Stress-strain model for confined concrete with corroded transverse reinforcement

This paper presents an experimental study on the stress-strain relation of confined concrete that considers the corrosion effects of transverse reinforcement. The main variables are the corrosion level of transverse reinforcement, cross sectional shape of confined concrete, as well as arrangement and configuration of confining transverse reinforcing bars. The test results revealed that four key parameters of the complete stress-strain relation are significantly affected due to the corrosion of transverse reinforcement, including the maximum concrete strength and corresponding axial concrete strain, maximum concrete strain at the fracture of the first hoops, and descending branch of the stress-strain curve after exceeding the maximum strength. Based on the test data and regression analysis, the empirical equations to estimate these key parameters are proposed, and a complete stress-strain model for confined concrete with corroded transverse reinforcement is developed. The proposed model showed good correlation with the test data of both circular and square specimens with various corrosion levels and subjected to compression axial loading.