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

Abstract

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