Design parameters of track-bridge interaction on passenger dedicated line cable-stayed bridge

Track-bridge interaction was simulated by using nonlinear spring, and the simulation method was proved based on the experimental results of related documents. Taking a U-shape section and single-tower cable-stayed bridge on Shanghai-Kunming Passenger Dedicated Line as an example, the spatial finite element model of tower-cable-rail-beam-pier was established by using large general-purpose finite element software ANSYS. The transfer law of rail longitudinal force on cable-stayed bridge was analyzed, and the impacts of design parameters on rail longitudinal force were studied, the design parameters included longitudinal resistance model, cable-stayed bridge structure system, temperature load, wind load and so on. Analysis result shows that rail longitudinal resistance can be simplified in accordance with ideal elastic-plastic model. Compared with floating system, rail longitudinal force reduces by about 30% through tower and beam consolidation. When calculating rail expansion force, load can be applied according to beam increasing-temperature 15°C and cable increasing-temperature 40°C. In windy areas, rail longitudinal force on cable-stayed bridge caused by wind can be larger than 60 kN.