Compressive stress-strain behaviour of stainless steel reinforcing bars with the effect of inelastic buckling

摘要

The corrosion of steel reinforcing bars due to chloride ingress is the most common cause of premature deterioration of reinforced concrete structures. Stainless steel reinforcement in concrete is a promising solution to address these durability and sustainability issues as it is highly resistant to corrosion from chloride ions, and it does not rely on the high alkalinity of concrete or the presence of concrete cover for protection. Modelling and analysis of the nonlinear behaviour of reinforced concrete structural components relies heavily on the existence of constitutive material models to simulate the stress?strain response of the reinforcing bars and concrete accurately. In this paper, the stress?strain behaviour of stainless steel reinforcing bars with the effect of inelastic buckling is examined experimentally and numerically for the first time. Stainless steel reinforcing bars of 12 mm diameter with various slenderness ratios of austenitic EN 1.4301 and duplex EN 1.4362 grades are tested under tension and compression. A validated finite element model of reinforcing bar in compression is developed which is used to conduct parametric study. A new compressive stress?strain constitutive model for stainless steel reinforcing bars is proposed which is calibrated against the numerical simulation data.