Analytical tension stiffening model for concrete beam reinforced with inoxydable steel

Abstract

Unlike the conventional carbon steel that has been used widely as reinforcement bars, the usage of Inoxydable steel (Inox) is still limited despite their superior properties in strength and ductility. Hence, limited study has been conducted to determine the structural behavior of Inox including the constitutive law and material model when it is used as reinforcement bars in concrete element. In this study, tension stiffening model is specifically developed for Inox to determine their interaction properties with the surrounding concrete. This study uses constitutive laws developed for Inox from Austenitic type. An inverse method based on combination of results from experimental works and the one obtained from nonlinear numerical analysis (NNA) is applied to determine the parameters involved in the tension stiffening model. The tension stiffening model developed for inoxydable steel is then compared with the conventional carbon steel. Results from this study shows that the inverse method is able to develop tension stiffening model for concrete beam reinforced with inoxydable steel. When compared with carbon steel, tension stiffening for inoxydable steel is 50 percent higher during the cracking phase. Findings from this study; tension stiffening model parameters for inoxydable steel are very useful for modeling works which uses Inox as reinforcing steel bars.