Most reinforced concrete road bridges built in Argentina have their foundations or substructure constructed at the job site. On the other hand, the superstructure typically used consists of precast I-beams with an in situ slab that gives a monolithic connection. These beams are placed on top of elastomeric bearings, so relative movements between the substructure and the superstructure of the bridge may occur at the event of an earthquake. In order to limit these seismic displacements, buffers

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... e constructed. They are reinforced concrete blocks fixed to the substructure. Their design is usually done following approximate hypothesis which, in highly seismic areas, may be very insecure. The aim of this work is to show the improvement made in the dynamic response of the structure of the bridge built in the province of San Juan, Argentina, due to the addition of energydissipating devices. In order to predict the seismic response of the structure, mathematical models have been developed. The energydissipating devices have been tested in the Lab to analyze their mechanical behavior. Results show that the damage over seismic buffers is significantly reduced, and therefore structural security is raised.