Joints between beams and columns can be considered the weakest sections in multi-storey reinforced concrete (RC) frame structures subjected to earthquake loads, as these joints significantly influence load moment transmission. To examine earthquake-resistant performance, four joint samples consisting of RC material were created to simulate cyclic lateral loading under controlled laboratory conditions. In the investigated study, two joint specimens were designed according to IS: 456-2000 specifications, symbolizing non-ductile design, while another two were designed according to IS: 13920-1993 specifications for ductile design. Additionally, the two ductile joint specimens were designed to simulate the effect of 10% and 20%, specifically referring to their axial load capacity, column loads. All joint specimens were designed using C30-concrete strength grade. In the testing procedure, constant column loads were applied to the columns, but the beams were loaded using a hydraulic actuator under displacement-controlled loading conditions. Increasing displacement was applied under a constant load rising to a maximal value. Hysteresis loop data were collected to examine performance under seismic loads. The key performance parameters, such as load carrying capacity, stiffness deterioration, energy dissipation, and ductility, were investigated in detail. The ductile joints performed better under cyclic loading and exhibited better strength characteristics, higher energy dissipation capacity, and post-yield behaviour. In addition to this, the effect of axial load on the columns also assisted in improving the bounding effect that helps to resist the deterioration of joints. The results highlight the significance of ductile detailing to improve the seismic resistance of RC framed structures. The need for earthquake-resistant design parameters has been emphasized to avoid any catastrophic damage to structures during earthquake occurrences.
Ravichandran K.2 Balamuralikrishnan R.1* (Sun,) studied this question.