板式轨道动力响应分析方法

为了计算在高速车辆移动荷载作用下板式轨道的动力响应, 将轨道板视为线性粘弹性连续支承梁, 将钢轨视为线性粘弹性点支承梁, 将钢轨和轨道板统一划分为有限单元, 基于车辆-轨道耦合动力学理论, 利用弹性系统动力学总势能不变值原理, 建立了高速列车-板式轨道的垂向耦合动力学方程, 计算了车辆通过板式轨道钢轨焊接区短波不平顺时的轮轨动力学响应。仿真结果表明: 与其他成熟仿真方法相比较, 响应变化趋势与幅值基本一致, 表明该方法可行。

Analysis method of dynamic responses on slab track

In order to calculate the dynamic responses of slab track subjected to moving vehicular loads,slab was treated as linear viscoelastic continuously supported beam,rail was modeled as linear viscoelastic discretely supported beam,track and slab were regarded as a whole and represented by using finite elements,vehicle-track coupling dynamics theory and total potential energy principle with stationary value in elastic system dynamics were applied,a vertical dynamic coupling model of high-speed train and slab track was established,its dynamics equations were set up,and wheel and rail dynamic responses at the weld joint of slab track were calculated.Simulation result shows that comparing with existing methods,the variational trends and ranges of their computation results are basically consistent,so the model is feasible.1 tab,5 figs,10 refs.