研究目的:我国地域辽阔，各地区地理环境差异显著，桥梁跨度以及环境气候复杂程度都已经远超过德国和日本，相应桥上无缝线路设计所面临技术难度是国外所不具备的，现有桥上无缝线路检算虽精度较高，但必须每桥一算，在项目决策阶段检算工作量较大。为简化无缝线路的检算工作，本文提出利用近似公式对无缝线路强度进行定性检算，为项目初期桥梁温度跨度设计提供指导性建议。
研究结论:通过对对称连续梁不同温度跨度钢轨应力的检算总结出齐齐哈尔、西安、成都三地不设钢轨伸缩调节器的最大温度跨度。(1)铺设常阻力扣件:齐齐哈尔地区，直线段最大温度跨度小于120 m，曲线段小于120 m;西安地区，直线段最大温度跨度小于130 m，曲线段小于120 m;成都地区，直线段最大温度跨度小于 180 m，曲线段小于150 m;(2)铺设小阻力扣件:齐齐哈尔地区，直线段最大温度跨度小于160 m，曲线段小于 130 m;西安地区，直线段最大温度跨度小于 220 m，曲线段小于170 m;成都地区，直线段最大温度跨度大于 220 m，曲线段大于220 m;(3)本文所得出的结论可适用于对称连续梁，桥墩纵向线刚度在3 000 kN/cm左右的直线及曲线地段。
Research purposes: China is vast in territory，with huge difference in temperature from the north to south. The bridge span and the climate condition in China are longer and more complicated than those in Japan and Germany. As a result，the difficulty in design of continuously welded rail track in China is unique. Although the calculation accuracy of continuously welded rail track on bridges is very high，but the calculation must be done for every bridge. So there are lots of the calculation works to be done in the decision一making phase of the project. In order to simplify the calculation works，this paper presents a approximate formula to calculate the strength of continuously welded rail track and gives out a guidance suggestion about the design of the bridge span temperature.
Research conclusions : Based on the calculation of the track stress of the symmetrical continuous beams in different temperature spans，this paper summarizes the maximum temperature span in the Qiqihar, Xi an and Chengdu regions where it is unnecessary to install the rail overlapping device.(1)For installing the regular resistance fastening，the maximum temperature span in straight line section is less than 120 m and in curve section it is less than 120 min Qiqihar, the maximum temperature span in straight line section is less than 130 m and in curve section it is less than 120 m in Xian and in Chengdu，the maximum temperature span in straight line section is less than 180 m and in curve section it is less than 150 m.(2)For installing the low resistance fastening，in Qiqihar, the maximum temperature span in straight line section is less than 160 m and in curve section it is less than 130 m，in Xi an，the maximum temperature span in straight line section is less than 220 m and in curve section it is less than 170 m and in Chengdu，the maximum temperature span in straight line section it is more than 220m and in curve section it is more than 220 m. (3) The conclusion obtained in this paper is available for the symmetrical continuous beam and the bridge pier with the longitudinal stiffness of about 3 000 kN/cm in the straight and curve sections.
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