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Concentrated Axial Loading Test for Slender Square Hollow Section Retrofitted by Carbon Fiber Reinforced Polymer Sheets(CFRP Sheets)

탄소섬유쉬트(CFRP Sheets)로 보강된 세장한 각형강관기둥의 중심축하중실험

  • Park, Jai Woo (Dept. of Construction, Gayoon Construction, Co., Ltd.) ;
  • Choi, Sun Kyu (Sunyoung Architects & Engineering Consultants) ;
  • Choi, Sung Mo (Dept. of Architectural Engineering, University of Seoul) ;
  • Song, Dong Yub (Dept. of Architecture, Korea Infrastructure Safety Corporation) ;
  • Yoo, Jung Han (School of Architecture, Seoul National University of Science & Technology)
  • 박재우 ((주) 가윤, 건축부) ;
  • 최선규 (선영구조기술사건축사사무소) ;
  • 최성모 (서울시립대학교, 건축학부) ;
  • 송동엽 (한국시설안전공단, 건축팀) ;
  • 유정한 (서울과학기술대학교 건축학부)
  • Received : 2012.10.22
  • Accepted : 2012.11.29
  • Published : 2012.12.27

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. 6 specimens were fabricated and the main parameters were: width-thickness ratio(b/t) and CFRP retrofitting. 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. Also, stiffness and ductility index(DI) were compared between unretrofitted specimens and retrofitted specimens. In the last section, a prediction formula of the ultimate strength developed using the experimental results is presented.

본 연구에서는 세장판으로 구성된 중공강관(SHS)기둥에 CFRP쉬트로 보강하여 중심축하중 실험을 수행하였다. 총 6개의 실험체를 제작하였으며, 실험변수는 판폭두께비, 보강유무이다. 실험결과 사각단면의 두면은 안쪽으로 국부좌굴이 발생하였으며, 나머지 두 면은 바깥쪽으로 국부좌굴이 발생하였다. CFRP쉬트의 보강을 통해 최대 33%의 내력상승효과를 얻었으며, 초기강성과 연성능력을 비교하였다. 끝으로, 압축극한 내력을 산정식을 제안하여 실험값과 비교하였다.

Keywords

References

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  2. Axial Loading Behaviors of Square Concrete-Filled Tubular Columns with Large Width-to-Thickness Ratio Retrofitted using Carbon Fiber Reinforced Polymer Sheets(CFRP Sheets) vol.26, pp.3, 2014, https://doi.org/10.7781/kjoss.2014.26.3.169
  3. Behaviors of Long Square Hollow Section Columns Retrofitted using Carbon Fiber Reinforced Polymer Sheets(CFRP Sheets) Subjected to Concentrated Axial Loading vol.25, pp.3, 2013, https://doi.org/10.7781/kjoss.2013.25.3.299
  4. 탄소섬유쉬트(CFRP Sheets)로 보강된 각형강관(HSS)기둥의 유한요소해석 연구 vol.28, pp.3, 2012, https://doi.org/10.7781/kjoss.2016.28.3.185