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Page 1: Cold-Formed Steel Framing Members

COLDCOLD--FORMED STEEL FORMED STEEL FRAMING MEMBERS FRAMING MEMBERS

Dr. Roger LaBoubeCurator’s Distinguished Teaching Professor

andDirector

Wei-Wen Yu CenterWei Wen Yu Center for

Cold-Formed Steel Structures

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Goal of This PresentationGoal of This PresentationGoal of This PresentationGoal of This Presentation

Provide overview of coldProvide overview of cold--formed steelformed steelProvide overview of coldProvide overview of cold formed steel formed steel framing members used in the construction framing members used in the construction industryindustryindustry.industry.

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AISI S201: Product DataAISI S201: Product DataAISI S201: Product DataAISI S201: Product Data

AA GENERALGENERALA.A. GENERALGENERALB.B. MATERIALSMATERIALSCC PRODUCTSPRODUCTSC.C. PRODUCTSPRODUCTSD.D. QUALITY QUALITY

ASSURANCEASSURANCEASSURANCEASSURANCE

This Standard definesThis Standard definesThis Standard defines This Standard defines framing member crossframing member cross--sections.sections.

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AISI S201: Product DataAISI S201: Product DataAISI S201: Product DataAISI S201: Product Data

Information Provided:Information Provided: Information Provided:Information Provided: Materials, Coatings and ThicknessMaterials, Coatings and Thickness Shapes and DimensionsShapes and Dimensionspp Designators and MarkingDesignators and Marking Tolerances and Quality AssuranceTolerances and Quality Assurance

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MaterialsMaterialsMaterialsMaterials

Referenced Standard:Referenced Standard: Referenced Standard:Referenced Standard: ASTM A1003: Standard Specification for Steel Sheet, ASTM A1003: Standard Specification for Steel Sheet,

Carbon, MetallicCarbon, Metallic-- and Nonmetallicand Nonmetallic--Coated for ColdCoated for Cold--Formed Framing MembersFormed Framing Members

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ThicknessThicknessThicknessThickness

16 ga

Gage is no longer used as the thickness designator

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CoatingsCoatingsCoatingsCoatings

Referenced Material Standard:Referenced Material Standard:Referenced Material Standard:Referenced Material Standard: ASTM A1003: Standard Specification for Steel ASTM A1003: Standard Specification for Steel

Sheet Carbon MetallicSheet Carbon Metallic-- and Nonmetallicand Nonmetallic--Sheet, Carbon, MetallicSheet, Carbon, Metallic and Nonmetallicand NonmetallicCoated for ColdCoated for Cold--Formed Framing MembersFormed Framing Members

Requirements:Requirements:Requirements:Requirements: Structural: G60 or equivalentStructural: G60 or equivalent

NonNon structural: G40 or equivalentstructural: G40 or equivalent NonNon--structural: G40 or equivalentstructural: G40 or equivalent

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ShapesShapesShapesShapes

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ShapesShapesShapesShapes

SS = Stud or joist= Stud or joistTT = Track= TrackTT = Track= TrackUU = Cold rolled channel= Cold rolled channelFF = Furring (hat) channel= Furring (hat) channelLL = Angle or L= Angle or L headerheaderLL = Angle or L= Angle or L--headerheader

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Cold-Formed C-Shapep

T i ll thi ti i d f ll t dTypically this section is used for wall studs, floor joists, roof joists or ceiling joists.

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Product DesignatorProduct DesignatorProduct DesignatorProduct Designator

600 S 162 - 54

2 or 3 digit numeral indicating base metalthickness in 1/1000 inch (mils) (0.054”)

3 di it l i di ti fl idth i 1/1003 digit numeral indicating flange width in 1/100 inches (1-5/8”), followed by a dash

Letter indicating the type of product (Stud or Joist)Letter indicating the type of product (Stud or Joist)

3 or 4 digit numeral indicating web depth in 1/100 inches (6”)

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StudsStudsStudsStuds

Structural studsStructural studs NonNon--structural studsstructural studs Carry loadsCarry loads 11--5/8” flanges and 1/2” return 5/8” flanges and 1/2” return

lipslips

Not expected to carry axial loadsNot expected to carry axial loads 11--1/4” flanges and 1/4” return 1/4” flanges and 1/4” return

lips, typicallips, typicallips.lips. Thickness from 33Thickness from 33--97 mil97 mil G60 galvanized coatingG60 galvanized coating

p ypp yp Thickness often less than 33 milThickness often less than 33 mil G40 galvanized coatingG40 galvanized coating

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TrackTrackTrackTrackWall stud must be seated in track with Wall stud must be seated in track with

maximum gap of maximum gap of 1/8”1/8”(General Provisions Standard)( )

Stud

T kTrack

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Floor/Ceiling Joists and Roof RaftersFloor/Ceiling Joists and Roof Raftersgg Same crossSame cross--section elements as studssection elements as studs Webs typically 6” 8” 10” or 12”Webs typically 6” 8” 10” or 12” Webs typically 6 , 8 , 10 , or 12Webs typically 6 , 8 , 10 , or 12

flange

liplipweb

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CC--section floor systemsection floor system

Typical Span Limits: 20 to 25 ft.

Typical Depth Limit: 12 inches

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ColdCold--Formed Steel TrussFormed Steel Truss

Advantages: longer spans (over 60’)Disadvantage: deeper members, bottom chord supported

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ColdCold--Formed Steel TrussFormed Steel Truss

Alternative: Top Chord Supported!

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ColdCold--Rolled ChannelRolled ChannelColdCold Rolled ChannelRolled Channel

used for wall bridgingand fits through web

punch outs in studs and joists

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Screw Attached

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Weld attached.

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Furring (“Hat”) ChannelFurring (“Hat”) Channel

Similar to purlins in metal Similar to purlins in metalbuildings – for sheathing attachment

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Flat StrapsFlat StrapsFlat StrapsFlat Straps

bridgingbridging lateral bracing

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Specialty ConnectorsSpecialty Connectorsused in accordance with manufacturer’s specificationsused in accordance with manufacturer’s specifications

Strap Tie strap Joist hanger Beam Holdownp p ghanger