Experimental Investigations on Beam- Column Joint with Fibers under Cyclic Loading

Abstract

— Beam-column joint plays a main role in withstanding the horizontal and vertical shear forces under seismic excitation. The magnitudes of Beam-Column joints will be higher than other structure parts. The detailing work in Beam-Column joints have to be done carefully. If it is not done carefully then the joint will become weak link and the structure leads to fail. To prevent this detailing work should be done by following several codes. For better seismic performance ductile detailing should be done under IS 13920-1993.The beam column joint should be having high percentage of transverse hoop reinforcement in order to meet the required strength, toughness, stiffness, ductility, under cyclic loading. High percentage transverse hoop detailing is hard to execute in site. For relaxation of this difficulty steel fibers are introduced as reinforcement in some volumetric fractions and the hoop detailing can be reduced. The steel fibers will fulfils the required strength. In this project one control Beam- column joint of M-60 grade concrete with hoop reinforcement detailed as per IS  13920 and one control beam without Hoop reinforcement as per ACI-318 has been made. Then four types of Beam-Column joint specimens with volume fraction of steel fibers in 0.25%, 0.5%, 0.75%, 1% has been made. The specimens with steel fibers will not be having hoop reinforcement. The several specimens have been tested under cyclic loading and their performance has been compared.