English

Abstract

Beam- column joints have been recognized as critical elements in the seismic design of reinforced concrete frames. Numerous studies were conducted in the past to study behavior of beam-column joints with normal concrete. ACI-ASCE committee 352 makes recommendations on the design aspects of different types of beam-column joints, calculations of shear strength, and on reinforcement details to be provided. These recommendations are however not intended for fiber reinforced concrete. This study investigates the flexural behaviour of beam-column junction with steel fibres. Beam - column joint of a multi-storied building has been selected, dimensional analysis was carried out and corner beam - column joint was modeled on 1:4 scale. Control specimens were also cast simultaneously to investigate structural characteristics of concrete under compression, tension and flexural conditions. Ten specimens of beam - column junction were cast, using high performance fibre reinforced concrete (HPFRC), with fibre contents varying from 0, 6, 8, 10, and 12percent by volume. These were tested under loading frame to study the load deformation behaviour, failure pattern and other ductility associated parameters. The typical results illustrate that compressive, tensile and flexural strength values are increased by 78, 144 and 646 percent when compared with their companion specimens of High performance concrete (HPC). Ductility associated parameters also increased significantly, and slurry infiltrated concrete (SIFCON) based HPFRC undergoes small deformation without developing wider cracks. Further, SIFCON based beam column joints impart dimensional stability and integrity to the joints.