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In this work, a consistent formulation for the representation of concrete behavior before and after cracking\udhas been implemented into a non-linear model for the analysis of reinforced concrete structures, named 2D-PARC.\udSeveral researches have indeed pointed out that the adoption of an effective modeling for concrete, combined with an\udaccurate failure criterion, is crucial for the correct prediction of the structural behavior, not only in terms of failure load,\udbut also with reference to a realistic representation of crack initiation and development. This last aspect is particularly\udrelevant at serviceability conditions in order to verify the fulfillment of structural requirements provided by Design Codes,\udwhich limit the maximum crack width due to appearance and durability issues. In more details, a constitutive model\udoriginally proposed by Ottosen and based on non-linear elasticity has been here incorporated into 2D-PARC in order to\udimprove the numerical efficiency of the adopted algorithm, providing at the same time an accurate prediction of the\udstructural response. The effectiveness of this procedure has been verified against significant experimental results available\udin the technical literature and relative to reinforced concrete beams without stirrups failing in shear, which represent a\udproblem of great theoretical and practical importance in the field of structural engineering. Numerical results have been\udcompared to experimental evidences not only in terms of global structural response (i.e. applied load vs. midspan\uddeflection), but also in terms of crack pattern evolution and maximum crack widths

A non-linear procedure for the numerical analysis of crack development in beams failing in shear