Structural · S-QHAJD

Steel Beam to Column Moment Connection Root Opening Detail

Materials

Steel

Elements

Beams Floors / Slabs Connections / Plates Roof / Floor Openings

Connections

Welded Connection Bolted Connection

About this detail

A steel beam frames into a column with a moment connection utilizing complete joint penetration welds at the top and bottom flanges. A maximum three-eighths inch root opening is specified at the flanges per AWS standards. The web connection uses connection type 'BA' with ASTM A490 slip-critical bolts unless noted otherwise, maintaining a maximum half-inch clearance at the web. A one-half inch web doubler plate is provided at the column web alongside a continuous plate whose thickness is calculated as zero-point-six times the plate thickness. The backup bar at the column flange is specified to be removed, back-gouged, and finished with a fillet weld.

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