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
|Published (Last):||4 November 2016|
|PDF File Size:||8.56 Mb|
|ePub File Size:||13.23 Mb|
|Price:||Free* [*Free Regsitration Required]|
For a numerical design example illustrating the design of a bridging member and its anchorage, refer aisi s211 Cold-Formed Steel Engineers Institute TN W, www.
The two strong-back studs do not need to be at the same location but may be alternated for ease of installation. The bridging forces are assumed to accumulate linearly with respect to the number of studs, and the load path must be completed for the bridging aisi s211.
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. Aisi s211, tension-only bridging systems always require a minimum of two aisi s211 locations along the wall length to resist the buckling of the xisi in either direction.
aisi s211 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. He is credited with helping to pioneer and expand the use of cold-formed steel framing in structural and nonstructural applications. The aisi s211 functions in tension only to aisi s211 cumulative bridging forces to the bottom track and the floor slab; thus a cross bracing pattern is required to anchor stud bridging for buckling in either direction of the wall.
AISI S integrates the following AISI standards into one document for easy reference, and thus supersedes all previous editions of these standards: Read Aisi s211 Article Hide Comments.
The built-up stud section should be capable of resisting the applied axial aisi s211 as an unbraced section, as well as resist the cumulative bridging forces within the plane of the wall. The forces accumulate and must be removed periodically as the force in the bridging row reaches aisi s211 design capacity of the bridging member.
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.
The designer must specify the stud type and connections to be used based on the aisi s211 force in the bridging line. Anchorage of bridging using flat-strap cross bracing. Thus, the stud pack is not engineered but, in fact, is simply assembled to provide an equal number of studs as if aisi s211 opening did not occur.
Built-up cold-formed steel compression members are commonly used as shear wall chord members, and at openings of doors and windows stud aisi s211 to resist the additional load transferred from an opening aisi s211.
The method of bridging anchorage may vary depending upon the magnitude of bridging force accumulated in the bridging row, as well as the preference of the design engineer. AISI is comprised of 19 member companies, including aisi s211 and electric furnace steelmakers, and approximately associate members who are suppliers to or customers of the steel industry.
Anchorage of bridging using welded diagonal brace.
A aisi s211 location for truss test methods, which were moved from Section E7 to Appendix 2. 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. Matsen was a widely respected structural engineer for more than 30 years and the founder and principal of Matsen Ford Design Associates, Inc.
The type of bridging method used will determine the anchorage spacing and the possible anchorage methods. Mar, By Nabil A. What this assumption consists of is adding studs to the stud pack equal to the number of studs displaced by an opening. He can be reached at nabil steelnetwork. Stiffness resistance is obtained through a combination of the stiffness of the flat-straps, the stiffness aisi s211 the bottom track, and the connections between them. 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 aisi s211.
Today there are various assumptions employed when designing the stud packs. Your email address will not be published.
Your message Submit Comment. This type of anchorage system may also be used with a flat-strap bridging method aisi s211 using two strong-back studs attaching the web of the aisi s211 to the flat-strap on each side of the wall, as well as to the top and bottom track. AISI serves as the voice of the North American steel industry in the public policy arena and advances the case for aisi s211 in the marketplace as the preferred material of choice. AISI S integrates the following AISI standards into one document for easy reference, and thus supersedes all previous editions of these standards:.
When the bridging member aisi s211 a cold-rolled channel inserted through the punch-outs of the aisi s211, the concept of anchoring the bridging to the bottom of the wall can also be achieved with a diagonal piece of aisi s211 stud or track welded to the bridging line and the bottom track, as shown in Figure aisi s211.
The design example provides the detailed calculations for lateral bracing bridging aisi s211 bridging anchorage of axially loaded studs, and compares the AISI S and AISI S bracing design alternatives available to design engineers. 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. Anchorage of bridging using a strong-back stud.
Leave a Comment Click here to cancel reply.
First Name Last Name. Leave a Aisi s211 Cancel reply Your email address will not be published. It applies to the design and installation of structural aisi s211 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 trusses for load-carrying purposes.
Save my name, email, and website in this browser for the next time I comment.
Built-Up Cold-Formed Steel Compression Member Design –
One of the common methods of bridging anchorage aisi s211 of flat-strap cross bracing attached from the bridging line to the bottom of the wall on each side of the stud Figure 2. Welding is typically preferred when wall aaisi are assembled in a panel shop versus being assembled on site. Anchorage of bridging aisi s211 a built-up section. Thus, a combined loading condition exists, the applied axial load and the aisi s211 loads induced from the bridging row as well as any out-of-plane pressure acting on the built-up column.
In ArticlesEngineer’s Notebook Comments 0. 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.
Bridging anchorage is critical to completing the load path, aisii ensuring that the tendency of the studs to buckle in flexural and aisi s211 buckling modes is restrained by the bridging.
Close Explore the durability and resiliency of cold-formed z211 framing when confronted with fire, cold weather, hurricanes, and flooding.
The use of a weldment or HSS member is an option aisi s211 the built-up member if larger capacity and stiffness are desired.