Structural · S-49W3K

Beam to Girder Flange Fill Plate Connection Detail

Materials

Steel

Elements

Beams Connections / Plates Reinforcing

Connections

Welded Connection

About this detail

A fill plate connection is used where a beam flange is thicker than the supporting girder flange. A plate sized to the beam flange width plus four inches matches the beam steel grade and fills the elevation gap. Complete joint penetration welds tie the top and bottom flanges, accompanied by standard weld access holes at top and bottom. A bolted web connection handles shear forces while the fill plate accommodates the thickness transition. All welding conforms to AWS D1.8 standards for seismic force-resisting systems, with bottom flange backing bars removed, backgouged, and reinforced per AISC 358.

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