000013226 001__ 13226
000013226 005__ 20161114160332.0
000013226 04107 $$aeng
000013226 046__ $$k2009-06-22
000013226 100__ $$aMartinez-Rodrigo M., D.
000013226 24500 $$aPractical aspects related to the retrofit of railway bridges under high-speed traffic

000013226 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013226 260__ $$bNational Technical University of Athens, 2009
000013226 506__ $$arestricted
000013226 520__ $$2eng$$aThis contribution deals with the application of Passive Control techniques to mitigate the excessive vibrations that short simply-supported railway bridges may undergo under the circulation of High-Speed trains. A possible solution to reduce inadmissible levels of deck vertical acceleration, based on retrofitting the bridge with fluid-viscous dampers connected to the slab and to an auxiliary structure, is proposed and evaluated. To this end, a real bridge belonging to the Spanish railway network is analysed using an orthotropic plate Finite Element model, which properties are updated from experimental tests performed on the structure in the past. A possible conditioning of the line for a higher Design Velocity than the current one is considered, leading to an inadmissible performance of the bridge. A particular retrofit is proposed in order to accomplish the Serviceability Limit State of vertical acceleration, and the controlling effect of the proposed system is shown for a wide range of trains and circulating velocities. In order to realistically assess the technical feasibility of the alternative, special attention is given to practical aspects related to the auxiliary structure and dampers connection to the original bridge deck.

000013226 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013226 653__ $$arailway bridge dynamics, resonance phenomena, moving loads, fluid-viscous dampers, passive control, orthotropic plates Abstract. This contribution deals with the application of Passive Control techniques to mitigate the excessive vibrations that short simply-supported railway bridges may undergo under the circulation of High-Speed trains. A possible solution to reduce inadmissible levels of deck vertical acceleration, based on retrofitting the bridge with fluid-viscous dampers connected to the slab and to an auxiliary structure, is proposed and evaluated. To this end, a real bridge belonging to the Spanish railway network is analysed using an orthotropic plate Finite Element model, which properties are updated from experimental tests performed on the structure in the past. A possible conditioning of the line for a higher Design Velocity than the current one is considered, leading to an inadmissible performance of the bridge. A particular retrofit is proposed in order to accomplish the Serviceability Limit State of vertical acceleration, and the controlling effect of the proposed system is shown for a wide range of trains and circulating velocities. In order to realistically assess the technical feasibility of the alternative, special attention is given to practical aspects related to the auxiliary structure and dampers connection to the original bridge deck.

000013226 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013226 720__ $$aMartinez-Rodrigo M., D.$$iLavado, J.$$iNasarre, J.
000013226 8560_ $$ffischerc@itam.cas.cz
000013226 8564_ $$s1617781$$uhttps://invenio.itam.cas.cz/record/13226/files/CD317.pdf$$yOriginal version of the author's contribution as presented on CD, section: Dynamic effects on high-speed railway tracks - i (MS).
000013226 962__ $$r13074
000013226 980__ $$aPAPER