连续梁桥上无缝道岔温度力与变形影响因素分析

Analysis of Parameters Influences on the Temperature Force and Displacement of Seamless Turnout on Continuous Beam Bridge

研究目的:桥上无缝道岔是跨区间无缝线路的一项关键技术。分析各种因素对道岔和桥梁的受力与变形的影响,总结出连续梁桥上无缝道岔受力与变形规律,是关系到客运专线运营安全的重要问题。研究方法:通过建立连续梁桥上无缝道岔的有限元计算模型,利用Ansys软件对连续梁桥上无缝道岔进行力学计算并作参数影响分析。研究结果:道岔布置位置和桥墩支座布置形式对系统受力和变形影响较大;增大岔区内道床纵向阻力和扣件纵向阻力,有利于控制道岔的位移;连续梁固定墩刚度增加能有效控制道岔各主要位移,同时能减小基本轨最大附加力;轨温变化幅度对系统受力和变形的影响非常显著。研究结论:道岔应避免布置在梁的端部并且尽量让道岔导轨与梁体反向伸缩;合理设计锁定轨温能有效地改善系统受力状况。

Research purposes： Seamless turnout on bridge is a key technique for CWR track across the station. This paper analyzes the influence of the system＇s force and displacement generated by different factors and summarizes some rules about the force and displacement of the seamless turnout on continuous beam bridge, which are very important for the safety of passenger dedicated line. Research methods ： We established a element model of the seamless turnout on continuous bridge and used the ansys soft to resolve this problem and make a analysis on the Parameters Influences. Research results：The calculation results show that the setting style of seamless turnout and the disposal of supports are important influential factors and the greater fastening resistance and ballast resistance are propitious to control the displacement of the seamless turnout. The calculation results also prove that adding the stiffness of the pier can improve the displacement of the seamless turnout the additional stress of the rail. The amplitude of rail temperature＇s variation has a very important influence to the force and displacement of the system. The rail stress - free temperature should be set reasonably.Research conclusions：We should avoid setting the seamless turnout on the sides of the beams and design a reasonable fastening - down temperature of rail to reduce the force of system.