Abstract: Experimental study of 10 PVC-FRP confined reinforced concrete column subjected to axial compression were carried out. The experimental results show that the stress-strain curves can be divided into two stages: the first section of the stress-strain relationship curves is parabola, which is similar to that of reinforced concrete column with the same reinforcement ratio; the second section of the stress-strain relationship curves take on the strengthening stage, and the stress, strain and the strengthening slope gradually reduce with the increment of the hoop spacing of FRP strips. Due to the axial reinforcement, the bearing capacity and deformation of core concrete are greatly improved. The reinforcement ratio almost have no effect on the strengthening slope. According to the regression of experimental results, the calculation formula of bearing capacity and ultimate compressive strain are put forward, and then the related stress-strain model is also established.

Key words: PVC-FRP tube, concrete column, bearing capacity, axial strain, stress-strain relationship