In some cases of rehabilitation only the perimeter walls from the an old unreinforced masonry building are kept and a reinforced concrete frame with horizontal reinforced concrete slabs, is placed inside the initial structure. Proper connections are done in order to have cooperation between these two different structural systems. In order to investigate the influence of the connectivity between these systems on the dynamic response of masonry walls, different finite element models of a simple two-story stone masonry building are analyzed in this work. The model of unilateral contact with friction is used for the interface. Dynamic base excitation is applied on the three-dimensional finite element models considering elastic material for the concrete and elastoplastic material model for the masonry. From the results it is shown that the contribution of a reinforced concrete system to a system of structural masonry walls depends on the way of connection between the two systems, the specific characteristics of the dynamic loads like the earthquakes and the direction of loading, in relation with the geometry of the structure (like the existence of openings to the walls).
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