FAQ 004472 EN
Why is there a fully plastic section modulus Zfull and a maximum plastic section modulus Zmax displayed for some cross-sections?
Answer
The fully plastic section modulus Zfull is related to the full-plastic bending moment Mpl,full. For Mpl,full, there is only one internal force available in the respective direction. It is not possible to increase this internal force, even if the cross-section is not perfectly plastic.
On the other hand, the maximum plastic bending moment Mpl,max related to the maximum plastic section modulus Zmax refers to the perfectly plastic state of the cross-section. In this case, the interaction of the internal forces in the y- and z-direction is possible.
Keywords
Fully plastic Section modulus Perfectly plastic Plastic Bending moment
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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)
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Why are my steel members not being designed for stability in RF-STEEL AISC?
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