Abstract—In order to investigate the influence of the pier height change due to thermal effect on train riding performance for long span concrete continuous rigid frame bridge, a full scale model is established and its free vibration analysis is performed. Then the spatial vibration responses of train-bridge coupling system are analyzed considering two temperature conditions, e.g. normal condition and 20oC thermal difference. Consequently, the vertical and lateral stiffness of the bridge and the vehicle riding performance are verified according to the evaluation indices. The results show that: (1) For both calculation conditions, the longitudinal and transverse displacement of the bridge is within the limit as well as the acceleration, which means that the influence of the pier height change due to thermal effect is negligible; (2) Under the condition of 20oC thermal difference, with CRH2 and CRH3 high-speed train passing through, the indices for the vehicle, including derailment coefficient, wheel unloading rate and lateral wheel-rail force, are within the limit and similar to the results obtained under normal condition; (3) Under the condition of 20oC thermal difference, with CRH2 and CRH3 high-speed train passing through, the lateral and vertical Sperling Index is comparable with the results from normal condition, and all the results can meet the requirement, which means that the influence of the pier height change on vehicle riding comfort can be neglected; (4) The obtained results can be a useful reference in the dynamic design for similar railway bridge.
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