Tech Note F502-18: Attachment of CFS Framing to Precast, Post-Tensioned, and Hollow-Core Concrete
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Summary: Precast, prestressed, tilt-up, cast-in-place, and post-tensioned concrete are commonly used in podium construction. It is inevitable that the cold-formed steel design engineer will sooner or later be challenged with attaching cold-formed steel framing to podium construction. Towards this end, it is important for the designer to have a basic understanding of common precast concrete components and why connecting to them can be such a challenge. This Tech Note discusses the types of precast concrete components as well as the cold-formed steel anchorage options.
Disclaimer: Designs cited herein are not intended to preclude the use of other materials, assemblies, structures or designs when these other designs demonstrate equivalent performance for the intended use. CFSEI documents are not intended to exclude the use and implementation of any other design or construction technique.
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Tech Note F102-21: Screw Fastener Selection For Cold-Formed Steel Frame Construction
Summary: Specifying the proper fastener is necessary to assure the proper performance of the connections used in cold-formed steel construction. Cold-formed steel connections primarily utilize externally threaded fasteners, so embedment is not the controlling parameter. Instead, the design of the fastener along with the thickness of the steel govern the value of the connection. This Tech Note provides basic information for determining the appropriate screw type for various applications.
This Technical Note updates and replaces CFSEI Tech Note F102-11
Disclaimer: Designs cited herein are not intended to preclude the use of other materials, assemblies, structures or designs when these other designs demonstrate equivalent performance for the intended use. CFSEI documents are not intended to exclude the use and implementation of any other design or construction technique.
Tech Note F300-09: Pneumatically Driven Pins for Wood Based Panel Attachment
Summary: Wood based panels for shear wall and horizontal diaphragms have traditionally been attached to cold-formed steel framing using tapping screws. To increase the speed of installation and to reduce the amount of labor used making these attachments, several companies supply pneumatic nailing systems. These products allow wood-based panels to be fastened to steel in a manner similar to which panels are nailed to wood framing. This Technical Note provides information on specifications, selection and field inspection of pneumatic drive pins.
This Technical Note updates and replaces LGSEA Technical Note 561b.
Disclaimer: Designs cited herein are not intended to preclude the use of other materials, assemblies, structures or designs when these other designs demonstrate equivalent performance for the intended use. CFSEI documents are not intended to exclude the use and implementation of any other design or construction technique.
Tech Note F101-12: Screws for Cold-Formed Steel-To-Wood and Wood-To-Cold-Formed Steel Attachments
Summary: Screws are often used to attach cold-formed steel (CFS) framing to wood members or wood structural panel decking to CFS joists or rafters. The AISI North American Specification for the Design of Cold-Formed Steel Structural Members (AISI S100) provides design equations for screw connection capacity for CFS members. The National Design Specification for Wood Construction (NDS) provides design equations for fastener/connection capacity (nails, wood screws, bolts, etc.) in wood members. The Engineered Wood Association (APA) and the building codes offer several resources for determining the capacity of screw connections attaching wood sheathing. This Tech Note reviews these resources and discusses design and detailing of these fastener connections.
Disclaimer: Designs cited herein are not intended to preclude the use of other materials, assemblies, structures or designs when these other designs demonstrate equivalent performance for the intended use. CFSEI documents are not intended to exclude the use and implementation of any other design or construction technique.
Tech Note F140-16: Welding Cold-Formed Steel
Summary: In cold-formed steel construction, welding is a viable connection method. Of the various forms of welding, arc welding is most commonly used to join both cold-formed steel members and hardware components. Prefabrication of roof trusses, panelization of walls, and hardware connections are all ideal applications where welding may be the preferred joining method. This Tech Note provides information on the applicable codes, processes, procedures, design considerations, fabrication and inspection.
This Technical Note updates and replaces CFSEI Technical Note F140-10
Disclaimer: Designs cited herein are not intended to preclude the use of other materials, assemblies, structures or designs when these other designs demonstrate equivalent performance for the intended use. CFSEI documents are not intended to exclude the use and implementation of any other design or construction technique.
Tech Note F701-12: Evaluation of Screw Strength
Summary: The design provisions for screw connections contained in the North American Specification for the Design of Cold-Formed Steel Structural Members, AISI S100-07 with 2010 Addendum, contains specific limit states equations that pertain to the design strength of the connecting elements, i.e. sheets. In addition to sheet related design limit states, AISI S100 also provides design provisions for the screw when subjected to either pure shear or pure tension. However, the screw design provisions require that the screw capacity be defined by tests. In the absence of test data, the design engineer is at a loss for evaluating the strength of the screw. This Tech Note provides design guidance for the evaluation of the screw when subjected to pure shear, pure tension and combined shear and tension.
Disclaimer: Designs cited herein are not intended to preclude the use of other materials, assemblies, structures or designs when these other designs demonstrate equivalent performance for the intended use. CFSEI documents are not intended to exclude the use and implementation of any other design or construction technique.
Tech Note B010-21: Introduction to AISI S202, Code of Standard Practice for Cold-Formed Steel Structural Framing
Summary: Understanding the responsibilities of the different parties involved in a cold-formed steel framing project can be confusing. This Technical Note is an introduction to AISI S202, Code of Standard Practice for Cold-Formed Steel Structural Framing published by the American Iron and Steel Institute (AISI).
Disclaimer: Designs cited herein are not intended to preclude the use of other materials, assemblies, structures or designs when these other designs demonstrate equivalent performance for the intended use. CFSEI documents are not intended to exclude the use and implementation of any other design or construction technique.
Tech Note G104-14: Welded Box-Beam Flexure Design
Summary: A box-beam configuration may be used at openings in a floor or wall framing assembly. The AISI S100 contains design provisions for a built-up flexural members consisting of two C-sections back-to-back used as a flexural member. For built-up members to act as one unit (composite), the members must be connected together with sufficient fasteners and spacing. This Tech Note illustrates the extrapolation S100 Section D1.1 provisions to a box-beam configuration.
Disclaimer: Designs cited herein are not intended to preclude the use of other materials, assemblies, structures or designs when these other designs demonstrate equivalent performance for the intended use. CFSEI documents are not intended to exclude the use and implementation of any other design or construction technique.
Tech Note B006-20: Introduction to Evaluation Services and Explanation of Evaluation Reports
Summary: Evaluation reports act as a bridge between authorities having jurisdiction (AHJs) and manufacturers in conveying specific information on building products and systems relative to compliance to codes and standards. When an evaluation report is made available and determined as supporting the product’s use in projects, approval of the code official should be solicited. After such approval is attained, the design and installation details given in the report need to be observed and the labeling of the actual product needs to match the description provided in the evaluation report.
Disclaimer: Designs cited herein are not intended to preclude the use of other materials, assemblies, structures or designs when these other designs demonstrate equivalent performance for the intended use. CFSEI documents are not intended to exclude the use and implementation of any other design or construction technique.