Title:
On Evaluation of Rotation Capacity for Reinforced
Concrete Beams
Author(s):
Pier Giorgio Debernardi and Maurizio Taliano
Publication:
Structural Journal
Volume:
99
Issue:
3
Appears on pages(s):
360-368
Keywords:
capacity; curvature; reinforced concrete.
DOI:
10.14359/11920
Date:
5/1/2002
Abstract:
In the nonlinear analysis of reinforced concrete (RC) structures, the behavior in the plastic range has a notable importance. The modeling, however, is very complex and depends on many factors. Furthermore, the experimental results are rather scattered. This paper presents a simplified procedure that, on the basis of a wide experimental investigation on RC beams and with some hypotheses confirmed in literature, takes into account the aspects that emerged in the experimental investigation 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 yields plastic rotation values that are in good agreement with the experimental results. In particular, as confirmed by other researchers, a size effect on the rotation capacity is observed: it leads to a diminution of the plastic rotation with an increase of the height of the beams which have the same percentage of tensile reinforcement.