(48+80+48)m连续梁桥与轨道系统地震响应规律研究

为研究高速铁路连续梁桥-轨道系统地震响应规律,采用非线性弹簧模拟线路纵向阻力,建立考虑轨道及下部结构的(48+80+48)m连续梁桥-轨道系统仿真模型,分析温度、活载和制动作用下桥上无缝线路梁轨相互作用纵向力分布规律,在此基础上,研究地震作用下连续梁桥-轨道系统动力响应特性。研究表明:温度、活载及列车制动作用下梁轨相对位移、钢轨应力等均在桥台附近取得极大值,地震频谱特性对梁轨系统动力响应有很大的影响。

Research on Seismic Response of (48+80+48) m Continuous Girder Bridge and Track System

To investigate seismic response rule of high-speed rail continuous girder bridge and track system,this paper uses nonlinear spring to stimulate longitudinal impedance of railway line to build a stimulation model for( 48 +80 +48) m continuous girder bridge and track system,and analyzes the rule of longitudinal force distribution on the jointless track under the effects of temperature,live load and braking. On this basis,further study is conducted on the response characteristics of dynamic system under the influence of seismic action. The research results show that the relative displacement between beam and rail and the rail stress gain their maximums respectively near the abutment under the effects of temperature,live load and braking,and the frequency spectrum of earthquake has a bigger impact on dynamic responses of beam-rail system.