基于梁端残余变位的高铁列车震后行车安全评价方法

Riding safety evaluation method of high-speed railway trains based on beam end residual displacement after earthquakes

地震后受损桥梁的行车安全问题直接关系到抗震救灾生命线能否贯通。通过数值模拟得到4种典型梁端残余变位形式对应的轨道变形曲线,将其作为轨道不平顺施加到轨道上,建立了车轨耦合振动模型。分析了不同程度的4种梁端变位对以不同车速行驶的高铁列车行车安全的影响。通过二分法逼近的方式确定了不同车速下脱轨系数和轮重减载率超限时对应的4种梁端残余变位界限值,通过将震后梁端残余变位响应值(计算值或观测值)与限值进行比较,可在无需进行车轨桥耦合振动分析的情况下对高铁列车震后行车安全做出快速评价。

Riding safety of the damaged bridges after earthquakes plays an important role on the operation of earthquake relief lifeline.The track deformation curves corresponding to four types of typical beam end residual deformation are obtained through numerical simulation.The vehicle-track coupled vibration model is established by considering the track deformation curves as static track irregularities.Investigations are made of the influence of different degrees and different types of beam end displacements on the traffic safety of high-speed railway trains at different speeds.The dichotomy method is used to determine the limit values of the 4 types of beam end residual displacement corresponding to different vehicle speeds when the derailment coefficient and wheel unloading rate reach the limit values.By comparing the responses(calculated or observed)of the beam end displacements after earthquakes with the limit value,the traffic safety of high-speed railway trains can be evaluated without the need of making vehicle-track-bridge coupling vibration analysis.