南京长江大桥128 m钢桁梁上列车走行安全性分析

京沪线南京长江大桥128 m简支钢桁梁在提速货物列车通过时,其横向振幅很大,远远超过我国《铁路桥梁检定规范》规定的限值,涉及到该梁上列车走行的安全性。针对这一问题,运用桥上列车脱轨能量随机分析理论,对该梁上列车走行的安全性进行计算和分析,结果表明:当货物列车以不超过80 km/h速度通过该梁时,车桥系统横向振动是稳定的不会脱轨,列车走行安全性有保证。此结论符合现场实际情况,为该桥未采取限速措施提供了充分的理论依据。

Safety analysis of train running on the 128m simple-supported steel truss girder of Nanjing Yangtze-River Bridge

When speed-up freight train passes the 128m simplesupported steel truss girder of Nanjing Yangtz River bridge on Beijing-shanghai line,the transverse vibration amplitude of the girder is larger than the limitation specified in the code for rating existing railway bridge of China and derailment is likiely to occur.Thus,the calculation and analysis of train running safety on the girder are made.And the main conclusion is as follows: when the freight train passes under the speed of 80km/h,transverse vibration of train-bridge time variant system is stable.That is,the train will not derail,and the train running safety on the girder is guaranteed. This conclusion,which corresponded to the fact,offers sufficient the oretical basis for the fact that there is no speed limit on this bridge.