A STUDY ON STRENGTH AND DUCTILE BEHAVIOR OF EXTERIOR BEAM-COLUMN JOINT USING HYBRID STEEL FIBRES

In this paper, the strength and ductility characteristics of the exterior beamcolumn joint with the addition of the hybrid steel fibres have been studied. From the past earthquake studies, it revealed that the failure of the beam-column joint mainly occurs due to the reduction of its moment carrying capacity and shear strength during the earthquake. This may be due to the provision of ordinary reinforcement in the joints and concrete which behaves as brittle materials. In this study, two sets of exterior beam-column joints were designed as per IS1893code procedures and detailed as per IS 13920 recommendations for two bay five-story structures. Another one set of the beam-column joint was designed as per IS 1893 code provision and detailed based on IS 456 recommendations. Among the beam column joint subassemblages, the first one was manufactured with an ordinary reinforced concrete with the detailed reinforcement as per IS 13920 and the second one was prepared with 1% of steel fibre which has Crimbed and Hooked end, with the ordinary reinforcement as per IS 456.The third specimen was created with 1% fibre reinforcement which had detailed reinforcement as per IS 13920. The model was developed by considering the 1/5thscale of the prototype and was tested under forward cyclic loading. The loading frame was used to produce the cyclic loading to examine the behaviour of the beam-column joints in terms of load carrying capacity, deflection, ductility and energy observation. The study concluded that increased energy absorption capacity and ductility properties of the exterior beam-column joint with the addition of the steel fibres and detailed reinforcement as per IS 13920. Thus, the experimental results indicated that fibre reinforced concrete is an innovative solution to conventional confining reinforcement