Structural · S-M49QP

Moment Frame Beam to Column Ordinary Moment Frame Connection

Materials

Steel

Elements

Columns Beams Bracing Connections / Plates Roof / Floor Openings

Connections

Shear Tab / Single Plate Welded Connection Bolted Connection

About this detail

An ordinary moment frame beam-to-column connection utilizes a moment frame column and moment frame beam sized per plan. The connection incorporates a cap plate welded to the column flanges with a complete-joint-penetration weld, along with three-eighths-inch thick doubler plates and continuity plates attached via complete-joint-penetration groove welds. Three-eighths-inch thick stiffener plates are provided on each side for bracing, secured with three-quarter-inch diameter plug welds typically. The beam connects to the column through complete-joint-penetration groove welds at the top and bottom flanges designated as demand-critical welds per AISC 341-05, complete with specified weld backing removal, backgouging, and five-sixteenths-inch fillet welds. A shear tab matches the beam web thickness with a minimum of three-eighths-inch, overlapping the weld access hole by one-quarter to one-half inch and extending two inches back along the beam. The shear tab is welded to the column flange with a full-depth partial penetration weld from the far side and fillet welded to the beam web with a size equal to the shear tab thickness minus one-sixteenth-inch. Erection bolts facilitate field assembly.

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