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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An often employed assumption by inexperienced cold-formed steel design engineers is that each stud in a stud pack has the same tributary area as a typical wall stud. Read Full Article Hide Comments. He is credited with helping to pioneer and expand the use of cold-formed steel framing in structural and nonstructural applications.
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.
A new location for truss test methods, which were moved from Section E7 to Appendix 2. One of the common methods of bridging anchorage consists of flat-strap cross aisi s211 attached from the bridging line to the bottom aisi s211 the wall on each side of the stud Figure 2.
Anchorage of bridging using flat-strap cross bracing. Making this assumption can lead to a suspect load path or an uneconomical, design as any synergy of the individual stud pack members is not accounted for in the design. Built-up aisi s211 steel compression members are commonly used as shear wall chord members, and at openings of doors and windows stud packs to resist the additional aisi s211 transferred from an opening header.
For a numerical design example illustrating the design of a aisi s211 member and its anchorage, refer to Cold-Formed Steel Engineers Institute TN W, www. Save my name, email, and website in this browser for the next time Aisi s211 comment. The use of a weldment or HSS member is an option for the built-up member if larger capacity and stiffness are desired.
When the bridging member is a cold-rolled aisk inserted through the punch-outs of the studs, the concept of anchoring the bridging to the bottom of the wall can also be achieved with a diagonal piece of a stud or track welded to the bridging line and a211 bottom track, as shown in Figure 3. The system functions in tension only to transfer cumulative bridging aisi s211 to the bottom track and the floor slab; thus a cross bracing pattern is required to anchor stud bridging aisi s211 buckling in either direction of the wall.
Bridging anchorage is critical to aisi s211 the load path, and ensuring that the tendency of the studs to buckle in flexural and torsional buckling modes is restrained by the bridging. Welding aisi s211 typically preferred when wall panels are assembled in a panel shop versus being assembled on site. The type of bridging method used will determine the anchorage spacing and the possible anchorage aisi s211.
AISI Publishes S, North American Standard for Cold-Formed Steel Structural Framing
AISI is aisi s211 of 19 member companies, including integrated and electric furnace steelmakers, and approximately associate members who are suppliers to or customers of the aisi s211 industry.
He can be reached at nabil steelnetwork. What this assumption consists of is adding studs to the stud pack equal to the number of studs displaced by an opening.
In ArticlesEngineer’s Notebook Comments 0. Aisi s211 there are various assumptions employed when designing the stud packs.
Standard: AISI S211
AISI S aisi s211 the following AISI standards into one document for easy reference, and thus supersedes all previous editions of these standards: Matsen was a widely respected structural engineer for more than 30 aisi s211 and the founder and principal aisi s211 Matsen Aisi s211 Design Associates, Sisi. The stud acts in bending about its strong axis and transfers the bridging force into the floor slab through a series of clips, as shown in Figure 4.
The built-up stud section should be capable of resisting the applied axial load as an unbraced section, as well as resist the cumulative bridging forces within the plane of the wall. 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.
First Name Last Name. Leave a Reply Cancel reply Aisi s211 email address will aisi s211 be published. Thus, the stud pack is not engineered but, in fact, is simply assembled to provide an equal number of studs as if the opening did not occur.
Stiffness resistance is aisi s211 through a combination of the stiffness of the flat-straps, the stiffness of the bottom track, and the connections between them. This type of anchorage system may also be used with a flat-strap bridging method by using two strong-back studs attaching the web of the strong-back to the flat-strap on each side of the wall, as well as to the top and bottom track.
AISI S integrates the following AISI standards into one document for easy reference, and thus supersedes all previous editions of these standards:. It should be pointed out that the bridging methods that are capable of resisting load in both tension and compression may require a single anchorage point along the wall length. The forces accumulate and must be aisi s211 periodically as the force in the bridging row reaches the design capacity of the bridging member.
Aisi s211 is available for free download at http: The two strong-back studs aisi s211 not need to be at the same location but may be alternated for ease of installation. Your message Submit Comment. 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 2s11 the wall.
Anchorage of bridging using welded diagonal brace. Your email address will not d211 published. This article provides the design requirements and methods to anchor, or complete aisi s211 load path, for the lateral bracing bridging of axially loaded cold-formed steel stud walls. Aisi s211 designer must specify the stud type and connections to be used based on the cumulative force in the bridging line.
It applies to the design and installation of structural members and connections utilized in cold-formed steel aisi s211 construction applications, including floor aisi s211 roof systems, structural walls, shear walls, strap braced walls and diaphragms to resist in-plane lateral loads, and trusses for load-carrying purposes. Close Explore the durability and resiliency of cold-formed steel z211 when confronted with fire, cold weather, hurricanes, and flooding.
The method of bridging anchorage may vary depending upon the magnitude of aisi s211 force accumulated in the bridging row, as well as the preference of the design engineer.
Built-Up Cold-Formed Steel Compression Member Design –
Another method of bridging anchorage is using a built-up stud column placed at specific intervals along the wall length, such as wall openings, as shown in Figure 5. Thus, a combined loading condition exists, the applied axial load and the bending loads aisi s211 from the bridging row as well as any out-of-plane pressure acting on the built-up column. The design example provides aisi s211 detailed calculations for lateral bracing bridging and bridging anchorage of axially loaded studs, and compares the AISI S and AISI S bracing design alternatives available to design engineers.
The bridging forces are assumed to accumulate linearly with respect to the number of studs, and aisi s211 load path must be completed for the bridging forces. Anchorage of bridging using a strong-back stud. Mar, By Nabil A.