BEHAVIOR OF JACKETED COLUMNS

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.