Bond strength of corroded reinforcement under cyclic loading Available to Purchase

Structures located in seismic zones require significant ductility. It is valuable to investigate the relationship between bond stress and slip displacement. Cyclic loading can result in severe deterioration in the bond between reinforcing steel bar and the surrounding concrete, especially when the reinforcement is corroded. Tests have been carried out under cyclic loading to investigate the bond stress–slip response of corroded reinforcement with concrete. The results showed that the rate of bond reduction had been lowered by corrosion. Bond reduction was significantly less for deformed bars than for smooth bars during the first loading cycle, but the difference was substantially decreased after ten cycles. Bond reduction was more substantial for unconfined steel bars than for confined ones. The relatively high level of corrosion caused reduction in bond primarily in the initial five cycles and the effect of corrosion was decreased with the number of loading cycles. It was also demonstrated that the shape of loading and unloading branches on the bond stress–slip curves as well as the reduced envelopes depended on loading history.