Research and Discussions on Trackbridge Integration Designs for Kilometerlevel Railway Bridges

Abstract: The spatial displacement of kilometer-level railway bridges under the action of environment and train loads directly affects the condition of the upper track. Conducting researches on the basic theory, methods and key technologies of track-bridge integration design is crucial for achieving high-quality development of long-span railway bridges. By summarizing the engineering practice in the integrated design of the existing kilometer-level railway bridge and analyzing the experience from the previous track-bridge integrated design, the results indicate that in the design of the kilometer-level railway bridge based on “stiffness control”, the influence of beam deformation on the track geometry shall be considered in detail by properly setting up bridge profile and precamber;when determining the spatial displacement of the beam-end area, rational consideration should be given to the load combination, the deep-going study on the displacement limit should be carried out, and the integrated design of rail expansion joint adjuster and beamend expansion device shall be completed through the collaboration of the designers from bridge and track disciplines; and for bridge, track and beam-end areas, the static acceptance criteria for bridge alignment, track geometry and beam-end expansion devices shall be studied and formulated respectively.