Carbon fiber reinforced polymer (CFRP) fabric has been widely used in the field of structural reinforcement because of its excellent physical and mechanical properties, good adhesion, and easy cutting.

Carbon fiber reinforced polymer (CFRP) fabric has been widely used in the field of structural reinforcement because of its excellent physical and mechanical properties, good adhesion, and easy cutting. CFRP fabric confined concrete is a passive constraint. With the increase of axial pressure of concrete, transverse expansion promotes the circumferential elongation of composite materials, produces lateral restraint force, restrains the transverse expansion deformation of concrete inside the composite materials, thereby improving the axial compressive capacity. The increase of bearing capacity mainly depends on the shape of column section, the strength, quantity and wrapping form of CFRP fabric.

In the actual reinforcement, CFRP fabric confined concrete mainly has two kinds of pasting methods: transverse band spacing wrapping and full wrapping. The intensity of CFRP fabric used mainly includes two types: high strength and high strength two.

1) The ultimate failure of RC columns restrained by CFRP fabric is caused by the sudden failure of CFRP fabric. This failure process has no obvious precursor and is fast, and has obvious brittle failure characteristics. Therefore, in the reinforcement design process, the ductility reserve of the reinforcement column should be fully considered.

2) The ultimate bearing capacity of reinforced concrete columns with full or spaced CFRP fabric has been improved by 55.6%. However, with the increase of concrete strength, the effect of CFRP cloth restraint will be reduced, and the influence of CFRP fabric strength on the strengthening effect will be gradually reduced. With the increase of CFRP girth volume ratio, the ultimate bearing capacity of the strengthened columns has been improved correspondingly, but the rate of strength increase in the later period is slower than that in the earlier period.

3) When the concrete strength is low and the volume reinforcement ratio of CFRP fabric is small, the effect of using high strength carbon fiber fabric is better.

4) For axially compressed RC columns, under the same volume reinforcement ratio of carbon fiber fabric, the reinforcement effect of full-enclosed CFRP fabric is better than that of interval-enclosed CFRP fabric.

5) The CFRP distribution strain is less than the ultimate tensile strain, and the effective strain increases with the increase of the number of reinforcement layers. The strength of CFRP distribution does not play a full role.