Analysis and Implementation of Thin‐Layer Element for Interfaces and Joints

An analysis and implementation of the thin‐layer element of Desai et al. for interfaces and joints shows that the planar approximation of the element treated as a solid element can provide satisfactory simulation of the finite‐sized interface zone, and in the limit, its results approach those from the zero‐thickness element. Advantages and limitations of the thin‐layer element are identified, and it is implemented in a nonlinear finite element procedure with the hierarchical single surface plasticity model. The computed results are compared with those from laboratory tests on joints in concrete with different asperity angles. The nonassociative version provides highly satisfactory correlation with laboratory observations.