SEISMIC BEHAVIOR OF EXTERIOR BEAM-COLUMN JOINT USING MECHANICAL ANCHORAGE UNDER REVERSAL LOADING: AN EXPERIMENTAL STUDY

In reinforced concrete structures, beam-column joints are one of the most critical
regions in the areas with moderate and severe seismic prone areas. Proper reinforcement
anchorage is essential to enhance the performance of beam-column joints. Congestion of
reinforcement and construction difficulty is one of the critical problems while using conventional
reinforcement detailing in beam-column joints of concrete structures. An effort has been made to
study and evaluate the performance of beam-column joints. The joints are detailed for higher
seismic prone areas as per ACI-352 (Mechanical Anchorage), ACI-318 (Conventional Hooks
Bent) and IS-456 (Full Anchorage Hooks Bent) along with confinement as per IS-13920 and
proposed X-cross plus hair clip bar joint reinforcement. Apart from finding the solution to these
problems, significant improvements in seismic performance, ductility and strength were observed
while using mechanical anchorage in combination with X-cross plus hair clip bars. To assess the
performances of anchorages and joint details, the specimens were assembled into two groups of
three specimens each. The specimens were tested under reversal loading and test results were
evaluated and presented in this paper.