Structural · S-RZFQC

Bottom Flange Lateral Brace Detail

Materials

Concrete Steel

Elements

Beams Decks Bracing Connections / Plates

Connections

Gusset Plate Bracing Connection Bolted Connection

About this detail

A lateral bottom flange brace connection between wide-flange beams supports a concrete-filled steel deck. The assembly incorporates angle braces tied into gusset plates, connected using two 7/8-inch diameter A325 bolts at each end or alternatively an 8-inch total minimum weld along three sides at the contractor's option. A 3/8-inch full-depth stiffener is provided at the deck when no fill is present, along with an L4x4x3/8 angle. Additional connection elements include a 1/2-inch plate, a 3/8-inch plate, and two studs typically added at brace angles in adjacent deck flutes or at 4 inches on center. Notes specify criteria for gusset plate thickness based on clear distance Le, along with schedules defining specific brace sizes for various wide-flange beam weight ranges under both concrete deck and steel deck conditions.

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