In this study, the effect of joint shear reinforcement on the ultimate behaviour of two-dimensional reinforced concrete (RC) interior beam-column joints subjected to a lateral load was examined under various conditions. Eight half-scale RC interior beam-column joint connections were tested under cyclic lateral loading. All specimens have the same dimensions and member sizes but different reinforcing detailing. Based on parametric studies adopting so-called “quadruple flexural resistance theory”, four major parameters of the test program are identified. They are (1) column-to-beam flexural strength ratio (2) joint shear reinforcement ratio (3) joint shear demand ratio and (4) column depth-to-beam bar diameter ratio. The main objective of our work is to widen current knowledge of the effect of joint shear reinforcement on strength as well as deformation of RC interior joints. Test results indicated that the effect of joint hoops is affected by a bond condition of beam rebars and flexural strength ratio of members framing into the joint. A lesser amount of hoop reinforcement with a wider spacing could be used without significantly affecting the performance of joints when the strength ratio is much greater than unity, and the bond condition is medium. Further, joint shear stress is not a good index to evaluate beam-column joints with larger flexural strength ratio.
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