Abstract
This paper presents the results of an experimental investigation into the behavior of slender steel columns strengthened using high-modulus (313 GPa) , carbon fiber-reinforced polymer (CFRP) plates. Eighteen slender hollow structural section square column specimens, 44×44×3.2 mm , were concentrically loaded to failure. The effectiveness of CFRP was evaluated for different slenderness ratios (kL∕r) , namely, 46, 70, and 93. The maximum increases in ultimate load ranged from 6 to 71% and axial stiffness ranged from 10 to 17%, respectively, depending on kL∕r . As kL∕r reduced, the effectiveness of CFRP plates also reduced, and failure mode changed from CFRP plate crushing after occurrence of overall buckling, to debonding prior to, or just at, buckling. A simplified analytical model is proposed to predict the ultimate axial load of FRP-strengthened slender steel columns, based on the ANSI/AISC 360-05 provisions, which were modified to account for the transformed section properties and a failure criteria of F...
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