**1. Introduction**

Within a region infrastructure elements such as highways, roads and rails has strategic importance because it determines the economic growth and the level of development for that region. The bridge or viaduct structural types represent special structures that provide access for crossing a river course or a valley, assuring a vital connection between human communities. Therefore, such structures must be kept in operation even when high-magnitude earthquakes occur. To be able to withstand the demands in dynamic regime to which these special structures

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are subjected, the design engineers must consider the use of resistant materials and appropriate dimensioning of the resistance structure. In addition to these methods, special protective systems are being used that can provide structure isolation against destructive dynamic actions. Such systems are successfully used for the endowment of bridges and viaducts worldwide. These protective systems are mechanical systems capable of assuming some of the earthquake energy aiming to dissipate and transform it into another form of energy. Usually, the mounting solution for the dissipating energy devices is interposed between the structural frames of the bridge or viaducts. Therefore, the total energy of the earthquake is not reaching the superstructure being consumed at the isolation system level. An experimental model of the hybrid isolation system is described in this paper. This model consists of a rolling pendu‐ lum system combined with an elastomeric system. The idea of building such a system was to achieve the combined effects of the two systems types represented by rolling dissipative system and elastomeric system. This system has been experimentally tested on a reduced scale structure and the results are shown in the following.
