On the mechanics of thin-walled angle column instability

• Published in: Thin-walled structures 2012-03, Vol.52, p.80-89
• Main Authors: Dinis, Pedro B., Camotim, Dinar, Silvestre, Nuno
• Format: Article
• Language: English
• Subjects: Buckling; Buckling and post-buckling mechanics; Equal-leg angles; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Generalised Beam Theory (GBT); Inelasticity (thermoplasticity, viscoplasticity...); Physics; Shell finite element analysis; Solid mechanics; Static elasticity (thermoelasticity...); Structural and continuum mechanics; Thin-walled columns; Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
• ISSN: 0263-8231; 1879-3223
• DOI: 10.1016/j.tws.2011.12.007

This paper reports the results of a numerical investigation aimed at providing fresh insight on the mechanics underlying the buckling and (mostly) post-buckling behaviour of short-to-intermediate equal-leg thin-walled angle steel columns exhibiting fixed and pinned (but with the secondary warping prevented) end supports. Although most of the numerical results presented and discussed were obtained through Abaqus shell finite element analyses, the paper also includes some GBT-based critical stresses and buckling mode shapes, whose interpretation help clarifying the distinction between local and global buckling. The shell finite element results displayed consist of (i) elastic post-buckling equilibrium paths and (ii) curves and diagrams providing the evolution, along a given path, of the column deformed configurations and normal stress distributions. ► Fresh insight on the elastic buckling and post-buckling mechanics thin-walled angle columns. ► Fixed-ended and pin-ended (but with the secondary warping prevented) columns analysed. ► GBT and ABAQUS shell finite element numerical results presented and discussed. ► Critical buckling loads and mode shapes, post-buckling paths, deformed configurations and stress distributions.