Behaviour and design of fixed-ended steel equal-leg angle section columns

• Published in: Journal of constructional steel research 2021-07, Vol.182, p.106649, Article 106649
• Main Authors: Behzadi-Sofiani, Behnam, Gardner, Leroy, Wadee, M. Ahmer, Dinis, Pedro B., Camotim, Dinar
• Format: Article
• Language: English
• Subjects: EC3 design procedure; Equal-leg angles; Fixed-ended angle columns; Reliability assessment; Torsional-flexural buckling; Torsional-flexural strength
• ISSN: 0143-974X; 1873-5983
• DOI: 10.1016/j.jcsr.2021.106649

The mechanical behaviour and design of fixed-ended steel equal-leg angle section members subjected to axial compression are addressed in this study. First, the critical buckling behaviour is described. Experimental data on steel equal-leg angle section columns collected from the literature are then used for the validation of numerical (shell finite element) models, developed within the commercial package ABAQUS. Validation is performed by means of comparisons between test and numerical results, considering ultimate loads and failure modes, all of which are shown to be generally in good agreement. A numerical parametric study is then presented considering steel angle section columns with a wide range of slenderness values. The behaviour and load-carrying capacity of the columns is shown to be dependent on, not only the column slenderness, but also the ratio of the elastic torsional-flexural buckling load to the elastic minor-axis flexural buckling load. Finally, the collected experimental and generated numerical results are used to develop a new design approach, suitable for incorporation into future revisions of Eurocode 3, for fixed-ended steel equal-leg angle section columns, reflecting the observations made. The proposed approach offers improved accuracy and consistency in strength predictions compared to the existing codified design rules. The reliability of the new design approach, with a recommended partial safety factor γM1 = 1.0, is verified following the EN 1990 procedure. [Display omitted] •Critical buckling behaviour of fixed-ended equal-leg angle section columns is described.•Developed finite element models are validated against existing test results from the literature.•Numerical parametric study is conducted considering steel equal-leg angle section columns.•Elastic post-buckling behaviour of fixed-ended equal-leg angle section columns is studied.•Collected experimental and generated numerical results are used to develop a new design approach.•Accuracy and reliability of the new design approach are assessed and verified.