In order to analyzing the vehicle-track coupling vibration character of infinite length track, a time-varyingmodel of railway tangent track spatial vibration was presented.
针对无限长轨道上车辆轨道耦合振动响应特性，建立了铁路直线轨道结构空间振动模型。
2
The mathematic expressions of temperature stress and dry shrinkage stress are deduced. The time-varyingmodel based on multiple factors of concrete face stress is established.
推导了温度应力分量和收缩应力分量的数学表达式，建立了面板应力多因素时变分析模型；
3
For peak load unit, its process model and structure parameters have obviously fast time-varying characteristic while load changing.