Fiber reinforced cementitious matrix bond behavior on masonry substrate

In this study, the Multi Pier MP method, previously presented for Fiber Reinforced Polymer (FRP) delamination on masonry substrates, is adapted for the Fiber Reinforced Cementitious Matrix (FRCM) single lap shear behavior. Based on this method, an assemblage of vertical (piers) and diagonal (braces) truss members forms a two-dimensional truss structure, representing the entire composite system, including fibers, matrix, and masonry substrate. Piers and braces carry the normal and shear stresses of the system, respectively. With the help of the materials' axial stress-strain curve, the non-linear behavior of truss members was identified. All possible failure modes, such as rupture, fiber slippage, and matrix shear damage, were considered. Validation on four experimental FRCM reinforced masonry pillars demonstrated that the model can estimate the composite's single lap shear behavior and their failure mechanisms with acceptable accuracy. Additionally, all internal stresses and displacement profiles were obtained across the reinforcements for both elastic and plastic ranges up to failure. Despite its accuracy and comprehensiveness, minimal time was required to implement this method in any commercial code, only needing to address non-linearity in unidirectional elements.