短波随机不平顺对列车-板式无砟轨道-桥梁系统动力特性影响  

Influence of short-wave random irregularity on the dynamic characteristics of train-slab track-bridge system

作　　者：徐庆元[1] 

机构地区：[1]中南大学,湖南长沙410075

出　　处：《土木工程学报》2011年第10期132-137,共6页China Civil Engineering Journal

基　　金：国家自然科学基金(51178469);铁道部科技开发计划项目(2008G031-17-1)

摘　　要：运用弹性系统动力学总势能不变值原理及形成矩阵的"对号入座"法则建立列车-板式无砟轨道-桥梁竖向振动方程组。分析列车高速运行时,短波随机不平顺对列车-板式无砟轨道-桥梁系统动力特性的影响,并对不同种类不平顺对列车-板式无砟轨道-桥梁系统动力特性的影响进行对比研究。研究表明:短波随机不平顺对车体垂向加速度、钢轨位移、轨道板位移、桥梁位移影响很小;短波随机不平顺对轮轨垂向力、钢轨垂向振动加速度、轨道板垂向振动加速度、扣件竖向压应力、CA砂浆竖向压应力有很大的影响;短波随机不平顺对钢轨最大弯矩、轨道板最大弯曲应力、桥梁振动加速度也有一定的影响。为了降低短波随机不平顺的危害,高速铁路定期打磨钢轨十分重要。A finite element model of rail-slab track-bridge vertical vibration was put forward, with the vibration equations formulated by using the principle of total potential energy conservation in elastic system dynamics and the ＂set-in-right- position＂ rule for matrix formulations. Using high-speed train passing slab track on bridge as an example, the influence of short-wave random irregularity on the vertical vibration responses of train-slab track-bridge system were studied with comparison between short-wave random irregularity and other types of irregularities. The calculation results show that： short-wave random irregularity has little effects on the vertical acceleration of vehicles, vertical displacements of rail, slab and bridge, while the influences on the vertical accelerations of rail and slab, vertical pressures on fastener and C A mortar are significant. In order to reduce the unfavorable effects of short-wave random irregularity, it is important to grind the rail in time.

关 键 词：板式无砟轨道 动力特性 有限元 铁道工程 短波随机不平顺 

分 类 号：U211.3[交通运输工程—道路与铁道工程] U238