Modelling of shear deformation and bond slip in reinforced concrete joints

A macro-element model is developed to account for shear deformation and bon d slip of reinforcement bars in the beam-column joint region of reinforced concrete structures. The joint region is idealized by two springs in series , one representing shear deformation and the other representing bond slip. The softened truss model theory is adopted to establish the shear force-she ar deformation relationship and to determine the shear capacity of the join t. A detailed model for the bond slip of the reinforcing bars at the beam-c olumn interface is presented. The proposed macro-element model of the joint is validated using available experimental data on beam-column connections representing exterior joints in ductile and nonductile frames.