Facultatea de Inginerie Braila

Bridges and viaducts represent vital engineering structures which are component of terrestrial communication lines, therefore reduceing their exposure to factors. Originating from natural or antrophogenic hazards, has no optional character becoming a necesity and a goal of the current modern economy. Combating destructive vibration phenomenon, or in some cases chatastrophic, likely to develop in the absence of control techniques, at the running car or during seismic movement of a bridge (viaduct ), is achived by implementing control systems capable to dissipate the energy accumulated in the system. The main scientific object is to deepen the fondation of methodology for analysis and standardised assessment of dynamic characteristics and the behavior for passive control systems with viscoelastic (rubber) links and the dry friction from the components of bridges and viaducts, after the intense and varied dynamic requests from road traffic and seismic activity. Special emphasis will be on the analysis of passive isolation systems based of rubber, in terms of functional changing parameters, as a result of degradation of viscoelastic links, following dynamic requests from road traffic and seismic activity and the energy value of dry friction systems. Partial objectives that will work to obtain the final result are: theoretical modelling of physical and conceptual bases of the boundary systems, modelling the isolated systems - fulcrum liability-the base, on different variants of physic laws regarding the behaviour of linear and nonlinear viscoelastic systems , using nonlinear vibration technique in diagnosing structural integrity determination, dynamic laws that governs structural movement in the disturbing dynamic action.