AISI S—07 () AISI STANDARD North American Standard for. Cold- Formed Steel Framing— Header Design Edition (Reaffirmed ). Revision. AISI S Header Design *. – AISI S Lateral AISI S Prescriptive Method for One and Two . G, Using Chapter F of the NA Specification for the. The Standard for Cold-Formed Steel Framing – Header. Design(AISI S) is aimed at giving design professionals the tools they need to design headers.
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This has been an often asked question by framing design engineers.
Inthe manufacturing tolerance values were extended to the flange width and stiffening lip length. For roof or floor diaphragms with a maximum aspect ratio of 4: This article focuses on AISI S which applies to cold-formed steel structural members subject to gravity loading, wind loading, and seismic loading, except when specific seismic detailing is required.
However, AISI S now incorporates an exception for a built-up axial load bearing section comprised of two studs oriented back-to-back forming an I-shaped cross-section.
ASTM C has historically stipulated manufacturing tolerances for cold-formed steel structural framing members. The scope was selected to provide coverage of the high volume application of cold-formed steel in light-framed construction. Format defines design considerations. However, rather than add to the complexity of the AISI Specification, it was decided that a new family of standards should be developed. Therefore AISI extended its standards development activity to support the growing needs of the cold-formed steel framing industry.
Sheathing and discrete bracing. This appendix contains requirements for the determination of the rotational stiffness that structural sheathing provides to framing members to facilitate the design for distortional buckling. The commentary and explanatory language is identified by a vertical black line along the right margin. First Name Last Name. Yu, Wiley-Interscience Back to top.
This chapter provides installation requirements previously contained in the various framing standards. The simple reason is, it was easier to develop small single-topic documents versus a more comprehensive multi-topic document. Effective strip method model for steel-sheet sheathing. The method assumes s212-0 sheathing strip carries the lateral load via tension field action.
Connection design is limited to s2212-07 a discussion of screw connections. But, why would AISI develop six discrete framing standards as opposed to one design manual?
The other standards addressed aiso topics as a code of standard practice, the definition of standard product, and prescriptive design for residential applications. The chapter also includes:. Six of these standards addressed the design of structural elements, such as general provisions, wall studs, floor joists, trusses, headers, and shear walls.
The discrete braces are limited to not greater than 8 feet 2. These cold-formed steel framing standards are s221-07 as free downloads at www. This chapter contains design provisions for cold-formed steel framing members and assemblies, as previously included in AISI S, S, S, and S The effective strip method is permitted to be used within the following range of parameters:.
Permanent link to this article: Section reference table S and previous iasi. The list of these standards, as well as other excellent design guides, are provided. The exception applies where the built-up section is seated properly in a track, and the top and bottom end bearing detail qisi the studs consists of a steel or concrete support with adequate strength and stiffness to preclude relative end slip of the two built-up stud sections.
The previous design standards limited their application to framing members having a maximum base steel thickness to mils 0. The use of ASTM E results in higher nominal shear strength values as compared with the cantilever test method historically used for s2112-07 deck diaphragms. This method provides an alternative approach to determine the shear wall strength, especially for those that are outside the limitations of the tested systems.
The document addresses the design for a C-shaped cross section as a flexural member and a compression member. This limitation has been eliminated from AISI S; however, it should be remembered that mils is still the maximum thickness of standard products in the United States and 97 mils 0. Although the AISI Specification had gained acceptance and was in widespread use, aiwi were a number of design issues that were not ais addressed for this emerging market.
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STRUCTURE magazine | Cold-Formed Steel Framing Standards
This newly developed chapter provides minimum requirements for quality control and quality assurance for material control and installation for cold-formed steel light-frame construction. This new exception provides for a more economical built-up member, as is often used as a jamb stud or shear wall boundary member.
This new chapter lists applicable AISI test standards for cold-formed steel framing members, connections, and systems. For curtain wall systems, the standard now permits the use of the bracing combination of sheathing attached to one side of the wall stud and discrete bracing for the other flange Figure 1.
It outlines the scope, which is for design and installation of cold-formed steel framing of a floor and roof systems, b structural walls, c shear walls, strap braced walls, and diaphragms to resist in-plane lateral loads, and d trusses for load-carrying purposes in buildings.
This document is intended to serve only as an educational tool. Flexural Members Chapter E: Leave a Comment Click here to cancel reply. Additional explanatory aiisi is also provided. The ends of a built-up compression member are connected by a weld having a length aksi less than the maximum width of the member or by connectors spaced longitudinally not more than 4 diameters apart for a distance equal to 1.
These applications include wall, floor and roof framing in a number of building types. The truss component structural performance load test and full-scale truss confirmatory test methods, previously included in AISI S, are provided in this appendix. From tothe AISI Committee on Framing Standards developed nine different framing standards to cover specific aspects of cold-formed steel framing. This chapter contains design, manufacturing quality criteria, and installation requirements for cold-formed steel trusses as previously included in AISI S Powered by WordPress and the Graphene Theme.
This computational method is applicable for walls sheathed with steel sheet. Your message Submit Comment.