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| Research on Maximum Temperature Adaptability of Continuously Welded Rail Track on the Symmetrical Continuous Beam Bridge |
| LIU Jian-li |
| China Railway First Survey&Design Institute Group Co. Ltd，Xian,Shanxi710043，China |
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Abstract 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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Received: 06 August 2013
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2013, Vol. 30 
