Should concrete columns be strengthened by increasing the cross-sectional area or adding columns beside them?

Methods of increasing cross section: new and old concrete cannot be combined; The ends of the outer steel bars are not anchored properly.

The method of adding a column next to it: affecting the use; Impact outlook; There is no beam at the top of the column, so it is not good to share the transfer load.

Suggestion: Clean and dry the cylindrical surface to the top of the foundation. Spiral wound carbon fiber cloth with structural adhesive ring, with two layers of 0. 133 or 0. 15 thickness, and the surface is pasted or pasted with decorative wall covering.

Advantages: the bearing capacity can be greatly improved; Does not occupy the use space; Beautiful; It can be used immediately without waiting for curing time.