Study on Dynamic Performance and Safety of Vehicle-Track-Bridge System of Continuous Steel Truss Bridges for Long Span High Speed Railway

Abstract

With the continuous improvement of high-speed train speed and railway bridge span, the safety of long-span high-speed railway vehicle-bridge-track coupling system has attracted extensive attention of bridge workers. In order to study the safety of high-speed railway long-span bridges and running trains, this study established a vehicle-bridgetrack multibody dynamics model of a five-span continuous steel truss high-speed railway bridge, the finite element model was revised based on the measured data of the bridge, and the vibration response of the key positions of the revised bridge model is in good agreement with the measured data, which proves that the established model can well represent the mechanical performance of the actual bridge. Based on the theoretical model, the influence mechanism of train speed and track irregularity on the vertical displacement and acceleration of mid-span section of the bridge, dynamic amplification factor are studied. Then the train safety and stability indexes and the bridge vibration response evaluation standards were used to evaluate the safety of bridge and train under various train speed and track irregularity operating conditions. This has certain guiding significance for the safety and rational design of the long-span high-speed railway vehicle-bridge-track coupling system.