Three-dimensional numerical modeling of rc beam strengthened in shear with steel reinforced grout (Srg)

A numerical model implemented in a finite element code is proposed; it was adopted to analyze the mechanical performances of the strengthened reinforced concrete beams in shear by SRG system until their collapse. The SRG-to-concrete interface was reproduced by a cohesive model, in particular this model is characterized by three failure modes, the first (mode I) associated to the normal stresses, while the other two (mode II and III) associated to shear stresses. Moreover, as damage contact, in this preliminary work a bi-linear local bond-slip law was adopted. The implemented numerical procedure is verified by a comparison between its predictions and test results in terms of ultimate loads, load-deflection diagrams and crack pattern with respect to the result present in literature.