Lou Ping, Cheng Yi-Wei, Li Te, Zhang Xiang-Min
School of Civil Engineering, Central South University, Changsha, Hunan, China.
Key Laboratory of Heavy Railway Engineering Structure of Education Ministry, Central South University, Changsha, Hunan, China.
Sci Prog. 2020 Oct-Dec;103(4):36850420982458. doi: 10.1177/0036850420982458.
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.
由于轨道 - 桥梁的热相互作用，连续桥上无缝线路中的高附加轴向力可能导致轨道屈曲或断裂。然而，关于连续梁固定支座位置对轨道附加力影响的研究较少。为了研究桥梁支座布置对无缝线路附加纵向力的影响，建立了考虑非线性刚度的轨道热相互作用模型，并提出了确定连续梁固定支座位置的方法，使轨道中最大附加力达到最小值。考虑了多种不同长度的连续梁和三种支座布置类型的简支梁，以找出连续梁固定支座位置对轨道最大附加力的影响规律。结果表明，只要连续梁数量相同，相邻两个固定支座到分别与第一和最后一根连续梁相邻的简支梁两个固定支座之间距离的比值大致相等。此外，还推荐了连续梁固定支座的合适位置。研究结果可为铁路连续梁桥固定支座位置的设计提供指导，同时减少桥梁热效应引起的无缝线路附加轴向力。
