Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Dynamic performance of existing double track railway bridges at resonance with the increase of the operational line speed
HighlightsEvaluation of acceleration levels in short/medium simply supported railway bridges.Influence of (1) vertical flexibility of the bearings and (2) transverse vibration modes.Numerical analysis of a representative ensemble of railway bridges.
AbstractThis article addresses the dynamic behaviour of double track simply supported bridges of short to medium span lengths (10m<L<25m) belonging to conventional railway lines. These structures are susceptible to experience inadmissible levels of vertical vibrations when traversed by trains at high speeds, and in certain cases their dynamic performance may require to be re-evaluated in case of an increase of the traffic velocity above 200km/h. In engineering consultancies, these structures have been traditionally analysed under the passage of trains at different speeds using planar models, neglecting the contribution of transverse vibration modes and also the flexibility of the elastomeric bearings. The study presented herein endeavours to evaluate the influence of these two aspects in the verification of the Serviceability Limit State of vertical accelerations, which is of great interest in order to guarantee a conservative prediction of the dynamic behaviour. In the present study, the dynamic response of representative slab and girder bridges has been evaluated using an orthotropic plate finite element model, leading to practical conclusions regarding the circumstances under which the above mentioned factors should be considered in order to adequately evaluate the transverse vibration levels of the deck.
Dynamic performance of existing double track railway bridges at resonance with the increase of the operational line speed
HighlightsEvaluation of acceleration levels in short/medium simply supported railway bridges.Influence of (1) vertical flexibility of the bearings and (2) transverse vibration modes.Numerical analysis of a representative ensemble of railway bridges.
AbstractThis article addresses the dynamic behaviour of double track simply supported bridges of short to medium span lengths (10m<L<25m) belonging to conventional railway lines. These structures are susceptible to experience inadmissible levels of vertical vibrations when traversed by trains at high speeds, and in certain cases their dynamic performance may require to be re-evaluated in case of an increase of the traffic velocity above 200km/h. In engineering consultancies, these structures have been traditionally analysed under the passage of trains at different speeds using planar models, neglecting the contribution of transverse vibration modes and also the flexibility of the elastomeric bearings. The study presented herein endeavours to evaluate the influence of these two aspects in the verification of the Serviceability Limit State of vertical accelerations, which is of great interest in order to guarantee a conservative prediction of the dynamic behaviour. In the present study, the dynamic response of representative slab and girder bridges has been evaluated using an orthotropic plate finite element model, leading to practical conclusions regarding the circumstances under which the above mentioned factors should be considered in order to adequately evaluate the transverse vibration levels of the deck.
Dynamic performance of existing double track railway bridges at resonance with the increase of the operational line speed
Moliner, E. (Autor:in) / Martínez-Rodrigo, M.D. (Autor:in) / Museros, P. (Autor:in)
Engineering Structures ; 132 ; 98-109
14.11.2016
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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