Salam
if we have to increase the area of an existing column of size 24x24 reinforced with 22#8 bars to 36x36, columns has been erected on a 24" raft with 11ft height constructed, columns will be erected two more 11' heights. seismic zone 3.
if steel jacketing applied how can the jacketing sizes, thickness and strength can be calculated.
any other techniques can be applied?
any literature relevant to this problem, code references, books, articles or case studies
Regards