城市轨道交通可能会引起桥梁振动安全性问题和列车运行平稳性问题。建立精确、快速及通用性较好的车桥耦合计算程序，可对新兴的轨道交通进行振动预测提供借鉴。目前车桥耦合研究中，基于有限元软件建立的桥梁模型，通用性不高；而直接利用空间梁单元建模则无法考虑桥梁面板横向振动差异。采用梁段单元建立桥梁模型，并在MATLAB中建立整个车桥计算程序；以宁波轨道交通一号线为数值模拟对象，将计算结果与实测数据对比验证，最后考虑了不同车速对列车运行平稳性的影响。研究得到，直线运行的状态下，车桥响应都有竖向振动比横向振动受车速影响更大的趋势，且底板垂向加速度幅值最大，比腹板横向及悬臂板垂向振动加速度要显著的多；基于平稳性指标的评价结果比加速度指标更加合理。%Urban rail transportation may cause safety issues of bridge vibration and train running stability. Accurate,fast and better versatile calculation procedures for vehicle-bridge interaction will be very important of predict vibrations caused by new-emerging urban rail transit.The versatility of bridge models based on finite element software was not high,the bridge model established straightly with beam element could not consider the difference between lateral vibrations of bridge panels.Here,the beam segment finite element method was used to build a bridge model and establish a calculation program for the entire vehicle-bridge system in MATLAB;Furthermore,Ningbo Rail Transit Line 1 was taken as a numerical simulation object.The computed results were compared with the measured data.Finally,the influences of different train speeds on the train running stability were considered.The results showed that under the condition of straight-line running,the vertical vibration responses of the vehicle-bridge system are easier to be affected by train speed than its lateral vibration ones be;the vertical vibration acceleration of the bridge bottom plate is the maximum, its amplitude is much larger than that of the beam webs’ lateral vibration acceleration and that of the cantilever plate’s vertical vibration acceleration;the evaluation results based on the train stability index is more reasonable than those based on the acceleration index.
展开▼
