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Building Design and Construction Handbook - Merritt - Ventech!

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SECTION EIGHT<br />

COLD-FORMED STEEL<br />

CONSTRUCTION<br />

Don S. Wolford<br />

Consulting Engineer<br />

Middletown, Ohio<br />

Wei-Wen Yu<br />

University of Missouri–Rolla<br />

Rolla, Missouri<br />

The term cold-formed steel construction, as used in this section, refers to structural<br />

components that are made of flat-rolled steel. This section deals with fabricated<br />

components made from basic forms of steel, such as bars, plates, sheet, <strong>and</strong> strip.<br />

COLD-FORMED SHAPES<br />

Cold-formed shapes usually imply relatively small, thin sections made by bending<br />

sheet or strip steel in roll-forming machines, press brakes, or bending brakes. Because<br />

of the relative ease <strong>and</strong> simplicity of the bending operation <strong>and</strong> the comparatively<br />

low cost of forming rolls <strong>and</strong> dies, the cold-forming process lends itself<br />

well to the manufacture of unique shapes for special purposes <strong>and</strong> makes it possible<br />

to use thin material shaped for maximum stiffness.<br />

The use of cold-formed shapes for ornamental <strong>and</strong> other non-load-carrying purposes<br />

is commonplace. Door <strong>and</strong> window frames, metal-partition work, non-loadbearing<br />

studs, facing, <strong>and</strong> all kinds of ornamental sheet-metal work employ such<br />

shapes. The following deals with cold-formed shapes used for structural purposes<br />

in the framing of buildings.<br />

There is no st<strong>and</strong>ard series of cold-formed structural sections, such as those for<br />

hot-rolled shapes, yet although groups of such sections have been designed (‘‘Coldformed<br />

Steel <strong>Design</strong> Manual,’’ American Iron <strong>and</strong> Steel Institute, 1101 17th St.,<br />

NW, Washington, DC 20036). For the most part, however, cold-formed structural<br />

shapes are designed to serve a particular purpose. The general approach of the<br />

designer is therefore similar to that involved in the design of built-up structural<br />

sections.<br />

8.1

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