In this presentation,we are showing the application of methods for assessing the structural capacity of existing reinforced concrete bridges,constructed before the application of European Norms.The safety check presented in the various guidelines includes a structural non-linear analysis,followed by checking especially the deformations and resistance of all piers.In most cases,the superstructure is not significantly involved in the seismic response of the structure,then continues with the controls of the substructure(piles and facades)and the foundations,as well as with the systems of the connections of the structure and those of the interconnection between the structural elements.The structural model reflects the real conditions of the structure,the structural model must contain all the relevant degrees of freedom,characterizing the dynamic response of the structure,the inertia characteristics i.e.the stiffness of the structure,and the superstructure connections.For the case of non-linear analysis,the structural model must be able to follow the development of stresses and deformations of the structure beyond the elastic phase caused by the formation of an increasing number of plastic zones.
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