Structural · S-4CZY9

Braced Frame Base Connection

Materials

Elements

Floors / Slabs Foundations / Footings Bracing Anchors / Embeds Connections / Plates

Connections

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

About this detail

A heavy steel braced frame column base connection anchors to a reinforced concrete footing. A hollow structural section column per plan bears on a two-and-a-half-inch thick A572 Grade 50 base plate secured by eight one-and-a-half-inch diameter F1554 Grade 55 anchor bolts with heavy hex nuts for bearing. Leveling nuts are omitted at these base plate types, utilizing shim plates typically. The top twelve inches of each anchor bolt are wrapped with electrical tape to prevent bond with the surrounding concrete. A one-inch Grade 50 gusset plate connects a core brace to the assembly using demand-critical complete joint penetration welds at each flange, with specific angles detailed for the connection. Beneath the base plate, an HSS12x12x3/4 Grade 50 shear key is housed within a sixteen-by-sixteen-inch blockout, extending to a shear key depth of one foot three inches. The concrete footing is reinforced with twelve number five bars each way, centered with the base plate, and sits below a slab on grade with a two-inch non-shrink grout layer beneath the base plate.

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