Two series of tests were made to study the behavior of jacketed columns. The first consisted of uniaxially loaded specimens and the behavior of jacketed columns was compared with a monolithic reference specimen. It was found that specimens with repair and strengthening jackets behaved well when jacketing was introduced after unloading. Repair jacketing made under load exhibited poor behavior. In the second series, jacketed columns were tested under combined axial load and bending (monotonic and reversed cyclic). The effectiveness of repair and strengthening jackets was studied considering strength, stiffness, and energy dissipation. It was found that repair and strengthening jackets behaved well both under monotonic and reversed cyclic loadings.