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

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.

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.

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

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

ThicknessThicknessThicknessThickness

16 ga

Gage is no longer used as the thickness designator

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

ShapesShapesShapesShapes

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

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.

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”)

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

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

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

CC--section floor systemsection floor system

Typical Span Limits: 20 to 25 ft.

Typical Depth Limit: 12 inches

ColdCold--Formed Steel TrussFormed Steel Truss

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

ColdCold--Formed Steel TrussFormed Steel Truss

Alternative: Top Chord Supported!

ColdCold--Rolled ChannelRolled ChannelColdCold Rolled ChannelRolled Channel

used for wall bridgingand fits through web

punch outs in studs and joists

Screw Attached

Weld attached.

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

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

Flat StrapsFlat StrapsFlat StrapsFlat Straps

bridgingbridging lateral bracing

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

Strap Tie strap Joist hanger Beam Holdownp p ghanger