New special finite elements for modeling reinforcement and steel-concrete interface

In this paper, Isoparametric finite element formulations are derived for sp ecial elements for representing the steel-concrete interface. Curved multi- noded Isoparametric element for reinforcing steel idealization is proposed. In addition, special thin Isoparametric element in a form of a sheath is s uggested in order to model the bond-slip characteristics. Special provision s are taken into account to avoid numerical difficulties. The proposed elem ents are incorporated in non-linear finite element program DMGPLSTS and app lied to the problem of tension stiffening of reinforced concrete members. T he results are noted to reflect a softer overall response attributable to t he slip effect.