Title: Response of Plain and Reinforced Concrete Structures Under Cyclic Loadings
Author(s): Christian La Borderie, Jacky Mazars, and Gilles Pijaudier-Cabot
Publication: Symposium Paper
Appears on pages(s): 147-172
Keywords: beams (supports); bending; cyclic loads; finite element method; microcracking; models; reinforced concrete; structures; Structural Research
Progressive microcracking and crack closure effects are the most important phenomena which need to be described in finite element calculations of reinforced concrete structures subjected to cyclic or seismic loads. Microcracking produces a loss of stiffness which is usually modeled with continuous damage mechanics. Crack closure effects such as inelastic deformations and stiffness recovery remain features that must be incorporated in the constitutive relations describing the response of concrete under cyclic loadings. These effects are introduced into a novel damage model in a rigorous, consistent fashion. An attempt to derive the constitutive relations for fiber reinforced concrete using this model is also described. The implementation of these constitutive relations into a layered beam finite element code is discussed, and computations on medium-size bending beams and a beam-column joint subjected to cyclic loading are compared with experiments. Although the computational method remains simple and sufficiently fast for engineering applications, the good agreement obtained with test data shows that the constitutive relations capture very well the main characteristics of the behavior of concrete.