As part of this study, has been developed a numerical method which allows to establish abacuses connecting the\nnormal force with bending moment for a circular section and therefore to predict the rupture of this type of section. This may be for\nreinforced concrete (traditional steel) or concrete reinforced with steel fibers. The numerical simulation was performed in nonlinear\nelasticity up to exhaustion of the bearing capacity of the section. The rupture modes considered occur by plasticization of the steel\nor rupture of the concrete (under compressive stresses or tensile stresses). Regarding the fiber-reinforced concrete, the rupture\noccurs, usually, by tearing of the fibers. The behavior laws of the different materials (concrete and steel) correspond to the real\nbehavior. The influence of several parameters was investigated, namely; diameter of the section, concrete strength, type of steel,\npercentage of reinforcement and contribution of concrete in tension between two successive cracks of bending. A comparison was\nmade with the behavior of a section considering the conventional diagrams of materials; provided by the BAEL rules. A second\ncomparative study was performed for fibers reinforced section.
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