A numerical study on the b shape factor of the shear strength criterion of unreinforced masonry panels

After summarising the failure criteria for unreinforced masonry panels provided by the new Italian technical law (NTC 2008), the paper presents a numerical study aimed to investigate the b shape factor. This shape factor is a coefficient used to evaluate the ultimate shear strength of masonry panels for the failure mechanism with diagonal cracking. The numerical results show that the computed values of the coefficient b are higher than those proposed by the rules. Consequently, the shear strength obtained applying the equation given by the NTC 2008 does not appear conservative.

Michele Betti, Luciano Galano, Michele Petracchi, Andrea Vignoli