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列车驶经桥跨时,桥梁结构在列车移动荷载的作用下发生振动,桥梁结构的动力响应大于列车荷载静止地施加于梁上所引起的静力响应。在桥梁设计中通常采用静力方法,并通过冲击系数计及列车荷载的动力影响。冲击系数
When the train passes by the bridge, the bridge structure vibrates under the action of the train moving load. The dynamic response of the bridge structure is greater than the static response caused by the train load being applied to the beam. In the bridge design usually static method, and through the impact coefficient to account the dynamic impact of train load. Impact factor