Impact of Bearing Friction Resistance on Mechanical Characteristics of Track- bridge System

Based on the proven track-bridge interaction model, taking a (60+100+60) m continuous bridge on the Shanghai-Kunming line as an example and considering the bearing friction resistance, small resistance fastener as well as adjacent structures, the analysis model for the interaction between continuous bridge and track was established. It was investigated that the bearing friction coefficient made an impact on mechanical characteristics of the track-bridge system due to the action of temperature, train braking and earthquake. The main conclusions include: the bearing friction resistance makes smaller impact on the track stress, while greater impact on the longitudinal force of pier; the bearing friction coefficient directly determines the longitudinal force applied to the pier where the sliding bearing is only set; for a large-span continuous bridge, considering the impact of the bearing friction resistance can accurately obtain the force applied to the braking piers and tracks near both ends of the continuous beam; when the bearing friction coefficient increases in the process of operation, both expansion force and seismic force applied to the braking pier of continuous beam also increase.