The effect of the application of strengthening systems in form of polymeric grids embedded in inorganic matrix on masonry elements is not easy to assess and represents a fundamental issue with respect to the preservation of masonry buildings in seismic areas. In addition, recent seismic codes do not provide specific criteria for assessment of existing masonry walls reinforced with such type of technique. In this paper the main results of experiments carried out on unreinforced and reinforced masonry panels with mortar layers strengthened with composite grids are briefly described. The reinforcement, made of polymeric grids, was applied in a symmetric way on both sides of the panels. The panels were tested against in-plane actions with refer to a combination of a vertical static load and a horizontal cyclic load. Successively, a Finite Element Model (FEM) of the unreinforced and reinforced masonry panels has been employed in order to: 1) assess some mechanical parameters of the materials influencing the global non-linear response of the panels in their plane, and 2) evaluate the efficiency of such a strengthening system.
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