Effects of corrosion on the bending moment-curvature diagram of post-tensioned concrete elements

High-strength steel strands used in post-tensioned reinforced concrete elements are prone to corrosion leading to reduced strength and ductility. A new resistance model for corroded strands has been proposed, enabling the development of reduction curves for ultimate strength and displacement, that take into account both the longitudinal and transversal corrosion geometry along the strand and the steel material properties. The present paper investigates the effects of corroded strands on the bending moment-curvature diagram of post-tensioned concrete beams. This is evaluated through an equivalent constitutive stress-strain relationship for the steel material resulting from the reduced strength and displacement curves.