Research on Seismic Performance of 735 MPa High-Strength Reinforced Concrete Frame Joints

To study the seismic performance of high-strength reinforced concrete frame joints, cyclic loading tests were carried out on six beam-column joints configured with new Cold-rolled Ribbed Bar (CRB) 735 steel reinforcement and one joint Hot-rolled (HRB) 400 ordinary to obtain effects axial compression ratio stirrup in core joints. The test results show that following: (1) Increasing can improve energy dissipation characteristics CRB735, but cannot effectively ultimate shear capacity Larger will cause earlier cracks area reduce ductility specimens by 6.1~27.9%. (2) increase 5.3~8.1% while also increasing failure displacement 2.8~14.9%. (3) When are CRB735 stirrups, rate stiffness degradation from cracking yielding stage be delayed. (4) Compared HRB400, process using is shorter, yield load higher, close state when they reach yield. Finally, calculated relevant equation GB50010-2010 Code for Design Concrete Structures, has a certain safety reserve. In equation, strength recommended MPa.