Abstract
The paper presents the results of experimental testing on specimens and numerical analysis aimed at determining the load-bearing capacity and the critical moment of elastic lateral-torsional buckling of bent two-chord steel columns with a single lacing plane, located in the symmetrical axis of their cross-section. Uses of such built-up members include columns in industrial halls. Experimental tests were carried out on approximately 1:2 scale models, supported by single-span forks with cantilevers, subjected to concentrated forces applied at their ends. In the model tests, the critical resistance to lateral–torsional buckling and the load-bearing capacity were determined for the elements subjected to pure bending. An equivalent bar model was used for numerical analysis using the finite element method supported by ABAQUS software. The results of experimental testing and numerical analysis were found to be well-aligned with one another. The equivalent torsion section constant for the two-chord section analysed was determined by comparing the results of experimental testing to numerical calculations. The results were obtained by solving the appropriate differential equation for lateral–torsional buckling as formulated in Vlasov’s theory. The paper presents conclusions relating to implementation of the results in designing applications.
Published Version
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