It is presented that there is a critical speed which will make the trend of dynamic response change when the train passes through the transition section.

• 同时提出随行车速度的提高,必存在一个临界车速使得列车在通过路桥过渡段时,其动响应(动应力、动应变、动位移、振动加速度等)变化总趋势发生改变。