Bond-slip behavior under monotonic uniaxial loads

An analytical model which can simulate the bond-slip behavior between reinf orcing steel and concrete is proposed. Unlike the classical bond-link or bo nd-zone element using double nodes, the proposed model takes into considera tion the bond-slip effect without taking double nodes. After determination of the boundary condition at both ends of a reinforcing steel, the deformat ion of the steel at each node can be found through the back-substitution te chnique from the first to the final steel element using a governing equatio n that was constructed based on the equilibrium at each node of steel and t he compatibility condition between steel and concrete. The numerical model results in an effective use in the case of complex steel arrangements when the steel elements cross the sides of the concrete elements, and second, tu rns the impossibility into a possibility in considering the bond-slip effec t in one- and three-dimensional finite element analyses. In addition, the p roposed model is applied to the banding problem using a beam element. Final ly, the analytical predictions an compared with experimental results of mon otonic loads and very good agreements are obtained. (C) 2000 Published by E lsevier Science Ltd.