Influence of track modelling in modal parameters of railway bridges composed by single-track adjacent decks

Abstract

A significant number of railway bridges composed by simply-supported (SS) spans are present in existing railway lines. Special attention must be paid to short to medium span length structures, as they are prone to experience high vertical acceleration levels at the deck, due to their low weight and damping, compromising the travelling comfort and the structural integrity. The accurate prediction of the dynamic response of these bridges is a complex issue since it is affected by uncertain factors such as structural damping and complex interaction mechanisms such as vehicle-bridge, soil-structure or track-bridge interaction. Concerning track-bridge interaction, experimental evidences of a dynamic coupling exerted by the ballasted track between subsequent SS spans and also between structurally independent single track twin adjacent decks have been reported in the literature. Nevertheless, this phenomenon is frequently disregarded due to the computational cost of models including the track and due to the uncertainties in the mechanical parameters that define the track system. The present work contributes to the study of the coupling effect exerted by the ballasted track in railway bridges composed by SS adjacent decks. With this purpose a 3D finite element (FE) track-bridge interaction model is implemented with a continuous representation of the track components meshing the sleepers, ballast and sub-ballast with solid FE. The numerical model is updated with experimental measurements performed on an existing railway bridge in a view to evaluate (i) the influence of the track continuity on the bridge modal parameters and (ii) the adequacy of the implemented numerical model.