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Introduction to CJ Series Steel Joists in Floor Systems

Course Information


Composite and noncomposite steel joists are utilized to support concrete floor systems. This article highlights the use of Steel Joist Institute (SJI) CJ-Series composite joists. SJI CJ-Series composite steel joists utilize shear studs welded through the steel deck to the underlying top chord angles of the steel joists (see Figures 1 and 2). Steel joist top chords typically are fabricated utilizing hot-rolled or cold-formed steel angles. A typical 1-inch horizontal gap between the top chord angles requires that the shear studs be welded to the top chord horizontal legs on either side of this gap.

After the concrete is placed on the steel deck and allowed to cure, the concrete slab acts as a compression chord element for the steel joist. Installed welded shear studs transfer the horizontal shear between the concrete slab and steel joist.


David Samuelson, P.E.

Learning Objectives

• What advantages steel joists provide when designing concrete floor systems.

• How one specifies a composite joist and an understanding of a CJ-Series joist designation.

• How one calculates the composite moment capacity for a CJ-Series joist.

• How one can efficiently install welded shear studs through the steel deck to the underlying CJ-Series composite joists.

• How the predicted floor vibration for a joist-supported floor system can be determined utilizing readily available software.

• How SJI’s Floor Bay Tool can readily assist the designer to estimate the cost of a joist-supported floor system.

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