DOI QR코드

DOI QR Code

Behaviors of concrete filled square steel tubes confined by carbon fiber sheets (CFS) under compression and cyclic loads

  • Park, Jai Woo (University of Seoul, Department of Architecture Engineering) ;
  • Hong, Young Kyun (Hongik University, Department of Architecture) ;
  • Choi, Sung Mo (University of Seoul, Department of Architecture Engineering)
  • 투고 : 2009.09.03
  • 심사 : 2010.03.18
  • 발행 : 2010.03.25

초록

The existing CFT columns present the deterioration in confining effect after the yield of steel tube, local buckling and the deterioration in load capacity. If lateral load such as earthquake load is applied to CFT columns, strong shearing force and moment are generated at the lower part of the columns and local buckling appears at the column. In this study, axial compression test and beam-column test were conducted for existing CFT square column specimens and those reinforced with carbon fiber sheets (CFS). The variables for axial compression test were width-thickness ratio and the number of CFS layers and those for beamcolumn test were concrete strength and the number of CFS layers. The results of the compression test showed that local buckling was delayed and maximum load capacity improved slightly as the number of layers increased. The specimens' ductility capacity improved due to the additional confinement by carbon fiber sheets which delayed local buckling. In the beam-column test, maximum load capacity improved slightly as the number of CFS layers increased. However, ductility capacity improved greatly as the increased number of CFS layers delayed the local buckling at the lower part of the columns. It was observed that the CFT structure reinforced with carbon fiber sheets controlled the local buckling at columns and thus improved seismic performance. Consequently, it was deduced that the confinement of CFT columns by carbon fiber sheets suggested in this study would be widely used for reinforcing CFT columns.

키워드

과제정보

연구 과제번호 : Development of highly-efficient production & disaster-prevention technology for skyscrapers

연구 과제 주관 기관 : KOSEF, Korea Research Foundation

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피인용 문헌

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