Abstract

AbstractIn the modern world, many buildings have irregular configurations both in elevation and plan. Such types of buildings are more susceptible to earthquake forces. Beam-column joints are most vulnerable to damages when subjected to cyclic lateral loads. It is necessary to identify the performance of the structures by analyzing the behavior of joint to withstand these forces. To investigate the beam-column joint, a six-story irregular RC building in the seismic zone III (India) was analyzed and one of the exterior beam-column joints at an intermediate story is considered for study. Based on the calculations, six one-third scaled exterior RC beam-column joint specimens detailed as per IS 456 with varying amount of joint hoop reinforcement are prepared and tested under a reverse cyclic loading to study their performance during earthquakes. Among six specimens (all with headed bars) three specimens are equipped with additional ties and two specimens with additional stirrups. From the experimental findings, it is concluded that the confinement of joint using headed bars with different configuration of hoop reinforcement enhanced the overall seismic performance of joint in terms of load-carrying capacity, joint shear strength, displacement ductility and stiffness as compared to the unconfined joint.

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