In-plane behaviour of tuff masonry strengthened with inorganic matrix-grid composites

Tuff masonry structures represent a large part of the existing cultural heritage in Mediterranean countries and need to be preserved against earthquakes by reversible strengthening systems. Mortar-based composites can give a crucial contribution to this challenge because they have higher bond to masonry and reduce further disadvantages of resin-based composites. In this paper, diagonal compression tests on tuff masonry specimens before and after the application of an inorganic matrix–grid (IMG) composite are discussed. Three IMG system layouts were investigated: single-side strengthening; single-side strengthening with steel fibre-reinforced polymer (SFRP) ties; and double-side strengthening. The increase in shear strength and ductility was assessed and compared to that of similar strengthening systems.