To study the size effect of reinforced concrete columns strengthened with carbon fiber reinforced polymer (CFRP) under axial compression loading

three groups of thirty geometrically similar reinforced concrete columns strengthened with CFRP were designed and tested. Test parameters including column size

reinforcement layout

and loading history were studied

and the relationships between the properties of the proposed columns (such as failure mode

ultimate strength

peak stress

and residual deformation) and column size were investigated under axial compression loading. Experimental results show that with the same size

the ultimate strength of the reinforced concrete columns strengthened with CFRP was higher than that of the plain concrete columns. As the size of the concrete columns strengthened with CFRP increased

the peak stress first increased and then decreased. The normalized axial deformability and residual deformation of the concrete columns strengthened with CFRP decreased with the increase in the size of the columns. Different loading histories had little effect on the bearing capacity and ultimate displacement of the concrete columns strengthened with CFRP.