Investigations for Simplified Consideration of Train-Bridge-Interaction based on Railjet High-speed Train

The interaction between bridge structure and vehicle has an important effect on railway bridges. Numerous research studies of recent years have shown that especially for the majority of structures - varying from short to medium span (up to 30-35 meters) - the influence of this interaction can play a significant role on the dynamic behavior of the structure. The simplified consideration of the interaction by additional damping according to the Eurocode, which depends on bridge span, has been found incorrect for some cases of bridge structures. The reason for this is that the complex mechanism of the vehicle-bridge interaction depends on the totality of factors, such as vehicle-bridge-mass ratio, vehicle-bridge-frequency ratio or vehicle-bridge-length ratio. By the bridge span alone, this mechanism is only restricted describable. For the Railjet high-speed train a simplified method to consider train-bridge-interaction by approximating a detailed multi-body train model from the results of a moving loads model is shown.