Stock Photo: The Underside Of A New Railway Bridge Painted In Gray. Arad County, Romania, Europe
ID 315002140 © Rechitansorin | Megapixl.com
A railway bridge is a bridge designed to carry trains. A railroad bridge is a structure constructed for the exclusive purpose of carrying railroad traffic across an obstruction. Since the construction of the first modern railway bridge in the 1820s, railway bridge engineering has evolved extensively. Railway bridges may experience large vibrations from passing trains if the load frequency of the train coincides with the natural frequency of the bridge. For long and slender bridges on high-speed lines, this may occur within the range of the operational speed. In combination with low inherent damping of the bridge, excessive vibrations during train passage may pose both safety risks and riding comfort issues. One approach to mitigate the response of railway bridges and ensure resilience is to install external damping devices. In this chapter, a generalized theoretical model of a bridge-viscous damper system is derived based on the rotation of the bridge deck around the neutral axis. The dampers are installed horizontally in the vicinity of the roller bearing. A setup for a real-time hybrid simulation is described, in which a numerical model of a bridge is connected to a large-scale magnetorheological damper. From both cases, it is found that the vertical bridge deck acceleration could be significantly reduced, indicating that the proposed installation of the damping devices is applicable.
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KEYWORDS
railway bridge crossing mures river arad county romania europe structure constructed exclusive purpose carrying railroad traffic obstruction construction modern metal experience large vibrations passing trains frequency train coincides natural long slender bridges highspeed lines range operational speed damping excessive passage pose risks comfort issues mitigate resilience external devices chapter bridgeviscous damper system rotation deck neutral axis dampers horizontally vicinity roller bearing setup realtime hybrid numerical largescale magnetorheological cases vertical acceleration installation
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