Abstract
A theoretical model incorporating the moving train, the railway track, and the elevated viaduct is established and then solved using periodic theory in this paper. The vertical wheel/rail forces and the dynamic responses of track and viaduct girder are obtained and compared for three different types of tracks, i.e., the double-block ballastless track, the rubber-pad floating slab track, and the steel-spring floating slab track. It is observed that the rubber-pad and steel-spring floating slab tracks can reduce more than 10% of the wheel/rail force and the reaction force at girder supports, when compared to those of the double-block ballastless track. Especially, the steel-spring floating slab track develops an uplifting force larger than the installation force of the fastening clip, which may cause failure of the rail fastening system.
Highlights
Due to the ever-increasing demand on public transportation services, China has seen a rapid development of urban rail transit (URT) lines in its major cities, e.g., Beijing, Shanghai, Nanjing, and Hangzhou
In order to compare with the published results, our model presented in Figure 3 is reduced by setting large bending rigidity to the girder beam and the slab beam and setting large stiffness to the girder supports, so that the rigid ground and rigid sleeper can be simulated
Discussion e SSFS track, of heavier slabs floating on resilient layer of lower stiffness, is most effective in reducing dynamic loads at girder supports, which will be transmitted to the pier, the foundation, and the ground. us, the SSFS track would be the most suitable one in viewing of controlling environmental vibrations generated by the elevated railway lines
Summary
Due to the ever-increasing demand on public transportation services, China has seen a rapid development of urban rail transit (URT) lines in its major cities, e.g., Beijing, Shanghai, Nanjing, and Hangzhou. In viewing of modeling environmental vibrations induced by trains moving on elevated tracks, existing studies generally adopt over-simplified track models by either neglecting the elastic track components (e.g., the rail is connected to the bridge deck directly [20]) or by integrating the elastic properties of the track directly into the bridge [21]. To this aim, a periodic unit of three layers of beam that simulates the rail, the slab, and the bridge girder, respectively, is proposed and solved analytically for a moving train loading.
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