Journal of Korean Society of Steel Construction (한국강구조학회 논문집)

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

DOI QR Code

The Compressive Strength of Thin-Walled Cold-Formed Steel Studs with Slits in the Web

복부에 슬릿이 있는 박판냉간성형형강 스터드의 압축강도

  • 권영봉 (영남대학교 건설시스템공학과) ;
  • 서응규 (영남대학교 건설시스템공학과) ;
  • 임덕만 (영남대학교 건설시스템공학과) ;
  • 김갑득 (포항산업과학연구원, 강구조연구소) ;
  • 권인규 (강원대학교 소방방재학부)
  • Received : 2011.08.08
  • Accepted : 2012.03.30
  • Published : 2012.04.27
Download PDF
⟨ Previous Next ⟩

Abstract

The cold-formed steel stud, which has been used as a load-bearing member of wall panels for steel houses, poses a significant problem in insulation due to heat bridging of the web. Therefore, some additional thermal insulating materials are required. In order to solve this problem, the cold-formed steel thermal stud with slits in the web was developed. However, estimating the structural strength of thermal studs is very difficult because of the arrangement of perforations. In this paper, an analytical and experimental research on thermal studs is described. Three types of studs with different length, pitch and arrangement of slits were tested to failure. A simple design approach was proposed based on the test results. The proposed method adopted the direct strength method, based on the elastic local and distortional buckling stress of plain studs with equivalent thickness in the web instead of thermal studs. The predictions using the proposed method were compared with test results for verification and the adequacy of the proposed method was confirmed.

벽식 스틸하우스 벽체의 구조재로 적용되어 오고 있는 박판냉간성형형강 스터드의 경우 열교현상에 의한 단열상의 문제를 가지고 있기 때문에 추가적인 단열재의 사용이 요구된다. 이러한 단열 문제를 해결하기 위하여 웨브에 슬릿이 배치된 냉간성형강 단열스터드가 개발되었다. 그러나 슬릿의 배치로 인하여 단면강도 산정은 대단히 어려운 문제점이 되고 있다. 본 논문에는 단열스터드의 압축강도 및 구조적인 거동에 대한 실험 및 해석적인 연구결과를 기술하였다. 슬릿의 길이, 간격 및 배열형태를 달리하는 세 종류의 단열스터드에 대한 압축실험을 단면의 파괴 시까지 수행하였으며, 실험 및 해석결과에 근거하여 복부에 슬릿이 있는 냉간성형강 스터드에 적용하기 위한 단순한 형태의 강도 산정방법을 제안하였다. 제안된 강도산정법에서는 단열스터드를 등가두께의 슬릿이 없는 일반스터드로 대치하고, 이 등가단면에 직접강도법을 적용하여 단열스터드의 공칭압축강도를 산출한다. 제안된 강도산정방법은 단열스터드 실험결과와 비교하여 검증하였다.

Keywords

References

  1. 권영봉(2000) BAP (ver. 2.0), 영남대학교 건설시스템공학과 부설 방재연구소.
  2. 박명균, 김한식, 권영봉(2002) 신형상 냉간성형 단면의 구조적 거동(I)-압축거동, 한국강구조학회논문집, 한국강구조학회, 제4권, 제2호, pp.349-356.
  3. 이상섭, 배규웅(2004) 복합스터드의 압축 좌굴 거동, 한국강구조학회논문집, 한국강구조학회, 제16권, 제5호, pp.609-619.
  4. AISI (2004) North American Specifications for Design of Cold-Formed Steel Structural Members, American Iron and Steel Institute, Washington DC, USA.
  5. AISI (2004) Supplement 2004 to the North American Specifications for Design of Cold-Formed Steel Structural Members, American Iron and Steel Institute, Washington DC, USA.
  6. Davis J.M., Leach, P., and Taylor, A. (1997) The Design of Perforated Cold-Formed Steel Sections Subjected to Axial Load and Bending, Thin-Walled Structures, Vol. 29(1-4), pp.41-57.
  7. FEA Co., Ltd. (2010) Lusas Element Reference Manual & User's Manual (version 14.3-1).
  8. Hancock, G.J., Murray T.M., and Ellifritt D.S. (2004) Cold-Formed Steel Structures to the AISI Specification, Marcel Dekker, Inc., New York.
  9. Hogland, T. and Burstrand, H. (1998) Slotted Steel Studs to Reduce Thermal Bridges in Insulated Walls, Thin-Walled Structures, Vol. 32, No. 1-3, pp.81-109. https://doi.org/10.1016/S0263-8231(98)00028-7
  10. Kesti, J. (2000) Local and distortional buckling of perforated steel wall studs, PhD Thesis, Helsinki University of Technology, Finland.
  11. Kwon, Y.B. and Hancock, G.J. (1993) Post-Buckling Behaviour of Thin-Walled Sections Undergoing Local and Distortional Buckling, Computers and Structures, Vol, 49(3), pp.507-516. https://doi.org/10.1016/0045-7949(93)90051-E
  12. Kwon, Y.B., Kim B.S., and Hancock, G.J. (2009) Compression Tests of High Strength Cold-Formed Steel Channels With Buckling Interaction, Journal of Constructional Steel Research, Vol. 65, pp.278-289. https://doi.org/10.1016/j.jcsr.2008.07.005
  13. Salhab, B. and Wang, Y.C. (2008) Effective Thickness of Cold-Formed Thin-Walled Channel Sections with Perforated Webs under Compression, Thin-Walled Structures, Vol. 46, pp.823-838. https://doi.org/10.1016/j.tws.2008.01.029
  14. Salmi, P. (1998). Design of web-perforated steel wall studs, 4th Finnish Steel Structures R&D days, Lappeenrante, Finland.
  15. Standard Australia (2005) Cold-Formed Steel Structures AS/NZS 4600: 2005, Sydney, Australia.
  16. Venkataramaiah, K.R. and Roorda, J. (1982) Analysis of local plate buckling experimental data, Proc., 6th Int. Specialty Conf. on Cold-Formed Steel Struct., Univ. of Missouri-Rolla,, St. Louis, Mo, pp.45-74.
  17. Wang Y.C. and Salhab, B. (2009) Structural Behavior and Design of Light Weight Structural Panels Using Perforated Cold-Formed Thin-Walled Sections under Compression, International Journal of Steel Structures, Vol. 9, No. 1, pp.57-67. https://doi.org/10.1007/BF03249480

Cited by

  1. Earthquake Resistance of Modular Building Units Using Load-Bearing Steel Stud Panels vol.25, pp.5, 2013, https://doi.org/10.7781/kjoss.2013.25.5.519
  2. Boosting machines for predicting shear strength of CFS channels with staggered web perforations vol.34, pp.None, 2012, https://doi.org/10.1016/j.istruc.2021.09.060