Comment From to , the AISI Committee on Framing Standards developed nine different framing standards to cover specific aspects of cold-formed steel framing. Six of these standards addressed the design of structural elements, such as general provisions, wall studs, floor joists, trusses, headers, and shear walls. The other standards addressed such topics as a code of standard practice, the definition of standard product, and prescriptive design for residential applications. But, why would AISI develop six discrete framing standards as opposed to one design manual? This has been an often asked question by framing design engineers.
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The changes outlined here will be contained in the IRC, which is expected to be published in the fall of this year. These new maps are based on the worst case assumption for Site Class. Significantly, a new set of maps will be provided in Figure Another change in Chapter 3 will clarify that guards are only required on those portions of walking surfaces that are located more than 30 inches above grade, not along the entire surface.
To bring consistency with the IBC, another change will require that staples in treated wood be made of stainless steel. A broad group of parties interested in deck safety, known as the Deck Code Coalition, submitted 17 different code changes with revisions to Section R on decks. Of those, 12 were approved, making significant changes to that section. In the IRC, load-bearing studs were limited to 10 feet in length.
This nail will become more widely used once the higher roof component and cladding forces from ASCE are adopted. The rim board header detail that was added for the IRC was corrected to show that hangers are required in all cases when the joists occur over the wall opening. There were several changes made to the Wall Bracing Section, R The use of the 2. Narrow methods were added to the column headings for the wind and seismic bracing amount tables, to make them consistent, and the methods for adding different bracing were clarified.
When using bracing method PFH, the builder can omit the nailing of the sheathing to the framing behind the strap-type holdown. Finally, offering some relief for high-seismic areas where brick veneer is used, an allowance was added to permit a limited amount of brick veneer to be present on the second floor without triggering the use of the BV-WSP bracing method. A couple of significant changes were made to the prescriptive requirements for cold-formed steel framing.
The requirements for the anchorage of cold-formed steel walls were revised, and the wind requirements for cold-formed steel framing were changed to match the new AISI S prescriptive standard. Finally, it may be helpful to mention some of the proposed changes that were not adopted.
A change to update the IRC wind speed maps, roof component and cladding pressures, component and cladding roof zones, and revise the remainder of wind-based requirements to match ASCE was not approved. Similarly, a proposal to increase the live load on decks, from 1.
Once the IRC is published, it will be time to start a new code change cycle once again, with Group A code changes due January 8, The schedule for the next cycle is already posted here. What changes would you like to see for the codes?
Tag: AISI S230
AISI S230 PDF
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