桥上无缝线路附加力计算模型

中国新建铁路桥上无缝线路设计及墩台顶纵向力计算暂行规定尚处于试行阶段，有些地方还很值得探讨，其中之一就是其常量阻力计算模型。从理论上证明以该力学模型计算桥上无缝线路伸缩附加力，当跨径很大时，有可能不存在有力学意义的解，并结合实例加以说明．当荷载较小时，以该力学模型计算挠曲附加力，也有可能不存在有力学意义的解，以三跨连续梁为例．对该问题进行了论证。针对常量阻力计算模型的缺点．建议对大跨度铁路桥梁应采用变量模型。

Computation model of additional longitudinal forces of continuously welded rails on bridges

The temporary design criterion for computation additional longitudinal force between rail and abutment and pier on CWR bridge is still being studied at present in China,there are many items, which are deserved to discuss, one of them is the constant longitudinal resistance mechanics model. It is proved that additional flexible longitudinal force, which has the mechanics meaning, is probable not to exist for the long-span bridge with the model. When the load is light, the mechanics meaning solution for the additional winding force is also probably not exist with the model. Because of the shortcomings of the constant model, the variable longitudinal resistance mechanics model should be adopted on the long-span railway bridge. 4 figs, 8 refs.