TrusSteel - Cold Formed Steel Trusses

1 2 3 4 5 6 7 8 3.02 Applicable Building Code Building construction in the US was governed by one of three model building codes: UBC, SBC or BOCA. These three codes have been incorporated into the International Building Code (IBC). The IBC, as developed by the International Code Council (ICC), has been adopted by municipalities and will be the applicable model code for the vast majority of construction within the USA. The provisions of the applicable building code will provide important factors in the design of any given project. One of the first steps a Building Designer undertakes in the design of any building is the identification of the applicable codes. There can be different versions of the same building code (e.g. different publication dates) in use. There are also instances when a city or an entire state may decide to publish its own building code. Requirements for Design Completion Once the Building Designer has ascertained the applicable code, they can discover the minimum requirements for design completion that the municipality has set forth for its jurisdiction. Most municipalities state that they require a 100% complete design at the time of permitting. Selecting the Structural System One of the most important decisions made during building design will be the selection of the structural system. Once a system is selected, the Building Designer will go to the applicable code and find the provisions that will control the design of the structural elements. For CFS systems, the "Steel" chapter of the code will present these provisions. The applicable building code will either completely outline the design procedures for a particular material or it will reference the required design standard. If a design standard is referenced, this will be clearly stated in the building code and the Building Designer can proceed to the "Referenced Standards" chapter to locate the proper design standard. Design Standards Model building codes contain provisions for the design of almost any type of building using many types of materials, including CFS. The International Building Code (IBC) will determine the design provisions for construction with CFS in two different ways. The first way is to provide explicit provisions that are published within the Code. The second way is to adopt existing standards by reference. For the IBC to adopt a standard by reference, that standard must be developed according to guidelines created by the American National Standards Institute (ANSI). As with any building material, CFS members are designed according to standards developed by industry organizations that are intimately familiar with the design of CFS members. In the CFS truss industry, the American Iron and Steel Institute (AISI) is the organization that is ANSI-approved to develop standards. Within the AISI, there are two ANSI standards writing committees: the Committee on Specifications (AISI/COS) and the Committee on Framing Standards (AISI/COFS). The AISI/COS has developed the primary standard for CFS design that is in use today: the AISI S240, North American Standard for Cold- Formed Steel Structural Framing. This standard outlines what types of steel shall be considered as CFS and how CFS members shall be designed when subjected to moment, shear and axial forces. The standards developed by the AISI/COFS use this document as their baseline for design procedures and expand upon specific issues of the given framing type. BUILDING CODES & DESIGN STANDARDS AISI / COFS Standards The AISI/COFS has developed eight standards that are in use today: • General Provisions (AISI-S240-15-Chapter A:) • Code of Standard Practice (AISI-S202-15) • Wall Stud Design (AISI-S211-07 w/S1-12 2012) • Header Design (AISI-S212-07 2012) • Lateral Design (AISI-S213-07 w/S1-09 2012) • Truss Design (AISI-S240-15-Chapter E:) • Prescriptive Method for One and Two-Family Dwelling (AISI-S230-15) Of the eight AISI standards listed above, General Provisions, Truss Design and the Code of Standard Practice documents affect the design and fabrication of CFS trusses. These standards are subject to periodic revision. Please check the AISI website for the most current revisions. ENGINEERED BY ALPINE S P E C I F Y I N G / D E S I G N I N G

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