Seismic Rehabilitation of Reinforced Concrete Building Corner Joints

Three half-scale reinforced concrete building corner joints were rehabilitated externally with carbon FRP composites and tested under quasi-static, cyclic loads. The rehabilitation goal was to improve joint shear capacity and displacement ductility. The three joints had steel reinforcement details typical of non-ductile concrete buildings. Two of the specimens were reinforced with hoop steel in the joint, while one specimen did not have any hoop steel reinforcement. Two of the specimens, one with and one without hoop steel were tested with an axial column load of 0.lf′ _cA_g. The third specimen, with hoop steel, was tested with a column load of 0.25f′ _cA_g. The performance of the rehabilitated specimens is compared to that of six baseline specimens, four with hoop steel in the joint and two without hoop steel. The comparisons include hysteretic behavior, joint shear stress, and joint shear strength coefficient as defined by ACI-352. Two different failure modes were observed for the CFRP composite rehabilitated joints. The shear capacity of the rehabilitated joints with hoop steel was slightly improved in comparison to the baseline. The rehabilitated joint without hoop steel showed even more improvement in shear capacity and in addition the displacement ductility was increased significantly.

• INTRODUCTION

• TEST SPECIMENS

• TEST SETUP

• EXPERIMENTAL RESULTS

• COMPARISON AND CONCLUSION

• ACKNOWLEDGMENTS

• REFERENCES