Behaviour of RC exterior beam column joint with alternative ductile detailing under reverse cyclic loading

Abstract

The beam-column joints are widely recognized as the most critical newlineand susceptible element of a reinforced concrete moment-resisting structure newlinewhen subjected to seismic loads. The performance of beam-column joints has newlinereceived attention due to the failure of reinforced concrete structures during newlinesignificant earthquakes. The beam-column joints of a reinforced concrete newlinestructure are crucial as they facilitate the transfer of lateral forces between the newlinebeams and columns. Proper reinforcement anchoring is necessary to enhance newlinejoint performance. Construction challenges and reinforcement congestion are newlinecommonly encountered when applying conventional reinforcement detail in newlinethe joint core area of reinforced concrete structures. Extensive study is newlinenecessary for the design and details of structural members as well as newlinethe connections to construct earthquake-resistant buildings using mechanical newlineanchorage and steel fibres. newlineThe current research work investigated the performance of beam newlineand column connections under lateral cyclic loads, considering various newlinedetailed patterns and the inclusion of steel fibres. Both numerical and newlineexperimental methods were utilized in this study. For this study, one-third of newlinethe scaled models were constructed. For this investigation, a reference newlineconventional specimen and four different types of non-conventional newlinespecimens were considered. (i) A reference to conventional reinforcement newlinedetailing as per IS 13920, (ii) Non-conventional reinforcement detailing using newlineStraight headed bar connection, (iii) Non-conventional reinforcement newlinedetailing using X cross-headed bar connection, in Type I connection (iv) newlineUsing steel fibres in the beam-column joint core region as per IS 456 and SP newline34 detailing (ordinary moment resisting frame, OMRF) and (v) incorporating newlineiv newlinesteel fibres in the joint core region and detailing as per IS 13920 in Type II newlineconnection. newline