward side of the bridge,and the mean resistance coefficient of the train is reduced.The lift aerodynamic admittance of streamlined steel box girder section is slightly smaller than Sears function,but basically consistent.The lift aerodynamic admittance of train on bridge is slightly smthan that of single train,and slightly larger than Sears function.

关 键 词：公铁两用桥 超宽流线形钢箱梁 数值模拟 车桥系统 平均气动力 气动导纳 

分 类 号：U448.121[建筑科学—桥梁与隧道工程]