Strengthening of masonry structures under compressive loads by FRP strips: Local-global mechanical behaviour

The study investigates the local and global aspects connected to the application of the "bed joint reinforcement technique" by using CFRP (Carbon-Fiber Reinforced Polymer) strips in compressed brick masonry walls. The intervention consists in embedding the strips into pre-cut mortar joints, and in refilling them with suitable mortar (lime-based). Results allowed defining the adhesion and the friction phases of the bonding phenomena and to characterize the anchoring effective length. Simulations on laboratory walls demonstrated the high effectiveness of the application when used for reduction of lateral dilation of cracked masonry. Mechanical, aesthetic and durability performances suggest the technique as very promising for historical masonry rehabilitation.