Andrea Incerti1, Francesca Ferretti2, and Claudio Mazzotti3
1)  CIRI Buildings & Construction, University of Bologna
Via del Lazzaretto 15/5, 40131 Bologna (Italy)
2)  DICAM Department, University of Bologna
Viale Risorgimento 2, 40136 Bologna (Italy)
e-mail: {francesca.ferretti10, claudio.mazzotti}

Keywords: Masonry, Diagonal Compression Test, FRCM, Shear Strength.

Abstract. 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 reinforcement typologies on damaged structural elements. Even though many experimental campaigns 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 limebased 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.