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March 2023 #15284 Page #100
Reviewing 2021 IBC Changes for Cold-Formed Steel Light-Frame Design
By Jeff Ellis
“C
hange is the only constant in life” and “When you are finished changing, you are finished” are quotes from the ancient Greek philosopher Heraclitus and Benjamin Franklin, respectively. I’m reminded of them as I review the numerous changes to codes and standards during the typical three to five-year development cycles. While code and standard changes can be challenging to incorporate into our work, they typically offer an improvement or expansion of design and construction solutions. This article will discuss some of the changes from the 2018 to the 2021 IBC related to cold-formed steel (CFS) light-frame design. Long story short, there are no major changes to CFS design provisions from the 2018 to 2021 IBC. Therefore, in addition to quickly discussing some of the 2015 to 2020 changes, I’ll discuss a few major changes that occurred from the 2012 editions to the 2015 and 2016 editions of the IBC referenced specifications and standards. Note that the AISI specifications and standards provide a helpful reference in the front portion of the document that summarizes all the changes and additions from the previous edition. Let’s start by noting the AISI specification and standard editions referenced by the building code. The 2021 IBC references the 2020 editions of the North American Specification for the Design of CFS Structural Members (S100), Standards for CFS Framing (S202, S220, S230, and S240), and Seismic Design of CFS Structural Systems (S400). IBC Section 2210 states that cold-formed steel design is to be per S100 unless it’s for CFS stainless-steel and CFS light-frame construction,
2021 IBC AISI References Table Continued next page
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