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Steel and Composite Structures
  Volume 4, Number 1, February 2004 , pages 49-75

Distortional buckling formulae for cold-formed steel rack-section members
N. Silvestre

    The paper derives, validates and illustrates the application of GBT-based formulae to estimate distortional critical lengths and bifurcation stress resultants in cold-formed steel rack-section columns, beam and beam-columns with arbitrarily inclined mid-stiffeners and four support conditions. After a brief review ofrnthe Generalised Beam Theory (GBT) basics, the main concepts and procedures employed to obtain the formulae are addressed. Then, the GBT-based estimates are compared with exact results and, when possible, also with values yielded by formulae due to Lau and Hancock, Hancock and Teng et al. A few remarks onrnnovel aspects of the rack-section beam-column distortional buckling behaviour, unveiled by the GBT-based approach, are also included.
Key Words
    distortional buckling; distortional buckling formulae; generalised beam theory (GBT); racksection members; flexural end support conditions; warping end support conditions.
Department of Civil Engineering, IST, Technical University of Lisbon,rnAv. Rovisco Pais, 1049-001 Lisboa, Portugalrn

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