Cantilever with Torsion
Model to Download
I get the message "Existing torsion -> no stability design possible." Why does this appear and what can I do?
This warning appears because the torsion is not considered in the equivalent member design of Eurocode.
You can either neglect the torsion at your own discretion and on your own responsibility by setting the limits in the "Details" dialog box, "Stability" tab.
Or, perform the stability analysis for open cross-sections according to the second-order analysis (while considering the warping) with RF‑/STEEL Warping Torsion or RF‑/FE‑LTB (see Links below).
Very small torsional moments in the members to be designed often prevent certain design formats.
SHAPE-THIN determines the effective cross-sections according to EN 1993-1-3 and EN 1993-1-5 for cold-formed sections. You can optionally check the geometric conditions for the applicability of the standard specified in EN 1993‑1‑3, Section 5.2.
The effects of local plate buckling are considered according to the method of reduced widths and the possible buckling of stiffeners (instability) is considered for stiffened sections according to EN 1993-1-3, Section 5.5.
As an option, you can perform an iterative calculation to optimize the effective cross-section.
You can display the effective cross-sections graphically.
Read more about designing cold-formed sections with SHAPE-THIN and RF-/STEEL Cold-Formed Sections in this technical article: Design of a Thin-Walled, Cold-Formed C-Section According to EN 1993-1-3.
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