EXPERIMENTAL STUDY ON SEISMIC BEHAVIOR OF STEEL REINFORCED CONCRETE COLUMNS UNDER DIFFERENT LOADING SYSTEMS

Quasi-static loading tests of three SRC columns were conducted to compare the seismic behavior of SRC columns under different loading systems. The results showed that under the far-field loading system, the damage degree of specimen deepened, the bearing capacity of specimen decreased and the energy dissipation capacity of specimen enhanced with the increase of equal displacement cycle number; the cycle number had little effect on seismic behavior as the drift ratio was less than 1/50, and had significant effect on seismic behavior at the drift ratio 1/40; the ultimate deformation,one-cycle hysteresis energy dissipation and equivalent viscous damping coefficient reaching ultimate displace of specimen were small, the ductility and ultimate energy dissipation capacity of specimen were poor. Under the near-field loading system, the crack number of specimen was small and the concrete crushing area of specimen was large, the bearing capacity of specimen was reduced greatly after enduring the initial ultimate displacement loading, and the energy dissipation capacity of specimen was developed fully; the ultimate deformation,one-cycle hysteresis energy dissipation and equivalent viscous damping coefficient reaching ultimate displace of specimen were large, the ductility and ultimate energy dissipation capacity of specimen were strong; when loading against with increasing displacement, the bearing capacity and energy dissipation capacity of specimen had little change as the drift ratio was less than 1/50, and the bearing capacity of decreased sharply and the energy dissipation capacity increased rapidly at the drift ratio 1/40.