车辆对倒梯形钢桁梁桥风荷载影响的风洞试验研究

摘要

With the development of large-span bridges and the development of high-speed railways,significant aerodynamic interference between vehicles and bridges has drawn attention,however,most of the existing research is based on vehicles,the high speed train or blunt-body simply-supported beam,and usually the focus was on influence to average wind load on the bridge train or average girder three-component coefficient by trains.This paper adopted the inverted trapezoidal steel truss bridge popular in large span railroad to test integral pneumatic force of vehicle-bridge system under different wind attack angles and vehicle-bridge combinations.The overall mean and pulse wind loads of the bridge under vehicle-bridge combinations are compared with the wind load of the bridge alone,so to analyze rules of impact of the total pneumatic force of the vehicle-bridge system by vehicle-bridge pneumatic interference under lateral wind.The results may provide reference for wind load valuing in similar projects.%车辆与桥梁间显著的气动干扰随着大跨桥梁的建设和高速铁路的发展已成为人们关注的焦点,但现有研究大多以汽车或流线型高速列车和钝体简支梁为研究对象,且关注的重点往往是桥上列车的平均风荷载或列车对主梁平均三分力系数的影响.以大跨铁路常用的倒梯形钢桁梁桥为背景,对不同风攻角、车桥组合方式下车-桥系统的整体气动力进行测试,将车桥组合时桥梁受到的整体平均和脉动风荷载与单独成桥状态时的风荷载进行对比,分析横风下车-桥间气动干扰对车-桥系统所受总体气动力的影响规律,研究成果可为类似工程的风荷载取值提供参考.