Effects of track characteristics on dynamic responses of train-bridge systems

High speed trains are an indispensable part of rapid transportation systems in many countries. As the fastest means of transport on the ground, these trains are extremely sensitive to the terrain and track conditions. Geometrical irregularities and mechanical characteristics of the track, together with inconsistencies in the lane (including bridges that support the track) are considered important parameters in defining performance and functionality for a train-track-bridge system. In this work a model for interaction study on such systems is proposed that introduces the skipping effect of load movement on track assembly. In this model the train system is consisted of rigid bodies and the bridge model is based on the modal approach. The prospect of using TMD devices for vibration control of bridge-train system is also provided in the model. For the track system a multi layered model using elastic foundation concept is adopted. Using this model, the roles of track characteristics in behaviour of train-bridge systems have been studied. Results of analyses show a clear distinction between different track technologies in providing performance and functionality for a typical train-bridge-track system. These results also indicate the effectiveness TMD devices in reducing bridge-track responses at resonance speeds.