Mechanical Analysis and Arrangement Study of REJ for CWR on Cable-stayed Bridge

Research purposes: Compared with the common railway bridge, the interaction between the bridge and rail on cable-stayed bridge with large span and long beams is more complicated. There is little related research and engineering application of continuous welded rail (CWR) on the long span cable-stayed bridge. Especially, the research on the interaction between structures, mechanical behaviors and optimal arrangement of rail expansion joints (REJ) are relatively inadequate. In this paper, based on the Anqing - Jiujiang Railway Yangtze River Long-span Cable-stayed Bridge, the spatial coupling model of CWR on bridge is established and the design schemes of CWR on the bridge are studied and analyzed. Research conclusions: (1) Due to that temperature span of cable-stayed bridge is large and the REJ is not used, the rail strength and track stability cannot meet the requirements of the standards when the whole bridge is laid with constant and small resistance fasteners. (2) In order to reduce the interaction between the beam and rail, two sets of one-way REJ are arranged at both ends of the main beam. (3) Switch rail of REJ should be arranged on the continuous main beam with constant resistance fasteners. The stock rail is located at the simply supported beam of the side span. Small or constant resistance fasteners can be laid on the stock rail side. (4) The research can be used as reference for design and checking, structural optimization and arrangement of REJ for CWR on cable-stayed bridge. © 2018, Editorial Department of Journal of Railway Engineering Society. All right reserved.