M.R. Noori Shirazi - Ph.D Candidate of Sahand University of Technology, Academic Staff of Islamic Azad University of Chaloos, Chaloos, Iran
H. Afshin - Associate Professor of Structural Engineering, Department of Civil Engineering, Sahand University of Technology, Tabriz, Iran
K Abedi - Professor of Structural Engineering, Sahand University of Technology, Tabriz, Iran

This paper presents a new rectified square steel jacket for retrofitting of poorly confined reinforced concrete columns in flecural plastic hinge regions. All of the analyses was carried out based on finite elements procedure. Having verified the FE modeling, a deficient RC column designed according to pre-1971 codes was considered and eight specimen with vaious detail of retrofitting was investigated.

seismic retrofitting , rectified steel jacket, finite element analysis , energy dissipation