limitations inherent in the current AISI-COFS Wall Stud Standard (AISI-S) are noted and discussed. A preliminary list of limit states for sheathed wall studs. vi AISI S () WALL STUD DESIGN TASK GROUP Nabil Rahman. Chairman The Steel Network Jay Larson.J. Trestain Structural Engineering Joe. Find the most up-to-date version of AISI S at Engineering
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However, tension-only bridging systems always require a minimum of two anchorage locations along the wall length to resist the buckling of the wall in either direction. When the bridging s211 is a cold-rolled channel inserted through the punch-outs of the studs, the concept aisi s211 anchoring the bridging to the bottom of the wall can also be aisi s211 with a diagonal piece of a stud or track welded to the bridging line and the bottom track, as shown in Figure 3. An often employed assumption by inexperienced cold-formed steel design engineers is that each stud aisi s211 a stud pack has the same tributary area as a typical wall aisi s211.
Standard: AISI S211
One of the common methods of bridging anchorage consists of flat-strap cross bracing attached from the bridging line to the bottom of the wall on each side of the stud Figure 2. He can aisi s211 reached at nabil steelnetwork. The bridging ausi are assumed to accumulate linearly with respect aisi s211 the number of studs, and the load path must be completed for the bridging forces.
What this assumption consists of is adding w211 to the stud pack equal to the number of studs displaced by an aisi s211. For this type of system, the designer should specify the strap size; thickness and width, as well as the connection requirements at both the bridging line and the bottom track of the wall. Anchorage of bridging using welded diagonal brace. The method of bridging anchorage may vary depending upon aisi s211 magnitude of bridging force accumulated in the bridging row, as well as the preference of the asi engineer.
Built-up cold-formed steel compression aisi s211 are commonly used as shear wall chord members, and at openings of doors and windows stud packs to resist the additional load transferred from an opening header. Matsen was a widely respected structural engineer for more than 30 s121 and the founder and principal of Matsen Aidi Design Associates, Aisi s211.
It should be pointed out that the bridging methods that are capable of resisting load in both tension and aisi s211 may require a single anchorage point along the wall length.
Built-Up Cold-Formed Steel Compression Member Design –
Leave a Reply Cancel reply Your email address will not be published. In ArticlesEngineer’s Notebook Comments 0. Making this assumption can lead to a suspect load path or an uneconomical, design as aisi s211 synergy of the individual stud pack members is not accounted for in the design.
He is credited with helping to pioneer and expand the use of cold-formed aisi s211 framing in structural and nonstructural applications. Welding is typically preferred when wall panels are assembled in a panel shop versus being assembled on site.
AISI Cold-Formed Steel Standards Offered As Free Downloads
wisi The system functions in tension only to transfer cumulative bridging forces to the bottom track and the floor slab; thus a cross bracing pattern is required to anchor aisi s211 bridging for buckling in either direction of aisi s211 wall. The use of a weldment or HSS member is an option for the built-up member if larger capacity and stiffness are desired.
Anchorage of bridging using a strong-back stud. Your message Submit Comment. The stud acts in bending about its strong aisi s211 and transfers the bridging force into the floor slab through a series of clips, as shown in Figure 4.
AISI Publishes S240-15, North American Standard for Cold-Formed Steel Structural Framing
Mar, By Nabil A. Anchorage of bridging using flat-strap cross bracing.
Aisi s211 design example provides the detailed calculations for lateral bracing bridging and bridging anchorage of axially loaded studs, and compares the AISI S and Aisi s211 S bracing design alternatives available to design engineers. Stiffness resistance is obtained by a combination of the stiffness of the bridging member, the stiffness of the strong-back stud, and the stiffness of the connection between them. Close Explore the durability and resiliency aisi s211 cold-formed steel framing when confronted with fire, cold weather, wisi, and flooding.
This article provides the design requirements and methods to anchor, or complete the load path, for the lateral bracing bridging of axially loaded cold-formed steel stud walls. Today there are various assumptions employed aisi s211 designing the stud packs.
Bridging anchorage is critical to completing the load path, and ensuring that the tendency of the studs to buckle in flexural and torsional aiisi modes is restrained by the bridging. The built-up stud section should be capable of resisting the applied axial load as an unbraced section, aisi s211 well as aisi s211 the cumulative bridging forces within the plane of the wall.
AISI serves as the voice of the North American aisi s211 industry in the public policy arena and advances the case for steel in the marketplace as the preferred material of choice. It is available for free download at http: AISI S integrates the following AISI w211 into one document for easy reference, and thus supersedes all aisi s211 editions of these standards:. The two strong-back studs do not need to be at the same aisi s211 but may be alternated for ease of installation.
It applies to aisi s211 design and installation of structural members and connections utilized in cold-formed steel light-frame construction applications, including floor and roof systems, structural walls, shear walls, strap braced walls and diaphragms to resist in-plane lateral loads, and aisi s211 for load-carrying purposes.
The asi accumulate and must be removed periodically as the force in the bridging row reaches the design capacity of the bridging member.