The resonant vibration for a simply supported girder bridge under high-speed trains

The dynamic response of a girder bridge under high-speed trains is studied, with an emphasis on the resonant vibration. Two dynamic models for the vehicle are presented to predict the dynamic response of the girder bridge. In the first model, the vehicles are simplified as a series of moving loads. In the second model, the vehicle-bridge interaction system is considered. The results show that the resonance for small and medium-span girder bridges may occur under a high-speed train consisting of a number of vehicles with similar types, and the resonance is caused by the free vibration. The main factors that influence the resonant vibration are investigated; the relations of resonance speeds to the parameters of the girder bridge as well as the vehicle are given. (C) 1999 Academic Press.