Cristian-Silviu SIMIONESCU, Adrian LEOPA


Abstract: Bridges and viaducts must ensure the road land connection between two points, even after some seismic actions. Avoiding or reducing potential total or partial destruction of these structures can be achieved by placing seismic systems between superstructure and bridges infrastructure. The natural aging of rubber as component of laminated rubbers anti-seismic bearings determined changes in horizontal and vertical stiffness. The paper presents a study based on actual data of the dynamic behavior of a seismic loaded bridge whose deck is isolated by visco-elastic laminated rubber bearings. In order to determine the bridge superstructure response depending on the insulation systems stiffness modification caused by natural aging of rubber four Vrancea (Romania) earthquakes records sets were used for loading the bridge superstructure. The conclusion of the study shows that a low classified earthquake ground motion can determine a more intense structural response compared to that induced by a normal classified earthquake ground motion in terms of using a poorly adjusted insulation system and the impact of core material aging effects.
Key words: bridge, earthquake, isolation bearing, rubber, aging, dynamical response

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