EVALUATION OF BENDING BEHAVIOR OF RC COLUMN UNDER THE CYCLIC FORCE BASED ON THE NON-LINEAR FINITE ELEMENT ANALYSIS FOCUSING ON THE BOND-STRAIN-SLIP RELATIONSHIP BETWEEN REBARS AND CONCRETE AT THE COLUMN BASE

Abstract

 The bending behavior of the reinforced concrete column structure is governed by the pull-out behavior of axial reinforcement. In this study, we performed a cyclic loading test of a reinforced concrete column and investigated the step history, distribution of the strain of axial rebars, and the damage of the columns in detail. The remarkably asymmetrical damage distribution has been observed in the axial reinforcement at the base of the RC column. And the buckling induced in the axial reinforcements caused the deterioration of the lateral force capacity at the post-peak. To reproduce the above bending behavior, we performed the structural analysis in detail based on the nonlinear finite element analysis. As a result, we found that the appropriate modeling of the bond-slip-strain phenomena between the reinforcement and the concrete can reproduce the bending behavior of the RC column.

 In this paper, we reported the effect of bond-slip characteristics of axial reinforcing bars on the bending behavior of RC column structures.