STRESS - STRAIN RELATIONSHIP FOR THE CONFINED CONCRETE

The objective of this study is to present a numerical analysis of circular and rectangular sections reinforced with longitudinal and transversal bars. In this case, a stress-strain relation of confined concrete is proposed. For the purpose of investigating confinement effect, an effectively confined ratio was introduced. It takes into account the effects according to concrete compressive strength, the ratio and the diameter and the configuration of the transversal bars, the diameter and the ratio of the longitudinal bars and sections geometry. This study provides an empirical stress-strain equation to determine the concrete strength until the peak stress. After the peak stress, two empirical stress-strain equations are proposed for describe the confined concrete behaviour in this case. Comparison with experimental stress-strain curves illustrates the validity of the proposed model.