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Effect of angle stiffeners on the flexural strength and stiffness of cold-formed steel beams

  • Dar, M. Adil (Department of Civil Engineering, Indian Institute of Technology Delhi) ;
  • Subramanian, N. ;
  • Rather, Amer I. (Department of Civil Engineering, National Institute of Technology Srinagar) ;
  • Dar, A.R. (Department of Civil Engineering, National Institute of Technology Srinagar) ;
  • Lim, James B.P. (Department of Civil & Environmental Engineering, University of Auckland) ;
  • Anbarasu, M. (Department of Civil Engineering, Government College of Engineering Salem) ;
  • Roy, Krishanu (Department of Civil & Environmental Engineering, University of Auckland)
  • Received : 2019.01.13
  • Accepted : 2019.10.01
  • Published : 2019.10.25

Abstract

Cold-formed steel (CFS) sections when used as primary load carrying members often require additional strengthening for retrofitting purposes. In some cases, it is also necessary to reduce deflections in order to satisfy serviceability requirements. The introduction of angle sections, screwed to the webs so as to act as external stiffeners, has the potential to both increase flexural strength as well as reduce deflections. This paper presents the results of ten four-point bending tests, on built-up CFS sections, both open and closed, with different stiffening arrangements. In the laboratory tests, the stiffening arrangements increased the moment capacity and stiffness of the CFS beams by up to 85% and 100% respectively. The increase in moment capacity was more evident for the open sections, while that reduction in deflection was largest for the closed sections.

Keywords

cold-formed steel;experiment;stiffening arrangements;buckling;flexural strength