Performance Evaluation of Exterior Beam–Column Joint with Core Reinforcement Technique Subjected to Reverse Cyclic Loading

Abstract

The present work aims to study the performance of exterior beam–column joint with core reinforcement technique subjected to reverse cyclic loading. In this experimental study, three sets of one-third scaled exterior beam–column joint specimens using M30 grade concrete were cast and tested. The first set of specimens were detailed as ordinary moment resisting frame (IS:456 and SP:34) and designated as joint BCJ1. The second sets of specimens were detailed as special moment resisting frame (IS:13920) and designated as joint BCJ2. In the third set, the reinforcement detailing followed in joint BCJ1 was integrated with a new type of reinforcement (called “core reinforcement”) proposed in this study and designated as joint BCJ3. Based on the experimental result, the joint BCJ3 gave the better performance considering the strength in terms of load-carrying capacity, energy dissipation capacity, stiffness and ductility factor. The results of reverse cyclic loading tests performed in the exterior beam–column joint models indicate that the additional core reinforcement in the beam–column joint region provide adequate ductility. The stiffness of the joint with additional core reinforcement in the beam–column joint region did not undergo much reduction when compared to other types of joints. In addition, the usage of core reinforcement in the joint region can reduce its installation and difficulties in placing and compacting the concrete. This combination of core reinforcement technique in the beam–column joint region may contribute to reduction in destruction due to earthquakes.