1 Assistant Professor, Department of Civil Engineering, College of Engineering, Thiruvananthapuram, Kerala, India
2 P. G. Student, Dept. of Civil Engineering, College of Engineering, Thiruvananthapuram, Kerala, India
*Email: kj_sreekumar@yahoo.co.in
Online published on 7 February, 2013.
The performance of beam-column joints have long been recognized as a significant factor that affects the overall behaviour of reinforced concrete (RC) framed structures subjected to large lateral loads. The reversal of forces in beam-column joints during earthquakes may cause distress and often failure, when not designed and detailed properly. In the present study, four one third scaled exterior beam-column joint specimens were prepared with only one of them conforming to the guide lines of IS 13920: 1993 for seismic resistant design. Second one was detailed with additional diagonal collar stirrups at joints and beam reinforcements and the third one is cast without collar stirrups but having additional beam reinforcements. The fourth specimen was having same longitudinal reinforcements of the first specimen but with increased spacing of ties in the joint region. All the specimens were subjected to similar reverse cyclic loading to simulate earthquake loading in structures. The loading was applied by displacement control mode. Based on the experimental findings and subsequent analysis, it is found that, second specimen having additional beam reinforcements and diagonal collar stirrups at joints exhibits a better performance than the others.
Beam-column joint, ductility, energy dissipation, reinforcement details, ultimate load
