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http://dx.doi.org/10.7781/kjoss.2014.26.3.169

Axial Loading Behaviors of Square Concrete-Filled Tubular Columns with Large Width-to-Thickness Ratio Retrofitted using Carbon Fiber Reinforced Polymer Sheets(CFRP Sheets)  

Park, Jai Woo (Korea Infrastructure Safety Corporation, Research Division)
Yoo, Jung Han (School of Architecture, Seoul National University of Science & Technology)
Publication Information
Journal of Korean Society of Steel Construction / v.26, no.3, 2014 , pp. 169-176 More about this Journal
Abstract
This paper presents the experimental results of behavior of square CFT columns with large the width-ro thickness ratio strengthened with carbon fiber reinforced polymers (CFRP) sheets subjected to concentrated axial loading. The main parameters were b/t ratio and the number of CFRP layers and 6 specimens were fabricated. The values of b/t were ranged from 60 to 100. From the tests, Maximum increase of 16% was also achieved in axial-load capacity with three transverse layered CFRP applied on four sides of steel tubes. The load capacity decreased up to 41% comparing with nominal load capacity of unstrengthened CFT column. However, for CFRP strengthened CFT, the load capacity decreased up to 32%. Finally, from the load-strain relationships, the local buckling occurred before yield point of steel tubes. Also, from the load-strain relationships, it was observed that local buckling were delayed on CFT columns by CFRP sheets retrofitting.
Keywords
Carbon fiber sheet; CFRP; Concrete filled steel tube column; CFT; Retrofit;
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Times Cited By KSCI : 2  (Citation Analysis)
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