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Composites: Mechanics, Computations, Applications: An International Journal

ISSN Print: 2152-2057
ISSN Online: 2152-2073

Composites: Mechanics, Computations, Applications: An International Journal

DOI: 10.1615/CompMechComputApplIntJ.v7.i4.20
pages 275-290

ANALYSIS AND STRENGTHENING OF SHS STEEL COLUMNS USING CFRP COMPOSITE MATERIALS

Amir Hamzeh Keykha
Department of Civil Engineering, Zahedan Branch, Islamic Azad University, Zahedan, Iran
Masoud Nekooei
Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Reza Rahgozar
Department of Civil Engineering, Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran

ABSTRACT

Steel structures often need strengthening due to increased life loads, or repair due to corrosion or fatigue cracking. Multiple studies have been performed concerning the structural steel beams, while few have been conducted on columns. The stability of columns is very important in steel structures. It is one of the main factors in buckling instability, resulting in large deformations and failure. No independent article, to the author's knowledge, has studied the effect of carbon fiber- reinforced polymers (CFRP) strengthening on slender square hollow section (SHS) steel columns with different boundary conditions. However, this study explored the use of flexible adhesively bonded CFRP sheets in retrofitting slender SHS steel columns by numerical and analytical investigations. The finite element method (FEM) was used for modeling. ANSYS was employed for the analysis of samples. To determine the critical load of SHS steel columns, 15 samples, strengthened with CFRP, were analyzed under different support conditions. The results showed that the support condition and the CFRP coverage are effective in the critical load of columns.