A two-scale damage model for high-cycle fatigue at the fiber-reinforced polymer–concrete interface

•Material model of the fiber reinforced polymer–concrete bond under high-cycle fatigue is developed.•Implemented two-scale damage model as a material model for a 3D an eight-node interface element.•Developed a new cycle jump approach.•Comparisons of the results from the (FEM) model with experimental data have been performed.•The sensitivity of the model at maximum cycle load to the different parameters has been determined.

This paper presents a new two-scale damage model of the fiber-reinforced polymer (FRP)–concrete bond under high-cycle fatigue. The material behavior is modeled as elastic-plastic coupled with damage for the microscale analysis and as elastic for the mesoscale analysis. A new damage law for the interface joint is described. The two-scale damage model has been implemented as a material model for a three dimensional an eight-node interface element of zero thickness and used to simulate a double shear joint specimen under high cycle fatigue. The numerical calculations were performed with a full incremental cycle solution and a new cycle jump approach.