Approches expérimentales et numériques pour l'analyse dynamique d'un pont routier

ABSTRACT This paper presents different aspects related to the application of dynamic analysis to bridge structures. Two particular aspects are exposed and applied to the case of an existing prestressed concrete box-girder bridge. At first, a modal analysis is performed. The structure is modeled using three dimensional finite elements and the computed modes are compared to those obtained from in situ experimental measurements. Thereafter, a complete dynamic analysis is done by time integration in order to simulate as precisely as possible the bridge behaviour. This computation takes into account the real dynamic interaction between the vehicles and the deformed structural model with an added roughness to the road surface. The results are then compared to those provided by field measurements. After such a validation of the model behavior, a parametric study of the dynamic amplification factor based on Monte Carlo generation of different parameters is presented.