Cold-Formed Steel in Construction

COLD--FORMED COLD -FORMED STEEL

Steel The Material

~ Is recyclable, using old cars, buildings,

, , . ~ Steel is the world’s most versatile material to recycle ~ Yearly, steelmakers recycle about million tons of steel stee st eell world worl wo rldd--wid -w wide ide e ~ frame a basic residential dwelling ~ Recognized Green Building Material

The Environment ~ ~ Less than 6% of landfill is steel - such as staples, nails ~ Every ton of steel recycled conserves 2,500 pounds of iron ore, 1400 pounds of coal and 120 pounds of limestone. ~ Debris from a typical woodwood-framed -framed home accounts for o an was e, compare o on y rrom om a steel--framed steel -framed house

Advantages of Steel

~ Consistent Material Quality ~ uper or e sm c er ormance ~ Non Non--Combustible Material ~ Dimensionally Stable in any Climate ~ Insect Resistance

Advantages of Cold Cold--Formed Steel

~ High Strength to Weight Ratio ~ ~ Ease of Fabrication and Mass Production ~ Speed of Erection ~ Flexibility in Design Common Residential Houses (Prescriptive Method, IRC)

What is Light Gauge, or more accura e y, o - orme ee

Cold Formin is a rocess where steel members are manufactured by rolling or shaping the steel after it is cold. This process makes the steel stronger.

y material produced by .

into a shape.

Most Common ~ Surface Surface--Panel Material such as Sidin Roofin Com osite Deck ~ Individual Members used as Purlins, Girts, Studs and Joists

~ Such as Perforated Sections ~ ~ Endless Geometric Possibilities

Common Uses of Cold Cold--Formed 

Non--load bearing interior partition walls Non  

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and seismic out of plane loads only) mm r i l ilin Residential load bearing wall studs  

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Residential Commercial

Single Family Multi--Family Multi

Commercial load bearing wall studs Commercial trusses Commercial roof and floor framing

Practical Uses For Cold Formed ee

Sheathed Floor Systems

Concrete Floor Systems

Roof Systems

Exterior Wall Systems

Residential-- Load Bearing –  Residential – Single Family

Institutional-Load Bearing Institutional-

Commercial Load Bearing

Mid--Rise LoadMid Load-Bearing 

An 88-story gravity system

floor bearing walls l n k  ” m and concrete floor system  Loads uniformly distributed

Non-Load Bearing Nonxter or tu a s Studs are cli ed to the floor and roof levels with vertical slip clips to isolate the wall system from floor level gravity loads to revent crackin the exterior finish system.

Generic ColdCold-Formed Steel

Cold--Formed CCold C-Sha e

600 6” Member Depth in 1/100 inches

S Stud or Joist with Stiffener

162 1-5/8” Flange in 1/100

- 54 Min. base metal thickness in mils (.054 = 54 mils)

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Structural studs 

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Non--structural studs Non

Carry Axial loads

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1-5/8” flanges and 1/2” return . Thickness from 3333-97 mil G60 galvanized coating

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”

”

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Not expected to carry loads 1-1/4” flanges and 1/4” return li s, t ical Thickness often less than 33 mil G40 galvanized coating

web Studs made to fit in tracks Flange: 1-1/4” (Typical)

Floor/Ceilin Joists and Roof Rafters 

Same elements as studs ”, ”, ”, or 12”

flange

web

Cold-Rolled ColdChannel

used for wall bridging and fits through web punch outs in studs and joists

Furring (“Hat”) Channel buildings

r

r g ng

lateral bracing

Specialty Connectors ’ specs.)

e

t

hanger

DESIGN SPECIFICATIONS STANDARDS

AISI S100S100-2007 North American pecification 

es gn pec ca on or o - orme Steel in Construction

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General Information:   

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- : enera rov s ons AISI S201S201-07: Product Standard Code of Standard Practice 2006 Edition

Design Standards:     

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AISI S210S210-07: Floor and Roof System Design AISI S211S211-07: Wall Stud Design AISI S212S212-07: Header Design - : a era es gn AISI S214S214-07: Truss Design AISI S230S230-07: Prescriptive Method for One and Two Family Dwellings

Standard Practice for o - orme Structural Framing