The 8th International Congress on Advances in Civil Engineering, Gazimagusa, Cyprus (Kktc), 15 - 17 September 2008, pp.133-140
The aim of this study is to model a reinforced concrete beam by using materially nonlinear constitutive models. In the modeling, two approaches are used. In the first approach, the concrete and reinforcement are modeled as 4-noded quadrilateral elements. In the second approach, the reinforcement is assumed to be uniformly distributed throughout the beam. So, the beam is modeled as a single composite element by increasing the modulus of elasticity of concrete by considering the reinforcement ratio. For these two approaches, elastic- perfectly plastic stress-strain relationship is used. Also, tension is considered. Tension zone of concrete is modeled by using different stress-strain relationship proposed in the literature. For the analysis, a computer program is coded in MATLAB. The results obtained from different cases are presented in terms of load-displacement curves.
Keywords: RC Beam, Nonlinear Analysis, Tension Region, Stress-Strain Relationship.