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When to use AISI vs. AISC in regards to material thickness?

When to use AISI vs. AISC in regards to material thickness?

When to use AISI vs. AISC in regards to material thickness?

(OP)
Does anyone know if there is a reference to the recommended minimum thickness one should consider when designing per AISI (cold formed Steel) or the provisions of AISC? I've seen 1/8" as a rule of thumb, but I want to know where that is coming from.

RE: When to use AISI vs. AISC in regards to material thickness?

It depends on how the steel is processed. Which is mainly hot-rolled or cold-form.
Per the attached link
“Cold-formed steel (CFS) members... ...These types of sections are cold-formed from steel sheet, strip, plate, or flat bar in roll forming machines, by press brake (machine press) or bending operations. The material thicknesses for such thin-walled steel members usually range from 0.0147 in. (0.373 mm) to about ¼ in. (6.35 mm). Steel plates and bars as thick as 1 in. (25.4 mm) can also be cold-formed successfully into structural shapes (AISI, 2007b).”

Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.

RE: When to use AISI vs. AISC in regards to material thickness?

In the 2005 AISC specification, a user note in section A1 recommends using AISI for members that are cold-formed with elements not thicker than 1". (Except for HSS shapes, which are often cold-formed.)

RE: When to use AISI vs. AISC in regards to material thickness?

AISI provisions are applicable up to 1" for cold-formed members as noted. AISC generally is viewed as applicable down to around 1/8" for members that are not cold-formed. For example, a 0.120" thick web on a beam would follow AISC, while the same 0.120" in a roll-formed C-section would follow AISI. The dividing line for connections is defined as 3/16" in the AISI specification.

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