Improvement and Evaluation of Seismic Performance of Reinforced Concrete Exterior Beam-Column Joints Retrofitting with Fiber Reinforced Polymer Sheets and Embedded CFRP Rods

Gee-Joo Ha Young-Joo Ha Hyun-Wook KangAbstractIn this study, experimental research was carried out to evaluate and improve the seismic performance of reinforced concrete beam-column joint regions using strengthening materials (CFRP sheet, AFRP sheet, embedded CFRP rod) in existing reinforced concrete structure. Therefore it was constructed and tested seven specimens retrofitting the beam-column joint regions using suchretrofitting materials.Specimens, designed by retrofitting the beam-column joint regions of existing reinforced concrete structure, were showed the stable failure mode and increase of load-carrying capacity due to the effect of crack control at the times of initial loading and confinement of retrofitting materials during testing.Specimens LBCJ-CRUS, designed by the retrofitting of CFRP Rod and CFRP Sheet in reinforecd beam-column joint regions were increased its maximum load carrying capacity by 1.54 times and its energy dissipation capacity by 2.36 times in comparison with standard specimen LBCJ for a displacement ductility of 4 and 7. And Specimens LBCJ-CS, LBCJ-AF series were increased its energy dissipation capacity each by 2.04~2.34, 1.63~3.02 times in comparison with standard specimen LBCJ for a displacement ductility of 7.Keywords : Embedded CFRP rod, CFRP sheet, AFRP sheet, Beam-column joint, Seismic performance, Retrofitting, Improvement