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Please use this identifier to cite or link to this item: http://hdl.handle.net/10362/4286

Título: Critical Velocity obtained using Simplified Models of the Railway Track: Viability and Applicability
Autor: Dimitrovová, Zuzana
Rodrigues, André FS
Palavras-chave: transversal vibration, moving load, moving mass, dynamic stiffness matrix, semi-infinite elements, critical velocity, finite element model.
Issue Date: 1-Jan-2010
Relatório da Série N.º: none
Resumo: Increased demands on the capacity of the railway network gave rise to new issues related to the dynamic response of railway tracks subjected to moving vehicles. Thus, it becomes important to evaluate the applicability of traditionally used simplified models which have a closed form solution. Regarding simplified models, transversal vibrations of a beam on a visco-elastic foundation subjected to a moving load are considered. Governing equations are obtained by Hamilton’s principle. Shear distortion, rotary inertia and effect of axial force are accounted for. The load is introduced as a time varying force moving at a constant velocity. Transversal vibrations induced by the load are solved by the normal-mode analysis. Reflected waves at the extremities of the full beam are avoided by introduction of semi-infinite elements. Firstly, the critical velocity obtained from this model is compared with results of an undamped Euler- Bernoulli formulation with zero axial force. Secondly, a finite element model in ABAQUS is examined. The new contribution lies in the introduction of semi- infinite elements and in the first step to a systematic comparison, which have not been published so fa
URI: http://hdl.handle.net/10362/4286
ISBN: 978-1-905088-38-6
Appears in Collections:FCT: DEC - Documentos de conferências internacionais

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