Structural · S-CH652

Buckling-Restrained Brace Base Plate Connection at Steel Column

Materials

Concrete Steel Masonry / CMU

Elements

Beams Floors / Slabs Foundations / Footings Anchors / Embeds Connections / Plates Reinforcing

Connections

Braced Frame Connection Gusset Plate Base Plate / Anchorage Welded Connection Bolted Connection

About this detail

A structural steel column base plate connection features a buckling-restrained brace framing into a wide flange column. The column bears on a three-inch thick ASTM A572 Grade 50 base plate with a three-inch non-shrink grout pad over a steel grade beam and concrete pile cap. The base plate is secured with at least eight two-and-a-quarter-inch diameter F1554 Grade 105 anchor bolts, extended past the end of the gusset plate as shown, with optional five-eighths by five-inch square washers for oversized holes up to three inches in diameter. A one-inch Grade 50 end plate is welded to the column with seven-sixteenths complete joint penetration welds at the flange, leaving the web unwelded at the column 'K' region. A gusset plate connects the buckling-restrained brace lug to the assembly per the manufacturer's drawings, with full-length welds specified. Partial joint penetration welds are used in lieu of web-to-flange welds for the extent of the base plate, and a concrete slab with an isolation joint occurs around the column base maintaining a three-inch minimum cover.

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