时速310 km高速列车过桥诱发大地振动特性分析

Characteristics Analysis of Ground Vibration Induced by High-speed Trains Passing through Bridges at 310 km/h

研究目的:针对高速列车以时速310 km通过桥梁诱发的大地振动问题,利用MATLAB软件建立列车-轨道-桥梁耦合系统动力有限元模型并提取轮轨力,进而将轮轨力施加于三维轨道-桥梁-大地有限元模型中,获取大地振动响应;选择沪昆高铁江西段某高架轨道,现场测试列车高速通过桥梁时诱发的大地振动响应,将有限元仿真与现场测试对比分析。研究结论:(1)有限元分析与现场测试结果在25~80 Hz范围内吻合良好,加速度有效值的最大误差为0.006 m/s^(2),有限元模型满足精度要求;(2)高速列车通过桥梁诱发大地振动的激励源主要是呈周期运动的列车轴荷载,大地垂向振动能量主要集中在3.15~80 Hz频段范围,优势频率为20~63 Hz,随着中心频率增加,加速度振级呈增大趋势;(3)距离桥墩中心线大于20 m,高速列车通过桥梁引起的大地振动低于城市区域环境振动标准65 dB;(4)本研究成果可为高速列车通过桥梁诱发大地振动预测提供参考。

Research purposes:Aiming at the problem of ground vibration induced by high-speed trains passing through bridge at 310 km/h,the dynamic finite element model of train-track-bridge coupling system was established by MATLAB,and the wheel rail force was extracted.Then the wheel rail force was applied to the three-dimensional track-bridge-ground finite element model to obtain the ground vibration response.An elevated track in Jiangxi section of Shanghai-Kunming high-speed railway was selected to conduct field test on the ground vibration induced caused by high-speed trains passing through bridge,and the finite element simulation were compared with the measured results.Research conclusions:(1)The finite element analysis was in good agreement with the field test results at 25~80 Hz,and the maximum error of the effective value of acceleration is 0.006 m/s^(2),which proves that the finite element model meets precision.(2)The excitation source of ground vibration induced by high-speed train passing through bridge was mainly the train axial load with periodic motion,and acceleration vibration level increases with the increase of the center frequency,and the vibration energy was mainly concentrated in 3.15~80 Hz and the dominant frequency is 20~63 Hz.(3)When the distance from the bridge pier center line is more than 20 m,the ground vibration caused by high-speed train passing through bridge was 65 dB lower than the environmental vibration standard of urban area.(4)The research results have reference value for the prediction of ground vibration induced by high-speed trains passing through bridges.