Abstract：Abstract：Research purposes：In the case of the concrete bridge connected to roadbed or steel bridge, with the temperature changes, due to differences in scale-displacement of the beam seams on both sides, the force and track alignment irregularity would be impacted of ballastless track on bridge. Through the establishment of the line, plates, bridges, piers integrated space coupling model, this article analyses the forces of track structure near the beam seams and the influential factors of track alignment irregularity, and confirms the value range corresponding to the main factors, so as to provide theoretical guidance for the subsequent bridge bearings, line spacing design.
Research conclusions：(1) The track plate temperature changes will cause track gauge change, but will not cause the gauge overrun. (2) CA mortar layer and rail friction resistance have a little influence on track alignment irregularity and boss force in vertical and horizontal distribution coefficients and lateral stiffness on the pier, however, temperature change width of the steel beams and distance from transversely fixed bearing to the centerline would have great impact. (3) According to the track alignment irregularity limits, distance limits between lateral movable supports and fixed bearings are determined under different conditions of temperature increase and line spacing the distance, providing theoretical guidance for bridge bearings settings. (4) The research results have been applied to ballastless track design of Chengdu-Mianyang-Leshan Railway.
田春香. 桥梁横向伸缩对无砟轨道的变形影响研究[J]. 铁道工程学报, 2015, 32(3): 25-.
TIAN Chun-xiang. Research on the Influence of Lateral Expansion of Bridge on the Deformation of the Ballastless Track
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