A theoretical axial stress–strain model for gangue ceramsite concrete confined with FRP tube

A total of 48 cylinders prepared using gangue ceramsite concrete (GAC) confined with fiber reinforced polymer (FRP) were tested under axial compression, and the effects of concrete type, concrete strength and FRP confinement level were analyzed. The results show that the porosity and low strength of aggregate lead to brittle failure of concrete, whereas both the strength and ductility of GAC have been significantly enhanced with the confinement provided by an external FRP tube. By using the microscopic analysis to reasonably consider the effect of aggregate characteristics on FRP-confined concrete, the proposed model can more accurately predict the stress–strain behavior of FRP-confined GAC.