There are many methods of column seismic reinforcement, carbon fiber is one of the most used new reinforcement materials in recent years. It is very effective for reinforced concrete bending, axial compression, large eccentric compression and tensile member reinforcement. 

When applying carbon fiber to the column for seismic reinforcement, the following points should be met:

When the bearing capacity of the positive section of the column axis under compression is insufficient, the circumferential encircling beam method can be used for alignment and reinforcement. That is to continuously paste carbon fiber cloth along the entire length of the column without gaps to reinforce it.

When the shear capacity of the diagonal section of the column is insufficient, the carbon fiber cloth can be pasted into a ring-shaped hoop, and the fiber direction is perpendicular to the longitudinal axis of the column. When reinforcing reinforced concrete columns with large eccentric compression, carbon fiber cloth should be pasted to the concrete surface at the edge of the tension zone of the member, and the fiber direction should be consistent with the longitudinal axis of the column.

When the columns with insufficient ductility are subjected to seismic reinforcement, the hoop encircled by carbon fiber cloth can be used as an additional stirrup. The number of layers of carbon fiber cloth in the circumferential direction should not be less than 2 layers for circular cross-sections and 3 layers for square and rectangular cross-section columns. The overlap width between the upper and lower layers of the hoop should not be less than 50mm, the extension length of the hoop truncation point should not be less than 200mm, and the overlap positions of the strips should be staggered from each other.