The bond behavior of steel reinforced recycled concrete under cyclic reversed load

In order to investigate the cyclic bond behavior between H-shaped steel and recycled concrete, thirteen cyclic reversed push-out tests and one monotonic push-out test were carried out. The main parameters of the tests were recycled concrete aggregate (RCA) replacement percentage, thickness of concrete cover, stirrup ratio, recycled concrete strength and loading scheme. The experimental results indicate that the pinch effect on the hysteresis curves of load-slip is remarkable. The envelope curves can be divided into four stages: minimal slip stage, slip development stage, falling stage and residual stage. The bond stress of steel reinforced recycled concrete (SRRC) under cyclic reversed load declines by 40%similar to 50% comparing to SRRC under monotonic push-out load. Slip appears on both ends of the specimens firstly under cyclic reversed load. The influence of the main factors on the cyclic bond stress is analyzed. The energy dissipation mainly occurs in the falling stage and residual stage.