ANALYSIS ON SEISMIC PERFORMANCE OF STEEL REINFORCED CONCRETE L-SHAPED COLUMN SPACE CORNER JOINTS

In order to study the seismic performance of steel reinforced concrete L-shaped column space corner joints, low-cycle reversed loading tests and finite element simulations for 8 specimens were carried out. It indicated that the results of the numerical analysis exhibited a good agreement with those of experiments. While considering three parameters based on the above results, which were the column section steel form, load angle and axial compression ratio, the influences of the three parameters on the seismic performance indicators including the peak load, energy dissipation capacity and displacement ductility were analyzed by using Abaqus nonlinear finite element simulation. Suggestions for engineering design reference were proposed. The results indicated that the failure pattern of steel reinforced concrete L-shaped column space corner joints is dominated by compression-shear and flexural failure, followed by torsion and bond failure. The overall seismic performance of the solid web steel specimen is the best, with its peak load increased by 10% as compared with hollow steel specimens. While increasing the axial compression ratio, the displacement ductility of the specimens with different forms of steel was decreased by different degrees, with solid web steel specimens declining slowly. A value of 0.5 was suggested for the axial compression ratio limit for design. Moreover, when the load angle is less than 45°, the peak load increased while the energy dissipation and ductility decreased gradually with the increase of the load angle. The peak load and the ductility coefficient of the 45° loading specimens were increased by about 30% and decreased by 10% as compared with the 0° loading specimens, which is the most disadvantageous loading direction.