Doctoral Thesis
DOI
10.11606/T.3.2017.tde-13042017-113433
Document
Author
Full name
Pollyana Gil Cunha Amaral
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2017
Supervisor
Committee
Mazzilli, Carlos Eduardo Nigro (President)
Battista, Ronaldo Carvalho
Calçada, Rui Artur Bártolo
Stucchi, Fernando Rebouças
Title in Portuguese
Análise dinâmica de pontes para trens de alta velocidade.
Keywords in Portuguese
Dinâmica das estruturas
Pontes ferroviárias
Trens
Abstract in Portuguese
Title in English
Dynamic analysis of bridges for high-speed trains.
Keywords in English
Dynamics of structures
Geometric irregularities
High-speed trains
Railway bridges
Abstract in English
This thesis resorts to a simplified methodology of dynamic analysis for the study of vibrations in railway bridges, produced by the passage of a high speed train, associated to the presence of irregularities in the rails. The study started from a vehicle model composed of fifteen degrees of freedom, namely, vertical and lateral displacements, and rotations about the longitudinal, lateral and vertical axes. The dynamic models of the train and the bridge were treated as uncoupled, yet being bound by the interaction train-bridge forces. Thus, the loads from the dynamic model of the train were calculated, adopting initially the hypothesis of rigid and fixed deck and also, considering the presence of geometric irregularities in the vertical track plane. In this work, we considered a case study using the Alfa Pendular vehicle model, evaluating the dynamic response of the train and the structure, considering the effect of the geometric irregularities at the tracks, as well as the presence of the ballast. The interaction forces obtained from the model of the vehicle were applied in a high hierarchy structural model of the bridge, divided into shell finite elements, specifying the forces obtained from the dynamic analysis of the vehicle at each node of the bridge model. To represent the train passage on the bridge, functions were used to describe the bridge-train interaction forces at each node of the bridge model at each time interval, until the entire train had travelled the bridge length. The consideration of rigid and fixed deck was corrected by means of an iterative process, so that the deck displacements obtained for a first determination of the interaction forces were added to the rail irregularities (excitation applied to the train wheels). Thus, it was possible to identify the dynamic response caused both by the moving loading and the geometrical irregularities of the tracks, evaluating the comfort of the passengers inside the wagon. Finally, a reliability study was carried out to evaluate the probability of exceeding the limits established by Eurocode.

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Publishing Date
2017-04-18

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