Structural · S-P7BJ2

Typical Moment Connection at Steel Beam to Column

Materials

Steel Metal (misc.)

Elements

Columns Beams Bracing Connections / Plates Roof / Floor Openings

Connections

Moment Connection Braced Frame Connection Shear Tab / Single Plate Beam-to-Column Welded Connection Bolted Connection

About this detail

A rigid moment connection between a steel beam and a braced frame column. The connection features complete joint penetration groove welds at the top and bottom beam flanges, which are designated as demand critical welds with weld access holes cut into the web. For the top flange, the detail permits either a complete joint penetration weld with the weld backing removed, back gouged, and finished with a five-sixteenths inch fillet weld, or leaving the backing in place with the addition of a five-sixteenths inch fillet weld. The bottom flange requires weld backing to be removed, back gouged, and inspected, followed by a five-sixteenths inch fillet weld. Continuity plates matching the beam thickness are welded inside the column flanges directly opposite the beam flanges. A single plate shear tab, sized one-sixteenth inch less than the beam web thickness, is fillet welded to the column and connected to the beam web using three seven-eighths inch diameter erection bolts tightened snug. Construction sequence notes require tightening erection bolts snug first, welding the top and bottom flanges second, and welding the beam web last.

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