Influential parameter analysis on vibration responses of rigid-frame viaducts induced by running high-speed trains

摘要

This study is intended to clarify the parametric influence for the vibration responses of rigid-frame viaducts in both vertical and lateral directions caused by running high-speed trains. A developed 3D numerical analysis approach considering trainbridge interaction is applied to investigate the vibration characteristics of rigid-frame viaducts. The analytical model is composed of the high-speed train model with multi-DOFs vibration system for each car and the rigid-frame viaduct model with three bridge blocks. They are linked by an assumed wheel-rail relation through the rail model considering the simulated track irregularities. By using the analytical model, the parametric study is carried out. The impact factors including train speed, train type, track irregularity, rail type and damping are investigated and identified as significant variables. The analytical results are significant and give some instructive information regarding the impact factors of the train-bridge system which could be much helpful for the mitigation of vibration and the maintenance in the high-speed railway.