高速铁路简支梁桥竖向允许刚度及其分析方法

桥梁竖向刚度的大小将直接影响列行车的舒适性与安全性。本文讨论桥梁竖向刚度问题的三种动力计算模型，指出不考虑车－桥动力耦合作用的简单分析模型虽然能在一定程度上反应车辆共振速度的影响，但对桥梁共振及车－桥耦合作用的影响下能提供真实结果。

The Vertical Deflection Limit and its Analysis Models of Simple-Supported Beam Bridge for High-Speed Railway

The vertical stiffness of birdges directly reflects the running safety and riding comfort when trains pass through bridges.Firstly,this paper compares three dynamic models used to research vertical deflection limit,showing that simple models can reflect the influence of vehicles resonance,but it can't give the real results when bridge resonates or bridge and vehicles resonate at the same time,The bridge-vehicle interaction system can give more accurate results of all the running states,Then,through calculation and comparison,the main factors related to the vertical deflection limit of bridge are found out,and the maximum vertical deflection limits of bridges when running speed higher than 250km/h for two kinds of vehicle models are given.