Statistical analysis on mechanical properties of FRP materials for structural strengthening

In the last decades Fiber Reinforced Plastic (FRP) have been widely adopted for strengthening and repair of damaged structures. Design indications about the use of FRP materials as external strengthening techniques for structures are available in Italy since 2004, while only in 2015 the Italian Ministry of Infrastructure and Transportation published Guidelines for the qualification of FRP products. This paper summarizes the results of several experimental activities for the qualification of preformed FRP products. Statistical analyses were carried out in order to provide indications on variability of FRP's mechanical properties and assess the reliability of the classes individuated by the Italian guidelines.