• computational modelling of geometric imperfections and buckling strength of cold-formed steel

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1394/01/01
    • تاریخ انتشار در تی پی بین: 1394/01/01
    • تعداد بازدید: 505
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     computational modelling of the buckling strength of cold-formed steel members as influenced by initial geometric imperfections is studied. the geometric imperfections are represented by the member eigenmode shapes. along with the classical measure — the amplitude of imperfections, an energy measure defined by the square root of the elastic strain energy hypothetically required to distort the originally perfect structural element into the considered imperfect shape is used. based on the measures, two approaches for the choice of the most unfavourable imperfections are suggested. normalising imperfections by the amplitude, the energy measure is calculated as indicative parameter of imperfection significance. vice versa, when adopting normalisation by the energy measure, the amplitude is used as a supporting parameter. the suggestions are illustrated on calculating the strength of an axially compressed steel lipped channel column with eigenmodes exhibiting local-distortional interactions. for eigenvalue and geometrically and materially non-linear strength calculations, the fem codes msc.nastran and cosmos/m are employed.

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