Abstract
This paper presents the experimental and analytical results of eccentrically loaded short cold-formed thin-wall steel channels strengthened with transversely oriented carbon fiber reinforced polymer (CFRP) strips around their web and flange. Seven specimens, each 750 mm long, were fabricated; the main parameters were the number of CFRP plies (one or two) and the space between the CFRP strips (50, 100, or 150 mm). The application of the CFRP strips results in increases in ultimate load capacity and, with the exception of the most heavily reinforced (2 plies at 50 and 100 mm), local buckling was observed prior to global buckling. To extend and better understand the experimental work, a companion analytical study was conducted. Comparisons between experimental observations and computed results show that the analyses provided good correlation to actual behavior. In addition, the numerical results explained the observed phenomenon that flange local buckling was constrained to regions between the CFRP strips.
Highlights
Recent work has highlighted improving the stability-related capacity of carbon fiber reinforced polymer (CFRP) reinforced axially loaded steel structures [1, 2]
The six specimens reinforced with CFRP exhibited both flange local buckling (FLB) and flexural torsional buckling (FTB) as described
It was indicated that the CFRP may play a significant role in resisting the flange local buckling like the “brace” if externally bonded CFRP strips space is appropriate
Summary
Recent work has highlighted improving the stability-related capacity of carbon fiber reinforced polymer (CFRP) reinforced axially loaded steel structures [1, 2]. In this application, the high stiffness and linear material behavior of the FRP materials used are utilized to provide “bracing” that improves the buckling and postbuckling behavior of steel components [1]. Because of thin-walled cross-section having a relatively large width-thickness ratio, local buckling occurs before reaching the yield strength. This paper, is focused on evaluating the effectiveness of reinforcing thin-walled short steel channels subject to eccentric compression loads with CFRP; buckling behaviors and the associated failure modes are described. The influence of the CFRP thickness and interval of transverse CFRP strips is investigated
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