Confinement path-dependent analytical model for FRP-confined concrete and concrete-filled steel tube subjected to axial compression

In composite component, confined concrete is widely used in civil engineering due to its excellent performance, such as high compressive strength and good plasticity. In this study, an actively-confined concrete model is developed using current published models and test data, the stress-strain behavior of concrete in active confinement and fiber-reinforced polymer confinement are compared, then the influence of loading path on concrete is quantified. An analytical model is developed to predict the mechanical behavior of confined concrete columns, and validated using previously published test results. The analytical model is found to provide satisfactory predictions in short concrete columns confined by FRP or steel tubes.