The present work aims to complement the graphic-interactive tool previously created for modeling and designing reinforced concrete beams and columns, introducing the material nonlinearity in the design. The existant tool is based on the FTOOL program, which didactically allows to model and performs structural analysis in two dimensions, resulting in deflections, reactions ans internal forces. Based on the forces and initial data of the structure such as materials, cross sections and concrete covering, the new tool changes the cross sections stiffnesses to consider the effects of concrete cracking and creep, besides the nonlinear relationships between tensions and deformations. It is necessary to introduce an analysis of the section stiffnesses, which after cracking, in the transition between stages I and II, presents a reduction in its stiffiness, that is evaluated by the secant stiffness from the moment-curvature diagrams. Thus, it is necessary to reevaluate the stiffness of the several sections iteratively, performing the redistribuition of the forces according to the vaiation of stiffness on the structural elements. It is proposed the comparison between the recommendation of NBR 6118 (ABNT, 2014), in its topic 15.7.3, for the approximate consideration of material nonlinearity and the secant stiffness obtained by the moment-curvature relationships, both for columns and beams. So three examples of structures are studied, in which the results obtained for internal forces, reinforcement and displacement are compared.