Behavior of RC exterior beam column joint retrofitted using UHP-HFRC

The performance of beam column joint (BCJ) significantly affects the behavior of RC framed structures during the earthquake. The absence of ductile detailing in pre-seismic designed RC beam column joints lead to a greater extent of damage in the non-linear rotation. The retrofitting offers a greater flexibility to strengthen the damaged beam column joint. However, the limitations of retrofitting materials and the extent of initial damage in RC beam column joint affects the retrofitting performance. Therefore, an experimental investigation is carried out to evaluate the efficacy of ultra high performance hybrid fiber reinforced concrete (UHP-HFRC) in retrofitting, and the effect of initial damage on the performance of (UHP-HFRC) retrofitted exterior beam column joint. Park and Ang [1] damage indices model is used to defining the initial damage as complete, severe, moderate and slight. Exterior BCJ, initially damaged are then retrofitted using UHP-HFRC. The test results indicate that the UHP-HFRC retrofitting increases the load carrying capacity, energy dissipation, and ductility of retrofitted BCJ over control specimen. The initial damage level affects the performance of BCJ, as the initial damage level increases from slight to complete damage, the ductility, stiffness, strength retention at the higher drift, and energy dissipation decreases. (C) 2018 Elsevier Ltd. All rights reserved.