A relevant aspect in the design of structures under high speed train loads is the dynamical effects associated to the moving loads of the train. In this paper some calculation methods that are usual in the design of high speed train structures are considered. These methods are based on the integration of the motion equations, with or without considering the vehicle–structure interaction. Some applications of the vehicle–structure interaction models are shown in order to analyse the dynamical response of short span bridges, with emphasis in the possible reduction of the
dynamical effects associated to these models. To this end the results obtained using both interaction models and point moving loads are compared. Finally some dynamic analyses of singular bridges in the Spanish high speed lines are presented, showing results of interest for the design of these viaducts. The methodology followed in these calculations corresponds to the Spanish IAPF 2003 code and the Eurocode 1 (EN1991–2).
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