高速铁路桥上无缝线路附加力的研究

Study on Longitudinal Additional Forces in Continuously Welded Rails on High speed Railway Bridges

通过建立线路与桥梁共同作用力学模型，计算分析桥上无缝线路附加力，给出高速铁路桥上钢轨容许附加应力值。提出桥梁下部结构刚度应有合理下限，或应采取其它措施以使钢轨附加应力满足要求，并指出墩台顶承受的纵向力大于现行的规范取值。

Through building a mechanics model for interaction between rail and bridge and calculating and analysing the longitudinal forces in CWR on the bridge,we obtained limit values of additional rail stress in high speed railway on a bridge.We hold that there should be a reasonable lower limit for the stiffness of bridge substructures.Otherwise,other measures should be taken so as to make the longitudinal additional rail stresses come within the allowable limits.It is also pointed out that the longitudinal force exerted on the top of piers is greater than those stipulated by the current standards for railway bridge.