In un precedente articolo sono state illustrate alcune delle problematiche riguardanti le murature aquilane, proponendo anche qualche idea sui possibili interventi di rinforzo. Il presente lavoro prosegue su questa linea di ricerca, mostrando i risultati di test di compressione diagonale condotti recentemente su pannelli ricavati in edifici danneggiati dal sisma del 2009. In particolare, le sperimentazioni hanno riguardato tre pannelli nel loro stato originario e due rinforzati, o come tecnica preventiva o come tecnica di riparazione, mediante un intonaco di malta bastarda armato con una rete in GFRP e connettori in composito. I risultati ottenuti mostrano un notevole incremento di resistenza e l’esperienza condotta ha permesso di ottenere contestualmente indicazioni utili dal punto di vista delle modalità di realizzazione.
This paper is a follow-up of a paper published in this Journal where some typical masonry typologies located in the city of L’Aquila were examined and discussed. Among the techniques available today for the strengthening of un-reinforced masonry (URM) walls, the use of new materials has been designated as an attractive solution and some ideas were presented in the previous paper. This paper presents the results of an experimental program on the shear behavior of URM walls strengthened with near surface mounted (NSM) glass fiber reinforced polymers (GFRP) nets. A total of 5 masonry panels were tested and 2 were reinforced with NSM GFRP nets. A coating made of cement based mortar was used and through holes were drilled for GFRP rebars anchors in order to connect the two external reinforcements of the masonry panels. The results show a significant increase in strength. The experiments carried out allowed to obtain interesting indications for their practical utilization of the studied technique.
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