The paper shows the results obtained during experimental campaign of diagonal compression tests in Tuscany, in which a significant number of masonry panels were tested. The aims of this research are mainly two. On the one hand the authors compare medium values of shear strength and shear stiffness varying the knowledge level proposed in the OPCM 3431 code (LC1, LC2 and LC3). On the other hand, the authors verify shear strength and stiffness range value, given by OPCM 3431 code for masonry typology most recurring in Tuscany (Italy).
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