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Steel and Composite Structures Volume 15, Number 2, August 2013 , pages 131-150 DOI: https://doi.org/10.12989/scs.2013.15.2.131 |
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Axial loading tests and load capacity prediction of slender SHS stub columns strengthened with carbon fiber reinforced polymers |
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Jai-woo Park and Jung-han Yoo
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| Abstract | ||
| This paper presents the experimental results of axially loaded stub columns of slender steel hollow square section (SHS) strengthened with carbon fiber reinforced polymers (CFRP) sheets. 9 specimens were fabricated and the main parameters were: width-thickness ratio (b /t), the number of CFRP ply, and the CFRP sheet orientation. From the tests, it was observed that two sides would typically buckle outward and the other two sides would buckle inward. A maximum increase of 33% was achieved in axial-load capacity when 3 layers of CFRP were used to wrap HSS columns of b /t = 100 transversely. Also, stiffness and ductility index (DI) were compared between un-retrofitted specimens and retrofitted specimens. Finally, it was shown that the application of CFRP to slender sections delays local buckling and subsequently results in significant increases in elastic buckling stress. In the last section, a prediction formula of the ultimate strength developed using the experimental results is presented. | ||
| Key Words | ||
| FRP; CFRP; Steel hollow section (SHS); slender section; retrofit; elastic buckling; reduction factor | ||
| Address | ||
| (1) Jai-woo Park: Gayoon Construction. Co. Ltd., 9-91, Hwayang-dong, Gwangjin-gu, Seoul, 143-130, Republic of Korea (2) Jung-han Yoo: School of Architecture, Seoul National University of Science & Technology, 232 Gongreung-ro, Nowon-gu, Seoul, 139-743, Republic of Korea. | ||