Journal of Korean Society of Steel Construction (한국강구조학회 논문집)

Korean Society of Steel Construction (한국강구조학회)
권호 표지
DOI QR코드

DOI QR Code

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
Download PDF
⟨ Previous Next ⟩

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

  1. Xiao, X.L. and Zhang, L. (2006) State-of-the art Review on FRP Strengthened Steel Structures, Engineering Structures, Vol. 29, pp 1808-1823.
  2. Miller, T.C., Chajes, M.J., Mertz, D.R., and Hastings, J.N. (2001) Strengthening of a Steel Bridge Girder Using CFRP Plates, J. Bridge. Eng., ASCE, Vol. 6, No. 6, pp.514-522. https://doi.org/10.1061/(ASCE)1084-0702(2001)6:6(514)
  3. Narmashiri, K., Jumaat, M.Z., and Ramli Sulong, N.H. (2010) Shear Strengthening of Steel I-Beams by using CFRP strips, Scientific Research and Essays, Vol. 5, No. 16, pp.2155 -2168.
  4. 박재우, 홍영균, 홍기섭, 이성희, 최성모(2009) 탄소섬유 쉬트로 구속된 콘크리트충전 각형강관기둥의 단조압축실험, 한국강구조학회논문집, 한국강구조학회, 제21권, 제3호, pp.311-320. Park, J.W., Hong, Y.K., Hong, G.S., Lee, S.H., and Choi, S.M. (2009) The Experimental Study on Axial Loaded Concrete Filled Steel Tube Confined by Carbon Fiber Sheet, Journal of Korean Society of Steel Construction, KSSC, Vol. 21, No. 3, pp.223-320 (in Korean).
  5. Teng, J.G. (2007) Behavior of FRP-jacketed circular steel tubes and cylindrical shells under axial compression, Construction and Building Materials, Vol. 21, pp.827-838. https://doi.org/10.1016/j.conbuildmat.2006.06.016
  6. Shatt, A. and Fam, A. (2006) Axial Loading Tests on Short and Long Hollow Structural Steel Columns Retrofitted using Carbon Fibre Rein-forced Polymers, Canadian Journal of Civil Eng, Vol. 6, No. 6, pp.458-470
  7. 대한건축학회(2009) 건축구조설계기준및해설(KBC 2009), 기문당. AIK (2009) Korea building code and commentary - structural, Architectural Institute of Korea (in Korean).
  8. AISC (2010) Specification for Structural Steel Buildings, American Institute of Steel Construction, USA.
  9. Teng, J.G., Chen, J.F., Smith, S.T., and Lam, L. (2002) FRP Strengthened RC Structures, Jonh Wiley & Son, INC., pp.3-5.
  10. Hu, Y.M. (2011) Behavior and Modeling of FRP Confined Hollow and Concrete-Filled Steel Tubular Columns, Ph.D. Thesis, Hong Kong Polytechnic Univ., p.35.
  11. 정원제(2012) 폭두께비가 큰 각형 CFT단주의 구조성능 평가, 서울시립대학교 석사학위논문, pp.63-64. Jung, W.J. (2012) Evaluation of Structural Performance of Square CFT Columns with Slender Elements, Master thesis, University of Seoul., pp.63-64 (in Korean).

Cited by

  1. Experimental Study of Flexural Behavior of Steel Beam Strengthened with the Fiber Reinforced Polymer Plastic(FRP) Strips vol.26, pp.2, 2014, https://doi.org/10.7781/kjoss.2014.26.2.069
  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