上夹板
One cause is that relative displacement between wheel and track is not considered in existing computing model for train-bridge system vibration, the train is all in safety state, and the whole process of derailment cannot be simulated with the computing model;
其原因在于:(1)用于制定该限值的车桥振动计算模型假定轮轨密贴,列车始终处于安全运行状态,不能计算列车脱轨全过程;
In course of train's braking, wheel load bring pressure to track and bridge structure qua locomotive load.
列车制动过程中,车轮荷载作为移动荷载作用于线路和桥梁结构。
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