Improved concrete plastic-damage model for FRP-confined concrete based on true tri-axial experiment

The constitutive relationship of concrete under passive confinement of fibre reinforced polymer (FRP) is one of the fundamental requirements for mechanical analysis of FRP-confined concrete members. The existing tri-axial constitutive models are commonly established based on actively confined concrete or uniform passively confined concrete. True tri-axial experiments and corresponding constitutive models for non-uniform passively confined...