Abstract
In nonlinear analysis of reinforced concrete (RC) structures, the behavior in the plastic range is of key importance. However, this modeling is very complex and depends on many factors. This paper presents a simplified procedure that, on the basis of a wide experimental investigation on RC beams and with some hypotheses confirmed in the literature, considers the aspects that emerged in this research and which significantly influence the structural behavior, and, in particular, the curvature: the influence of the height of the compression zone on the ultimate concrete strain; the tension-stiffening in the plastic range; and the influence of shear on the extension of plastic zone. Integration of the mean curvatures along the beams yield plastic rotation values that are in good agreement with experimental results. In particular, a size effect on the rotation capacity was observed, leading to a diminution of the plastic rotation with an increase of the height of the beams having the same percentage of tensile reinforcement.
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