DISPLACEMENT AT GIRDER END OF LONG-SPAN RAILWAY STEEL BRIDGES AND PERFORMANCE REQUIREMENTS FOR BRIDGE EXPANSION JOINT
Hui GUO 1, 2*, Suoting HU 1, 2, Xiaoguang LIU 1, 2 and Pengfei SU 1
1 Railway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing, China
2 State Key Laboratory for Track Technology of High-Speed Railway, Beijing, China
In-depth understanding of spatial displacement at girder end of long-span railway steel bridges is vital to the design of bridge expansion joint (BEJ). And the performance requirements for BEJ are directly related to the displacement characteristics. In this paper, three different bridge types and corresponding structural restraint system are considered. Results show that the longitudinal displacement at girder end is mainly influenced by bridge types, structural restraint system and effective temperature. In some cases, train loads, longitudinal wind loads, and braking force also have obvious contributions especially for the semi-floating system. Vertical rotation angle at girder end is largely decided by train loads, uneven foundation settlement and temperature. It is also influenced by arrangement of auxiliary piers. Transverse movement and its rotation angle are the key factors deciding the safety and ride comfort of running train at the region of girder end. Two types of BEJs for railway bridges are introduced. Performance requirements for BEJ are proposed according to analysis results.
Displacement; Girder end; Railway steel bridge; Bridge expansion joint (BEJ); Performance