Analyse dynamique de l'interaction pont-vehicules pour les ponts routiers. I. Aspects numeriques

In this paper, a general and efficient procedure for the dynamic analysis of road bridges is presented, that takes into account bridge-vehicle interaction and the road profile in a realistic way. With this approach, the bridge structure can be modeled with a tridimensional finite element method using shell and beam elements. The vehicle model is represented using a discrete method based on Lagrange equations. This method uses the modal superposition technique for the bridge components, with a correction for the displacement based on the method of modal acceleration. The Newmark- beta method is used to solve the movement equations of each bridge and vehicles system and the solution is obtained through an iterative process of the interactive forces between the bridge and the vehicles. A simple academic example is presented to show the validity of the proposed algorithm.Key words: shell, dynamics, finite elements, interaction, bridge, roughness, vehicle.[Journal translation]