Abstract
As trains are getting faster rapidly, it is necessary to adjust RC railroad viaducts and their components for coping with structure noise. In this study, th e authors conducted a train running test to grasp the vibration characteristics of the slabs of actual RC beam viaducts and RC rigid frame viaducts, in order to clarify the vibration characteristics of the components of RC railroad viaducts, which are necessary for evaluating and predicting structure noise. Then, it was found empirically that an RC beam viaduct has a vibration mode of the intermediate slab around 130Hz, and this mode becomes remarkable when a train passes. It was also revealed that in the case of an RC rigid frame viaduct, several vibration modes of the intermediate slab are excited in the frequency range over 50Hz and the second-order mode of the middle slab becomes significant around 60Hz when a train passes.
