ANIDIS - L'ingegneria Sismica in Italia, ANIDIS XIX & ASSISi XVII - 2022

Dimensione del carattere:  Piccola  Media  Grande

Structural strengthening of masonry elements by reinforced repointing combined with FRCM and CRM

Francesca Ferretti, Andrea Incerti, Giorgio Giacomin, Fabrizio Tomaro, Vincenzo De Martino, Claudio Mazzotti

Ultima modifica: 2022-08-25


Within the framework of the seismic vulnerability of existing masonry constructions, a current issue is represented by the need of performing structural strengthening interventions to increase or restore the capacity of these buildings to resist seismic actions. Retrofitting solutions are therefore often proposed using innovative materials and techniques. Among the most diffused strengthening techniques, it should be highlighted that they usually consist in applying a reinforcing system covering the entire surfaces of the masonry panels. These solutions are very effective in improving the structural behavior of existing masonry elements, but they are not applicable when the surface of the masonry should remain visible, i.e., in historical buildings. Therefore, other techniques should be adopted, such as the reinforced repointing technique. In this paper, a series of diagonal compression tests are performed on clay brick masonry panels strengthened using different techniques, involving the use of reinforced repointing combined, for few cases, with the application of Fiber Reinforced Cementitious Matrix (FRCM) and Composite Reinforced Mortar (CRM). In more detail, the reinforced repointing technique consists in the use of a continuous mesh made of galvanized Ultra High Tensile Strength Steel (UHTSS) strands positioned inside the horizontal and vertical mortar joints and fixed to the masonry panel through helicoidal AISI 316 stainless steel anchors. The tested masonry panels are strengthened either symmetrically, by using FRCM or the reinforced repointing technique on both sides, or unsymmetrically, by applying the reinforced repointing technique on one side and FRCM or CRM on the other side of the panels. The results of the experimental campaign are discussed in the paper and the improvement given by the strengthening systems is compared with the formulations proposed by Building Codes and technical Guidelines.

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