高速铁路轨道-桥梁-土体系统的振动传递特性试验研究  

Tests for vibration transmission characteristics of a high-speed railway track-bridge-soil system

作　　者：李小珍[1] 陈桂媛 朱艳 赵宇 LI Xiaozhen;CHEN Guiyuan;ZHU Yan;ZHAO Yu(Department of Bridge Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学桥梁工程系

出　　处：《振动与冲击》2019年第17期58-64,72,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(51378429;51878565)

摘　　要：针对列车在250~385 km/h高速运行时的轨道、桥梁和地面振动开展现场测试。分别采用连续小波变换、1/3倍频程分频振级和环境振动评价标准对测试数据进行分析,研究振动自轮轨接触处产生,在轨道、桥梁和土体中的传递特性。结果表明:各测点的振动响应均表现出冲击振动特性,地面振动的峰值频率受列车周期性轮轴激励频率和轮轨力峰值频率的影响;桥梁、地面振动响应受到相邻两节车的影响,故建模分析时可仅考虑少数几节车;箱梁、墩顶和地面的总体振动加速度级随车速的增加率分别为0.33、0.52和0.22 dB/(10 km/h);箱梁和墩顶振动的优势频段为31.5~125 Hz,地面振动的峰值频率为40~50 Hz;地面振动随距离的衰减规律符合3次多项式,在测试车速范围内,距离桥墩15 m之外的地面总体Z计权振动加速度级小于80 dB。Excited by high-speed trains running at speed range of 250-385 km/h,vertical vibration accelerations of track,bridge and ground surface were recorded through in-situ measurements.The continuous wavelet transform theory,the 1/3 octave frequency division vibration level and the environmental vibration evaluation criterion were adopted to analyze the measured data.Transmission characteristics of vibration generated at wheel/rail contact points and then propagating in track,bridge and soil were studied.Results show that vibration responses at different measuring points exhibit impact vibration characteristics;peak value frequency of ground vibration is affected by train’s periodic wheel-shaft excitation frequency and peak value frequency of wheel/track interaction force;vibration responses of bridge and ground are affected by two adjacent carriages,so only several carriages can be considered for modeling analysis;increasing rates of overall vertical vibration acceleration levels of box-girder,pier top and ground are 0.33,0.52 and 0.22 dB/(10 km/h),respectively;box-girder and pier top vibrations have a dominant frequency range of 31.5-125 Hz,ground vibration has a peak value frequency range of 40-50 Hz;ground vibration has a cubic polynomial decay law versus distance from pier;within the measured train speed range,the overall Z-weighted vibration acceleration level of ground with a distance of 15 m away from pier is smaller than 80 dB.

关 键 词：高速铁路 高架桥 箱梁振动 地面振动 现场实测 

分 类 号：U441.2[建筑科学—桥梁与隧道工程] O329[交通运输工程—道路与铁道工程]