城市轨道交通长大桥梁上无缝线路钢轨制动力研究

On the Rail Braking Force of Continuous Welded Rail on Long-span Bridge in Urban Rail Transit

为了保证城市轨道交通长大桥梁上无缝线路的稳定性与安全性,要特别关注列车制动/起动所引起的钢轨与桥梁的相互作用,检算由此产生的钢轨附加力。钢轨所受制动力的大小直接影响着钢轨强度检算和桥墩纵向刚度的取值。采用空间耦合有限元计算模型对列车制动作用下长大桥梁无缝线路钢轨制动力进行研究。通过比较不同工况条件下的钢轨制动力,得出计算制动力时可采用的最不利工况。

For the sake of stability and security of the con- tinuous welded rail on long-span bridge in urban rail transit, the interaction between rail and bridge shall be con-cerned about specially, which is aroused on account of train braking and starting, and the rail additional force shall be checked. The rail strength test and the pier longitudinal ri- gidity are influenced directly by the rail braking force, based on the spatial coupled finite element calculation mod-el, the rail braking force of continuous welded rail on long-span bridge in the action of braking is researched. By comparing the rail braking forces in different conditions, the worst condition that could be accepted in calculation is obtained.