公铁平层斜拉桥列车-桥梁耦合振动分析

Vehicle⁃Bridge Coupled Vibration Analysis of Same⁃level Rail⁃cum⁃Road Cable⁃Stayed Bridge

针对4线高速铁路和6车道公路平层布置的宜宾临港长江大桥,采用车-桥耦合振动的分析方法研究列车通过桥梁时的走行特性,分析线路位置、车速、双车交会、公路车道荷载等因素的影响。结果表明:单车过桥时线路位置对车辆响应影响较小,不同线路行车引起的桥梁竖向响应接近,但在距离桥梁中心较远线路上行车时,桥梁的横向位移及扭转角较大;双车交会时,完全偏载线路的后行内侧车辆脱轨系数及轮轴横向力最大,完全偏载线路的先行外侧车辆轮重减载率最大,且桥梁响应最大;公路车道荷载会增大列车与桥梁的响应,使得车辆的各项安全指标增加约10%,列车各项安全指标随列车距离公路车道的距离增大而减小。

In view of Yibin Lingang Yangtze River Bridge with four-line high speed railway and six-lane highway laid out on the same level,the vehicle-bridge coupled vibration analysis method was adopted to study the running performance of the train when passing the bridge.The influence of the line position,the train speed,the two trains passing each other and highway lane load were analyzed.The results show that when a single train passes the bridge,the line position has little effect on the vehicle response,and the vertical response of the bridge caused by driving on different lines is close,but when driving on the line far from the bridge center,the transverse displacement and torsional angle of the bridge are large.When two vehicles meet,the latter inner vehicle on the fully eccentric load line has the maximum derailment coefficient and axle lateral force,the former outer vehicle on the fully eccentric load line has the maximum wheel load reduction rate,and the bridge response is the largest.The highway lane load will increase the response of the train and the bridge,and increase the safety indexes of the vehicle by about 10%.The safety indexes of the train will decrease with the increase of the distance between the train and the road lane.