Architectural · A-QQ942

Compression Strut and Seismic Bracing at Concrete Structure

Materials

Concrete Steel Metal (misc.)Gypsum / Drywall

Elements

Ceilings Bracing Anchors / Embeds Roof / Floor Openings

Connections

Bracing Connection Embed Plate

About this detail

A suspended ceiling seismic brace anchors to the underside of a concrete structure. Hilti CC27ALH32 shot pins or equivalent secure the assembly with a three-quarter-inch minimum penetration into the concrete, spaced at a maximum of forty-eight inches each way. Splayed seismic brace wires are installed at a forty-five-degree angle with four tight turns at both ends, connected via a steel strap measuring one inch wide by two inches long by twelve gauge minimum. A three-quarter-inch by thirteen-gauge ceiling clip secures the vertical hanger wire with three tight turns at both ends. One in two brace wires requires testing to four hundred forty pounds, and one in ten vertical hanger wires requires a test load of two hundred pounds with a maximum five-eighths-inch embedment. All ceiling hanger wires must be separated by at least six inches from unbraced ducts, pipes, and conduits.

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