Simulation of the Nonlinear Behavior of Strengthened RC Columns Under Pure Axial Compressive Load Using the CDPM Model

This study aims to apply the Coupled Damage-Plasticity Microplane (CDPM) model to simulate the nonlinear behavior of reinforced concrete (RC) columns strengthened by a steel jacket, including the steel angles and the prestressed steel straps. A three-dimensional finite element model of a strengthened RC column subjected to a static pure axial compressive load is simulated in the ANSYS Workbench software. The CPT215 solid elements with eight nodes that are improved by the CDPM material model are used to simulate the nonlinear behavior of the concrete part, while the REINF264 embedded elements are used to simulate the reinforcement behavior of longitudinal rebars. The most appropriate parameters of the CDPM model for the strengthened RC columns are proposed. The finite element model is validated by the experimental results of previous studies and is then utilized to investigate the influence of the strengthening system on the bearing capacity of the RC columns.