Abstract
This paper explores an attempt to experimentally investigate the axial capacity of prismatic and pretwisted structural steel sections under pinned-ended conditions. The main aim is to study the improvement in the elastic and inelastic buckling capacity for a selected Universal Column (UC100 × 100 × 17) section due to pretwisting. Short and slender UC sections were permanently twisted at a range of rotations between 0° and 60°, then tested under axial compression. The experimental results were utilized to verify a nonlinear finite element model that was developed to carry out a parametric investigation to incorporate several more lengths, angles of twists, and boundary conditions for the same UC section. Results revealed that pretwisting is more effective in improving the elastic buckling of slender columns since elastic buckling is primarily influenced by the section’s inertia as opposed to inelastic buckling which is affected by material yielding as well. Considerable buckling capacity improvement of up to 50% was achieved for fixed-ended pretwisted columns.
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