Viscoelastic Moment-Curvature Diagrams

In this paper, a computational viscoelastic analysis method of sections in reinforced concrete is presented. This study examines the stress-strain history in the interval of time considered. A nonlinear constitutive law for concrete, elastoplastic constitutive law for steel, and a heterogeneous cracked section are considered. The creep behavior of concrete is described by means of the AAEM method, suitably adjusted and used in an iterative process. The proposed method can be used for the plotting of bending moment-curvature diagrams with a given axial load. The diagrams contain a set of curves, each relative to an interval of time. The use of these diagrams allows the determination of the strain and stress field at any time and the study of the evolution in time of the bearing capacity of the structures in reinforced concrete