FAQ 003430 EN
7 August 2019
003430
How is the automatic creation of c/t-parts carried out?
Answer
It is also possible to specify an angle from which a support should be created between two elements. In case that the angle for connection of elements is smaller, they are considered as an interconnected c/t-part. Stiffeners (longitudinal ribs, slopes (lips), or bulges, and so on) are not recognized by the program during the automatic generation of the c/t-parts. The c/t-parts have to be adjusted manually. You can make the changes in Table "1.7 Notional Flat Widths | EN 1993‑1‑3" or in the "Edit Notional Flat Width" dialog box.
The check box for Element is "significant" controls whether a curved element is considered as a c/t-part. If the length of the arc is larger than the diameter entered here, it cannot be neglected.
A corresponding error message appears before the calculation.
The option Element ist "straight" refers to curved elements. The arcs are usually excluded from the determination of the effective widths because the standards do not provide clear specifications. A curved element is assumed to be straight if the ratio of the connecting line (start/end node) to the element length is higher than the specified value.
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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.
Frequently Asked Questions (FAQ)
- How does the calculation of the moments of inertia differ when the cross-section consists of several unconnected or connected partial cross-sections?
- When determining the effective cross-section properties according to EN 1993‑1‑1, EN 1993‑1‑5, or EN 1999̩1‑1, SHAPE‑THIN displays a warning message saying that the effective widths are only determined for straight elements. What does it mean?
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