This paper presents a numerical study on the plastic hinge behavior and rotation capacity of hybrid steel-FRP reinforced concrete (SFRC) columns. A meso-scale numerical model was developed to account for the internal heterogeneity of concrete and the bond behavior between concrete and reinforcements. The study investigates failure modes, load-displacement responses, and plastic hinge lengths, comparing SFRC columns with conventional steel-reinforced ones. Results show that SFRC columns with FRP longitudinal bars have an enlarged steel yielding zone and curvature localization due to the low modulus of FRP bars. A parametric analysis was conducted, and a new empirical model was proposed to predict the plastic hinge length and ultimate rotation, validated against test results.

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#NumericalModeling #PlasticHingeBehavior #HybridReinforcement #ConcreteStructures #FRPReinforcement #StructuralEngineering #SFRCColumns

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