Pull-Out Strength of Headed Bar According to the Lateral Confinement Effect of Reinforced Concrete Beam-Column Joint

This research is aimed at evaluating pull-out capacity through the pull-out test of the reinforced headed bar, a mechanical anchorage, that can replace standard hook. The reason for the weak standard hook making congestion of bars of beam, which is a problem of the reinforced concrete beam-column joint so that it causes the stress concentration inside the joint. As the variables for this test, the hook type that anchored the reinforced headed bar at the beam-column joint, hoop-reinforced type, and the transverse reinforcement type were selected. The researcher analyzed fracture pattern of the test specimens regarding each variable, and the deformation pattern according to load as well. The results from the comparison of the specimens according to the type of laterally confined bar revealed that, though the type of longitudinal bar and of hoop reinforcement were identical, the yield and maximum load of the test specimen of which type of the laterally confined bar was a cross was high as much as 8% and 9% respectively.