The Constructor

Composite Steel Joists

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Composite Steel Joists

Composite steel construction has been recognized for a number of years as one of the most economical systems for constructing building floors. Three options have evolved over the years to meet the requirements for building height limitations and the need to run complex heating, ventilating, electrical, and communication systems: (1) Composite wide flange beams with web openings; (2) Stub girders; and (3) Open web steel joists and joist girders. The term composite joist refers to an open web, parallel chord, load carrying member suitable for the direct support of floors in buildings, utilizing hot-rolled or cold-formed steel, including cold-formed steel whose yield strength has been attained by cold working. Shear connection between the joist top chord and overlying concrete slab allows the steel joist and concrete to act together as an integral unit after the concrete has adequately cured. Currently the most commonly used forms of shear connection between the joist top chord and concrete slab include specially rolled cold formed steel "s" shaped top chords (Hambro), specially embossed back-to-back double angle top chords (Vescom), perforated structural tee top chords (Taftrus), and shear studs welded through the metal deck (Canam, SMI, and Vulcraft). Fig.1:HVAC ducts and pipes passing through joist open webs.

Advantages of Steel Composite Joists

Benefits to be gained by using composite steel joists include the following:
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