SEISMIC BEHAVIOR EXPERIMENTAL RESEARCH ON PERFORMANCE ENHANCEMENTS OF RAC COLUMN

Four recycled concrete column models with different proportions were designed and created based on the following recycled concrete frame model. Meanwhile,cyclic loading tests for them were carried out. It was compared the failure pattern,hysteretic behavior,stiffness degradation and ductility of 4 columns with different proportions through the experiment,the silica fume and recycled hybrid fiber effect on seismic behavior of ordinary recycled concrete columns was studied. The result was shown: compared with ordinary recycled concrete columns,cracking load,yield load and the corresponding displacement were increased slightly with incorporation of a single silica fume.But,the ultimate load and displacement were slightly lower. The indexes of seismic performance of ordinary recycled concrete columns could be effectively improved by adding appropriate recycled hybrid fiber.