Steel and Composite Structures

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Elastic local buckling behaviour of corroded cold-formed steel columns

  • Nie Biao (School of Transportation Engineering, East China Jiaotong University) ;
  • Xu Shanhua (School of Civil Engineering, Xi'an University of Architecture & Technology) ;
  • Hu WeiCheng (School of Transportation Engineering, East China Jiaotong University) ;
  • Chen HuaPeng (School of Transportation Engineering, East China Jiaotong University) ;
  • Li AnBang (School of Civil Engineering, Xi'an University of Architecture & Technology) ;
  • Zhang ZongXing (Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining & Technology)
  • Received : 2022.12.30
  • Accepted : 2023.05.17
  • Published : 2023.07.10
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Abstract

Under the long-term effect of corrosive environment, many cold-formed steel (CFS) structures have serious corrosion problems. Corrosion leads to the change of surface morphology and the loss of section thickness, which results in the change of instability mode and failure mechanism of CFS structure. This paper mainly investigates the elastic local buckling behavior of corroded CFS columns. The surface morphology scanning test was carried out for eight CFS columns accelerated corrosion by the outdoor periodic spray test. The thin shell finite element (FE) eigen-buckling analysis was also carried out to reveal the influence of corrosion surface characteristics, corrosion depth, corrosion location and corrosion area on the elastic local buckling behaviour of the plates with four simply supported edges. The accuracy of the proposed formulas for calculating the elastic local buckling stress of the corroded plates and columns was assessed through extensive parameter studies. The results indicated that for the plates considering corrosion surface characteristics, the maximum deformation area of local buckling was located at the plates with the minimum average section area. For the plates with localized corrosion, the main buckling shape of the plates changed from one half-wave to two half-wave with the increase in corrosion area length. The elastic local buckling stress decreased gradually with the increase in corrosion area width and length. In addition, the elastic local buckling stress decreased slowly when corrosion area thickness was relatively large, and then tends to accelerate with the reduction in corrosion area thickness. The distance from the corrosion area to the transverse and longitudinal centerline of the plate had little effect on the elastic local buckling stress. Finally, the calculation formula of the elastic local buckling stress of the corroded plates and CFS columns was proposed.

Keywords

Acknowledgement

This work was supported by the Jiangxi Provincial Natural Science Foundation with Grant No. 20224BAB214067, the Science and Technology Research Project of Jiangxi Provincial Department of Education with Grant No. GJJ2200664, the National Nature Foundation of China with Grant No 52178165, No 52208168 and the Key Project for Scientific and Technological Cooperation Scheme of Jiangxi Province with Grant No. 20212BDH80022.

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