Dynamic responses of a three-span continuous girder bridge with variable cross-section based on vehicle–bridge coupled vibration analysis

This paper is concerned with the dynamic responses of a three-span continuous girder bridge with variable cross-section under moving vehicular loads based on the vehicle--bridge coupled vibration analysis. Numerical simulation is used to study the bridge response. Moreover, the effects of different parameters on dynamic load allowance (DLA) and vibration accelerations of the bridge and the vehicle body are discussed. From numerical results, it has been proved that the pavement roughness is the most important factor. In addition, the tested value of DLA cannot be compared with the design value directly. Also, the speed and weight of vehicles limitation is not always an effective way to ensure the safety of the bridge. It may provide some theoretical basis for the design and evaluation of dynamic bridge performance and these are important factors for the maintenance of bridge operations.