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  • Unconstrained Shape Optimisation of Singly-Symmetric and Open Cold-Formed Steel Beams and Beam-Columns

    Author(s)
    Wang, Bin
    Bosco, Guillaume L
    Gilbert, Benoit P
    Guan, Hong
    Teh, Lip H
    Griffith University Author(s)
    Guan, Hong
    Gilbert, Benoit
    Year published
    2016
    Metadata
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    Abstract
    This study aims to optimise the cross-sectional shape of singly-symmetric, open-section and simply-supported cold-formed steel (CFS) beams and beam-columns. No manufacturing or assembly constraints are considered. The previously developed augmented Lagrangian Genetic Algorithm (GA), referred to as the “self-shape” optimisation algorithm, is used herein. Fully restrained and unrestrained beams against lateral deflection and twist, as well as unrestrained beam-columns are optimised. Various combinations of axial compressive load and bending moment are analysed for the beam-columns. The Direct Strength Method (DSM) is used to ...
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    This study aims to optimise the cross-sectional shape of singly-symmetric, open-section and simply-supported cold-formed steel (CFS) beams and beam-columns. No manufacturing or assembly constraints are considered. The previously developed augmented Lagrangian Genetic Algorithm (GA), referred to as the “self-shape” optimisation algorithm, is used herein. Fully restrained and unrestrained beams against lateral deflection and twist, as well as unrestrained beam-columns are optimised. Various combinations of axial compressive load and bending moment are analysed for the beam-columns. The Direct Strength Method (DSM) is used to evaluate the nominal member compressive and bending capacities. The accuracy of the automated rules, developed in the literature to determine the elastic local and distortional axial buckling stresses from Finite Strip signature curves, is verified herein to estimate the elastic bending buckling stresses. The optimised cross-sectional shapes are presented for all cases and the evolution of the unrestrained shapes from pure axial compression to pure bending is discussed.
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    Journal Title
    Thin-Walled Structures
    Volume
    104
    DOI
    https://doi.org/10.1016/j.tws.2016.03.007
    Subject
    Aerospace engineering
    Civil engineering
    Civil engineering not elsewhere classified
    Mechanical engineering
    Publication URI
    http://hdl.handle.net/10072/142191
    Collection
    • Journal articles

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