Due to the rail-bridge thermal interaction, the high additional axial force in continuously welded rails on continuous bridges may lead to rail buckling or breaking. However, there is little research on the influence of the location of the fixed bearing of continuous beam on the additional force of rail. In order to study the influence of bridge bearing arrangement on the additional longitudinal force of CWR, the thermal interaction model is established for rail, and simple and continuous beams considering nonlinear stiffness and the methods are proposed to determine the locations of fixed bearings of continuous beams corresponding to the maximum additional forces in rail reaching minimum values. Multiple continuous beams with several different lengths and simple beams with three types of bearing arrangements are taken into account to find the effect laws of the locations of the fixed bearings of continuous beams on the maximum additional forces in rail. The results show that as long as the same number of continuous beams, the ratios of the distances of adjacent two fixed bearings to the distance between the two fixed bearings of the simple beams neighbour to the first and last continuous beams respectively are approximately equal to each other. Furthermore the appropriate locations of the fixed bearings of continuous beams are recommended. The results can guide designing the location of the fixed bearing of continuous railway bridge while reducing the additional axial force in continuously welded rails due to bridge thermal effect.

由于轨桥热相互作用，连续桥梁上的连续焊接钢轨所产生的高附加轴向力可能会导致钢轨屈曲或断裂。但连续梁固定支座位置对钢轨附加力的影响研究较少。为研究桥梁支座布置对连续梁附加纵向力的影响，建立了钢轨热相互作用模型，建立了考虑非线性刚度的简单连续梁，并提出了连续梁固定支座位置的确定方法。对应于钢轨上的最大附加力达到最小值。考虑多种不同长度的多连续梁和三种支座布置方式的简单梁，找出连续梁固定支座位置对钢轨最大附加力的影响规律。结果表明，只要连续梁的数量相同，第一、最后连续梁相邻的简支梁的相邻两个固定支座的距离与两个固定支座之间的距离之比近似相等。其他。此外，还建议了连续梁固定支座的适当位置。研究结果可指导连续铁路桥梁固定支座位置设计，同时减少桥梁热效应对连续焊接钢轨产生的附加轴向力。