beam and column joints;  oblique rebar;  ductility;  High strength concrete

Aiming at the requirements of limited ductility of components in low-medium seismic damage areas, two new structural forms of reinforced concrete beam and column joints are proposed: oblique steel bars are added in the node area, or the main steel bars of the beam are bent in the node area. They can not only meet the requirements of limited ductility, but also avoid dense reinforcement in the node area. The repeated loading of four high-strength concrete beam and column joints at low cycle shows that the ductility of the two new joints can be improved, and the displacement ductility coefficients of the joints are increased from 2 to 4.2 and 3.3, respectively. The strength of the specimen with oblique steel bar can be increased by 5% in the nodal area, so it is the best joint construction form for the node with limited ductility requirement.