无砟轨道约束对高速铁路列车-桥梁系统地震响应的影响

Influence of ballastless track constraint on the seismic responses of high-speed railway train-bridge system

建立了38自由度高速列车(动车/拖车)空间振动模型,基于非线性Hertz接触理论和Kalker线性蠕滑理论,引进PEER-NGA强震记录,建立地震作用下的高速铁路列车-无砟轨道/钢轨-桥梁-支座-桥墩-桩土系统精细计算模型,考虑支座刚度和桩土作用及近场地震效应的影响,以高速铁路32m跨简支箱梁桥和CRTSⅡ板式无砟轨道为研究对象,编制了MATLAB程序,计算了有/无砟轨道约束下高速列车-桥梁时系统的地震响应。计算结果表明,不考虑三层无砟轨道时列车-桥梁系统模型由于桥梁刚度过大,列车-无砟轨道-桥梁系统的各项地震响应较列车-钢轨-桥梁系统有较大增加;对于有/无地震作用时,采用无砟轨道均可有效改进列车走行性能,近断层地震脉冲效应对有/无砟轨道约束系统动力响应及列车走行安全指标影响均较大。

The high-speed train （motor car/trailer car） model with 38 DOFs was build up,based on the nonlinear Hertz contact theory and the Kalker creep theory,the strong earthquake records of PEER-NGA were introduced,the fine model of the high-speed train-ballastless track/rail-box girder-bearing-pier-pier-soil were established in this paper,the influence of bearing and pile-soil dynamic interaction were considered,CRTSⅡslab ballastless track and 32 m span simply-supported box girder bridge were studied,the MATLAB software was developed to calculated the seismic responses and train-running safety during earthquake of high-speed railway train-bridge system,and the comparative analysis was carried out.The calculated results show that,the seismic response of the system were larger compared with the high-speed train-ballastless track-bridge system,the constraint influence of the ballastless track can not be ignored,the ballastless track can effectively improve the train-running safety behavior of vehicle with/without earthquake action;the pulse like fault earthquake can significantly affected the responses of high-speed railway train-ballastless track-bridge system and train-running safety.