A Model for the Prediction of Slippage Reinforcement Bars

Slippage of reinforcement bars has an importance place in the calculation of seismic performance levels of both uncorroded and corroded reinforced concrete buildings. In this paper, empirical models were developed for the prediction of the slip displacement of uncorroded and corroded reinforcement bars at failure as a function of concrete cover depths, strength and corrosion levels. Developed empirical models were derived by considering two different concrete mixes, three concrete cover depths and different corrosion levels of reinforcement bars. Accelerated corrosion method was used to corrode the reinforcement bars which were embedded in concrete specimens. The pullout tests were performed to predict the ultimate bond strength and slip displacement of reinforcement bars. Developed empirical models in this study reflected the bond-slip phenomena particularly at low levels of corrosion where the bond strength improved at low levels of corrosion. The results revealed that developed models showed well relations with the computed experimentally test results.