Masonry existing structures are prone to significant structural damages when subjected to seismic actions. Over the last decades, innovative techniques emerged as attractive solutions for repair and retrofit of structures. In particular, composite materials with inorganic matrix (FRCMs-CRMs) have emerged as an alternative to fiber reinforced polymers for their better compatibility with masonry substrates. The effectiveness of the strengthening relies on the FRCM-substrate bond behavior, which needs to be characterized for the design of the reinforcement elements. Shear bond tests are able to determine the stress-slip law and the failure mode that rules the FRCM-substrate stress transfer capacity. In the last years, several experimental investigations on shear bond tests of strengthened masonry prisms were performed even if the knowledge about the influence of each variable parameter is not fully known. In this context, the numerical simulation may be a rapid and economic tool to study the incidence of the most relevant parameters in the bond mechanism. In this paper, a numerical study aimed at simulating the fiber-mortar bond behavior and at calibrating a shear stress (τ)-slip (s) constitutive bond law, is presented. Advanced 2D numerical models, able to simulate the most probable failure mode occurring in shear bond tests, have been developed. The results of the numerical simulations have been compared with the experimental results of a large database of tests on FRCM/CRM strengthened masonry prisms. An inverse analysis procedure has been used to fit the experimental bond stress versus slip curves and to predict the failure modes.
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