Influence Of FRCM Retrofitting Systems On The Shear Behaviour Of Pre-Damaged Masonry Panels

In recent years, the Italian territory has been stroke by seismic phenomena of high intensity, which caused great damages, especially in old masonry constructions. Therefore, restoring damaged buildings, with the aim to recover or improve their structural capacity, is a key aspect in the post-seismic interventions. Fiber reinforced composite materials could be used to this purpose. One aspect which is worth to investigate is the application of these rein-forcement typologies on damaged structural elements. Even though many experimental cam-paigns are available concerning the mechanical improvement given by composite materials applied on undamaged structural elements, only few can be found considering strengthening of already damaged elements. The scope of this work is to evaluate the shear response of damaged masonry walls reinforced with Fiber Reinforced Cementitious Matrix (FRCM). In particular, diagonal compression tests were performed on two unreinforced masonry walls realized with clay bricks and lime-based mortar, producing an extended state of damage. Afterwards, the same walls were strengthened with FRCM and subjected again to diagonal compression test. Comparisons between the results of the unreinforced samples and the damaged strengthened ones, in terms of shear strength and post-peak behavior, will be presented.