Modeling of interfaces in two-dimensional problems using solid finite elements with high aspect ratio

► Modeling thin interface with solid finite elements with very high aspect ratio. ► A scalar damage model can be used to describe bond degradation due to slip. ► The technique can model the bond-slip behavior of rebars embedded in concrete. ► Densification of the finite elements in the interface region is not required. ► Discrete constitutive relations and contact elements are not necessary. The use of standard solid finite elements with a very high aspect ratio is proposed to model the behavior of thin interface regions between distinct components of composite structural members. It is shown that these elements present the same kinematics as the Continuous Strong Discontinuity Approach (CSDA) and can be used to describe bond stresses between components, even when the thickness of the interface region tends to zero. A scalar damage model consistent with the CSDA is presented to describe bond degradation due to slip. The technique is successfully applied to model the bond-slip behavior of reinforcing bars embedded in concrete.