铁路桥梁设计过程中，尤其是高墩铁路桥梁结构，为了满足规范规定的墩顶刚度标准，下部结构往往体量大，经济指标不合理，且有些非标准大跨度桥梁结构墩顶刚度取值并没有标准可以执行。桥上无缝线路轨道力与铁路桥梁下部结构刚度有着密切联系，互相影响。文章以梁轨相互作用原理为依据，通过建立常用跨度简支梁及其桥上无缝线路共同作用的有限元模型，探究轨道力与墩顶刚度的关系，分析墩顶刚度合理取值的判别标准。结论表明：在保证无缝线路轨道结构和桥梁结构受力安全的前提下，墩顶刚度取值可以适当减小，并给出了非标准跨度简支梁墩顶刚度取值的计算方法和控制标准。%During the design of railway bridge, in order to meet the pier top stiffness specified in the code, especially for the high pier railway bridge structure, the scale of the substructure is always large, therefore, the economic index is un-reasonable. Even there is no code for pier top stiffness of special long-span bridge structure. The track force of jointless line on the bridge interacts with stiffness of substructure. Based on interaction principle between beam and rail, FE mod-el acted by simply-supported beam with common span and jointless line on the bridge is established to investigate the re-lationship between track force and pier top stiffness and analyze the determination standard of reasonable pier top stiffness value. The results show that the stiffness of substructure can be decreased properly on the premise of ensuring the stress safety of jointless track structure and bridge structure. At last, in this paper, the calculation method and control standard are put forward to determine the pier top stiffness value of special-span simply-supported beam.
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