Two series of tests were made to study the behavior of jacketed column
s. The first series consisted of uniaxially loaded specimens, and the
behavior of jacketed columns was compared with a monolithic reference
specimen. The main objective of this series was to study the effective
ness of repair and strengthening jackets and the differences between j
ackets made under load and after unloading. Specimens with repair and
strengthening jackets behaved well when jacketing was introduced after
unloading. Repair jacketing made wider load exhibited poor behavior I
n the second series, jacketed columns were tested under combined axial
load and bending (monotonic and reversed cyclic). Two monolithic spec
imens also were tested to serve as reference specimens. Effectiveness
of repair and strengthening jackets was studied considering strength,
stiffness, and energy dissipation. The influence of load history (mono
tonic and reversed cyclic) on the behavior of jacketed columns also wa
s studied. Repair and strengthening jackets behaved well both under mo
notonic and reversed cyclic loadings.