Structural · S-3W6NA

Grouped Openings

Materials

Concrete Composite

Elements

Floors / Slabs Decks Reinforcing Roof / Floor Openings

Connections

Shear Stud / Composite

About this detail

This structural detail provides reinforcing requirements, spacing limits, and dimensioning criteria for grouped and small slab penetrations in a composite concrete deck. Openings under six inches in diameter require no reinforcement when spaced greater than four times the largest hole diameter apart, while closer spacings or grouped openings up to two feet in combined width require specific reinforcing bars per the single opening detail or structural framing. One number four bar is placed perpendicular to the deck flute one inch clear above the deck, paired with one number four bottom bar parallel to the deck spanning at least two feet on each side of the opening. Blockout openings must be formed before placing concrete and cut only after the concrete reaches its design strength.

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