(This document is an excerpt from AISI S North American Standard for Cold Formed Steel Framing – Lateral. Design for convenience only, and should be. Documento 8 – AISI S Standard and Commentary – Committee Use (11!27! 07) – Download as PDF File .pdf), Text File .txt) or read online. AISI S/S ().iv Steel Framing Alliance and the Canadian Sheet Steel Building Institute. North American Standard For Cold-Formed Steel Framing .
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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. This has been an often asked question by framing design engineers.
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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. The ends of a built-up compression member are connected by a weld having a length not less than the maximum width of the member or by connectors spaced longitudinally not more than 4 diameters apart for a s123-07 equal to 1. This new chapter lists applicable AISI test standards for cold-formed steel framing members, connections, and systems.
Inthe manufacturing tolerance values were extended to the flange width and stiffening lip length.
Leave a Comment Click here to cancel reply. The effective strip method is permitted to be used within the following range of parameters:.
First Name Last Name. Beneficial for the design engineer is a new Effective Strip Method that enables the calculation of the nominal in-plane shear wall strength for Type Ajsi shear walls Figure 2.
STRUCTURE magazine | Cold-Formed Steel Framing Standards
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. This chapter provides installation requirements previously contained in the various framing standards. Format defines design considerations. S21-07 computational method is applicable for walls sheathed with steel sheet. The use of ASTM E results in higher nominal shear strength values as compared with the cantilever test method historically used for steel deck diaphragms.
ASTM C has historically stipulated manufacturing tolerances for cold-formed steel structural framing aksi. Section reference table S and previous standard. This chapter contains design provisions for cold-formed steel framing members and assemblies, as previously included in AISI S, S, S, and S This method provides an alternative approach to determine the shear wall strength, especially for those that are outside the limitations of the tested systems.
This newly aizi chapter provides minimum requirements for quality control and quality s2213-07 for material control and installation for cold-formed steel light-frame construction.
For roof or floor diaphragms with a maximum aspect ratio of 4: From tothe S213-7 Committee on Framing Standards developed nine different framing standards to cover specific aspects of cold-formed steel framing. 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.
Effective strip method model for steel-sheet sheathing. The discrete braces are limited to not greater than 8 feet 2. The truss component structural performance load test and full-scale truss confirmatory test methods, previously included in AISI S, are provided in this appendix. The previous design standards limited their application wisi framing members having a maximum base steel thickness to mils 0.
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Six of these standards addressed the design of structural elements, such as general provisions, wall studs, floor joists, trusses, headers, and shear walls. The chapter also includes:. 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. This chapter contains design, manufacturing quality criteria, and installation requirements for cold-formed steel trusses as previously included in AISI S Your message Submit Comment.
The exception applies where the built-up section is seated properly in a track, and the top and bottom end bearing detail of 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 simple reason is, it was easier to develop small single-topic documents versus a more comprehensive multi-topic document. The other standards addressed such topics as a code of standard practice, the definition of standard product, and prescriptive design for residential applications. This new standard includes design provisions for wall systems, floor and roof systems, lateral force-resisting systems, as well as truss and header assemblies.
This new exception provides for a more economical built-up member, as is often used as a jamb stud or shear wall boundary member. 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.
But, why would AISI develop six discrete framing standards as opposed to one design manual? These cold-formed steel framing standards are available as free downloads at www. Sheathing and discrete bracing. Also, for ease of use, S contains a section reference table between the S provisions and the previous provisions Table 2.
The method assumes a sheathing strip carries the lateral load via aiisi field action.