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| Research on the Mechanical Properties of Elastic Restraint System of Railway Long-span Continuous Beam Bridge |
| WANG Dezhi, YAN Aiguo, WEN Wangqing, YANG Dewang, ZHANG Zheng |
| China Railway Siyuan Survey and Design Group Co. Ltd, Wuhan, Hubei 430063, China |
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Abstract Research purposes： The prestressed concrete continuous beam widely used in China's railway generally adopts a fixed restraint system, that is, a longitudinal fixed bearing is set, and the rest are longitudinal movable bearings. In this paper, the longitudinal elastic restraint system of railway long-span continuous beam bridge is studied for the first time, the basic principle of elastic restraint system and the calculation method of bearing stiffness are introduced, the concept of combined stiffness of continuous beam substructure is proposed, and the temperature deformation zero point of beam, the stress of bridge substructure, the earthquake resistance of bridge and the stress of track are analyzed.Research conclusions： (1) The longitudinal elastic restraint system of continuous beam is the coordinated force of multiple main piers, and by selecting the appropriate elastic support stiffness, the temperature deformation zero point of the continuous beam can be better controlled near the middle of the middle span, and the temperature joint length of the beam can be effectively reduced. (2) The horizontal force and track telescopic force of the fixed constraint brake pier of the continuous beam are reduced, and the track stress is reduced by about 24%. (3) The horizontal and longitudinal combined stiffness of the substructure is reduced, the self-vibration cycle of the bridge structure is prolonged, and the seismic performance of the structure is improved. (4) The technical achievements can be popularized and applied on the long-span continuous beam of the railway.
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