Structural · S-DZ78A

New Concrete Slab Infill at Existing Steel Beam and Slab

Materials

Concrete Reinforced Concrete Steel

Elements

Beams Floors / Slabs Bracing Anchors / Embeds Reinforcing

Connections

Bracing Connection Welded Connection Shear Stud / Composite Rebar Splice / Development Embed Plate

About this detail

A new concrete slab infill is supported by an existing W36x steel beam and tied into an existing concrete slab. The existing concrete surface is roughened to one-quarter-inch amplitude prior to pouring the new slab, which is reinforced per plan. Epoxy dowels tie the new slab edges into the existing concrete at twelve inches on center. The contractor core-drills four-inch-diameter maximum cores down to the existing steel beam top flange, welds three-quarter-inch-diameter by six-inch-long Nelson studs at twelve inches on center, and patches the cores with six-thousand-psi minimum compressive strength concrete prior to pouring the new slab. The existing slab and beam reinforcing must remain undamaged, requiring the contractor to scan with X-ray or other suitable methods prior to coring. A brace connects to the bottom flange of the existing steel beam.

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