Abstract
Resonance is a phenomenon of utmost importance in railways engineering, leading to vast damages both in track and vehicles. Thus, to avoid the undesired effect of resonance, it must be studied, understood and predicted. To this aim, in the current study a FE model able to reproduce the dynamic behavior of a real stretch of track has been developed and its correct behavior has been calibrated with real data. Furthermore, different measures of mitigation have been proposed and its effect on displacements and vibrations in the mid-span section of a railway bridge have been evaluated.
Highlights
The dynamic response of a track subjected to the passage of a train is a complex phenomenon, whose understanding is of utmost importance to maximize track quality, minimize its maintenance needs and to assure its safety
The importance of the dynamic response of the track is even higher when it is built over a railway bridge, since resonance conditions may be reached
The present paper aims to assess the dynamic response of a real short-span bridge, whose dominant frequencies are excited by the passage of a train
Summary
The dynamic response of a track subjected to the passage of a train is a complex phenomenon, whose understanding is of utmost importance to maximize track quality, minimize its maintenance needs and to assure its safety. The phenomenon of resonance takes place when frequencies similar to the eigenfrequencies of the bridge are induced by the passage of the train These frequencies may be associated to the distance between adjacent wheelsets, the distance between adjacent sleepers or irregularities in the wheel-rail contact among others. The dynamic response of a railway bridge is influenced by numerous factors, such as structure natural frequencies and damping, train speed or the length of both the structure and the train Within this context, [3] studied the influence of different parameters, including the bridge-to-carriage length ratio. The present paper aims to assess the dynamic response of a real short-span bridge, whose dominant frequencies are excited by the passage of a train.
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