Journal of the Computational Structural Engineering Institute of Korea (한국전산구조공학회논문집)

Computational Structural Engineering Institute of Korea (한국전산구조공학회)
권호 표지
DOI QR코드

DOI QR Code

Nonlinear Finite Element Analysis on Global and Distortional Buckling of Cold-Formed Steel Members

냉간성형강재의 전체좌굴 및 뒤틀림좌굴에 대한 비선형유한요소해석

  • Received : 2014.01.29
  • Accepted : 2014.04.14
  • Published : 2014.04.30
Download PDF
⟨ Previous Next ⟩

Abstract

This paper presents modelling approaches for the global and distortional buckling of cold-formed built-up steel sections using the finite element software packages, ANSYS and ABAQUS. Thin thickness of the cold-formed steel causes nonlinear behaviour due to local and distortional buckling, thus careful consideration is required in modelling for numerical analysis. Implicit static modelling using ANSYS provides unstable numerical results as the load approaches the limit point but explicit dyamic modelling with ABAQUS is able to display the behaviour even in post-buckling range. Meanwhile, axial load capacities obtained from the numerical analysis show higher values than the experimental axial capacities, due to eccentricity during the test. Axial capacities of the cold-formed steel obtained through numerical analysis requires reduction factor, and this paper suggests 0.88 for the factor.

본 논문에서는 범용 유한요소프로그램 ANSYS와 ABAQUS를 이용하여 냉간성형강으로 조립한 조립기둥의 전체좌굴과 뒤틀림좌굴에 대한 비선형해석을 위한 모델링 기법을 소개한다. 냉간성형강의 경우 두께가 얇아서 국부좌굴 등 비선형거동을 보이기 때문에 좌굴에 대한 해석에 매우 섬세한 모델링이 필요하다. ANSYS의 내연적정적모델링에 의한 해석은 좌굴 극한점 부근에서 수렴의 문제를 발생하였지만, ABAQUS의 외연적동적모델링의 경우에는 좌굴 및 좌굴이후의 부재 거동에 대해서 안정적인 결과를 제공하였다. 또한 수치해석 결과는 좌굴실험을 통해 얻어진 축내력에 비해 높은 내력을 보여주고 있다. 이는 실험과정에서 발생하는 편심에 의한 영향으로서 수치해석에 의한 좌굴내력에 적정한 보정치의 적용이 필요하며 본 논문에서는 기존 실험데이터와의 비교를 통해 0.88의 값을 제시한다.

Keywords

References

  1. ABAQUS (2007) User's Manual, Version 6.7, Hibbitt, Karlsson and Sorensen, HKS Inc., RI
  2. AIK (1999) Design Specification for Cold-Formed Steel Section, Kimoondang, Korea
  3. AISI (2007) North American Specification for the Design of Cold-Formed Steel Structural Members, American Iron and Steel Institute, Washington DC.
  4. ANSYS (2007) ANSYS Software and Manual, ANSYS Inc., PA.
  5. Ashraf, M., Gardner, L., Nethercot, D.A. (2005) Strength Enhancement of Corners Regions of Stainless Steel Cross Sections, Journal of Constructional Steel Research, 61(1), pp.37-52. https://doi.org/10.1016/j.jcsr.2004.06.001
  6. Bakker, M.C.M., Pekoz, T. (2003) The Finite Element Method for Thin-walled Members-basic Principles, Thin-Walled Structures, 41(2), pp.179-189. https://doi.org/10.1016/S0263-8231(02)00086-1
  7. Biggs, K.A. (2007) Axial Load Capacity Cold-Formed Built-Up Members, Master's Thesis, School of Civil Engineering and Environmental Science, University of Oklahoma, OK.
  8. Brueggen, B., Ramseyer, C. (2003) Cold-Formed Steel Joist Member Buckling Capacity Testing, Technical Report, Fears Structural Engineering Laboratory, University of Oklahoma, OK.
  9. Crisfield, M.A. (1998) Non-Linear Finite Element Analysis of Solids and Structures, Volume 1: Essentials, John Wiley & Sons, New York, USA.
  10. Hancock, G.J., Murray, T.M., Ellifritt, D.S. (2001) Cold-Formed Steel Structures to the AISI Specification, Marcel Dekker, Inc., New York, USA.
  11. Whittle, J.K. (2007) Buckling Capacities of Axial Loaded Cold-Formed Built-Up Members, Master's Thesis, School of Civil Engineering and Environmental Science, University of Oklahoma, OK.