This paper focuses on the influence of bituminous surfacing on structural behavior oforthotropic steel deck bridges. Presented research work is part of national "Orthoplus"project, funded by French "Agence Nationale de la Recherche" (ANR). A detailedapproach allows taking into account the role of bituminous courses within the globalstructure behavior. First, behavior of bituminous materials is studied. A linear viscoelasticanalysis is proposed, using a rheological model previously developed at the "DépartementGénie-Civil et Batiment" (DGCB) of "Université de Lyon/Ecole Nationale des TravauxPublics de l'Etat" (ENTPE). This model is implemented in a finite element code, allowingfor calculation of road structures and particularly, in our case, orthotropic steel deck bridgestructures. In order to validate this development, in-situ measurements were performed ontwo orthotropic structures. Results presented in this paper were obtained from tests on oneof them, specifically the Millau Viaduct (tallest and longest multiple-span cable-stayedbridge in the world). In addition, laboratory measurements were carried out, consisting in afive-point bending test. Experimental results and simulation outputs were finally compared.In the framework of ANR "Orthoplus" national research project (focusing on the evaluationof the interaction between road surfacing and metal structures of orthotropic bridges duringdesign stage), ENTPE, in collaboration with EIFFAGE Travaux Publics, is developing ageneral 3D linear viscoelastic calculation tool for pavement design. This work, alreadyawarded in 2008 with special "Charles Parey" prize by the French Committee ofPermanent International Association of Road Congresses (PIARC) [1] for its theoreticaldevelopments, is here completed and validated through the performed challengingexperimental campaign, in particular the real-size investigation on the Millau Viaduct.
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