Title: Behavior of Jacketed Columns

Author(s): Ugur Ersoy, A. Tugrul Tankut, and Ramadan Suleiman

Publication: Structural Journal

Volume: 90

Issue: 3

Appears on pages(s): 288-293

Keywords: axial loads; bending; columns (supports); cyclic loads; earthquake-resistant structures; energy methods; loads (forces); reinforced concrete; repairs; stiffness; structural design; tests; Design

DOI: 10.14359/4236

Date: 5/1/1993

Abstract:
Two series of tests were made to study the behavior of jacketed columns. 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 effectiveness of repair and strengthening jackets and the differences between jackets made under load and after unloading. Specimens with repair and straightening 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). Two monolithic specimens were also tested to serve as reference specimens. Effectiveness of repair and straightening jackets was studied, considering strength, stiffness, and energy dissipation. The influence of load history (monotonic and reversed cyclic) on the behavior of jacketed columns was also studied. Repair and strengthening jackets behaved well under both monotonic and reversed cyclic loads.