AISI Table B4.1-1 Applicability Limits
Answer
The safety factor Ω and resistance factor Φ used in Chapters E through H are only appropriate for sections that comply with the limitations in Table B4.1‑1. For all other sections that exceed any of the limits, higher safety factors Ω or lower resistance factors Φ are applied according to section A1.2(C). In RFEM, this limitation is checked by default. The user has the option to deactivate this check in the "Strength Configuration".
Shapes that can be checked in RFEM include C, Z, L, I (double back-to-back C), hat, rectangular, and round HSS. In the example shown in Image 02, the 8ZS2.75 x 105 section meets the applicability limits.
For general/complex sections, such as the sigma section used in Example III‑14 of AISI D100‑17 (shown in Image 03), the more conservative factors are automatically applied. As a result, Φc = 0.80 is used in the RFEM design checks. However, the manual calculation shows that the sigma section actually meets the applicability limits and Φc = 0.85 can be used instead.
Keywords
Custom Section Channels Hats Z Shapes AISI Cold-Formed Steel Design Sections Shapes Thin Walled Section Applicability Limit
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AISI Cold-Formed Steel Design in RFEM 6
The design of cold-formed steel members according to the AISI S100-16 is now available in RFEM 6. Design can be accessed by selecting “AISC 360” as the standard in the Steel Design add-on. “AISI S100” is then automatically selected for the cold-formed design (Image 01).
