Compressive strengthening of steel columns with local corrosion using CFRP

Document Type : Research Article

Authors

1 PH.D student

2 Associate Professor, Department of Civil Engineering, Kerman-branch, Islamic Azad University, Kerman, Iran

3 Assistant Professor, Department of Civil Engineering, Zahedan Branch, Islamic Azad University, Zahedan, Iran

4 Department of Civil Engineering, Sirjan Branch, Islamic Azad University, Sirjan, Iran

Abstract

Steel structures are damaged for a variety of reasons including accidental loads, corrosion and reduced strength which need to be repaired and improved. In this investigation, local corrosion was applied to the steel circular columns and the effects of Carbon Fiber Reinforced Polymer (CFRP) for ‎strengthening have been studied. 19 specimens of steel Circular Hollow Section (CHS) column ‎with the same height and damage dimensions under compressive load were analyzed by ABAQUS software which six cases of them were performed experimentally. In laboratory cases, progressive corrosion was used to create damage to the specimens. In order to improve the accuracy of the analysis, a combined ‎method was used to study the post-buckling of the plastic zone. For this purpose, the ‎specimens were first subjected to elastic buckling analysis and then Riks non-linear analysis ‎with global and local imperfections was conducted. The results showed that the corrosion ‎reduces the bearing capacity and rigidity of the steel columns‏ ‏and complete destruction of the corroded area reduced the load bearing capacity by 40% for the column with corrosion in the middle and by 21% for the damage close to the base, which shows the former is more critical. Strengthening of columns retrofitted with carbon fibers restored ultimate load reduction by 33% and had a positive effect on controlling fractures and reducing stresses in the damaged area.

Keywords

Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 54, Issue 5
August 2022
Pages 1835-1856

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