ANCHORAGE BEHAVIOR OF 90-DEGREE HOOKED BEAM BARS IN REINFORCED CONCRETE WALL-BEAM INTERSECTIONS

摘要

Experiments were conducted to determine anchorage performances of 90-degree hooked beam bars in a joint at which a beam intersects a structural wall at right angles. Seven wall-beam joint specimens that had some variations in the arrangements of wall reinforcement and L-shaped beam bar anchorage were used in the experiments. All of the specimens subjected to pullout loading on the beam bars failed in beam bar anchorage. The anchorage strength increased as the amount of wall reinforcements increased, especially when the wall reinforcement was arranged in the direction of thickness as tie bars. The following results were obtained: (1) the inclusion of many tie bars made the zone of transmission stress become wider and the anchorage strength increase, (2) the anchorage strength of hooked bars without tie bars increased by only 10% even though spacing of wall bars was reduced by 50%, and (3) accurate estimation of anchorage strength was possible by considering the dowel action of wall bars.