An end plate connection is a common steel detailing setup where a flat plate is shop-welded perpendicular to the end of a beam web (and flanged, if rigid) and then field-bolted to a supporting column or beam. Depending on whether the plate extends past the beam flanges, it can function either as a flexible shear connection or a rigid moment connection. Because the welding happens in the shop under controlled conditions, field assembly goes fast and relies primarily on straightforward bolting.

Building an end plate connection requires a few key steel components designed to carry tensile, shear, and flexural stresses:

• Steel End Plate: A rectangular plate welded to the end of the supported beam, sized to accommodate the bolt pattern and load demands.
• Shop Welds: Fillet or complete-joint-penetration (CJP) welds securing the plate to the beam web and flanges.
• Field Bolts: High-strength bolts (such as ASTM A325 or A490) that tie the plate directly to the supporting member.
• Supporting Member: The column flange, column web, or primary girder receiving the bolted plate.
• Stiffener Plates (Optional): Added to the column web or extended plate to prevent localized buckling under heavy moment forces.

Together, these components create a clean load path from the supported beam into the structural framing.

End plate connections are widely specified across structural engineering projects because they assemble quickly on site and deliver dependable strength. Typical uses include:

• Beam-to-column moment frames in multi-story steel buildings.
• Roof portal frames in industrial warehouses and clear-span structures.
• Primary beam-to-girder shear connections in commercial floor systems.
• Pipe racks and heavy support structures in industrial plants.

Using an end plate connection calculator helps engineers quickly verify prying action, bolt shear, and plate yield limits across all these framing conditions.

Engineers select specific end plate configurations based on whether the connection needs to transfer shear alone or combined shear and bending moments:

• Flexible (Partial-Depth) End Plate: Welded only to the beam web to transfer shear while allowing rotation, acting as a simple support.
• Flush End Plate: The plate matches the overall depth of the beam, offering moderate moment resistance alongside shear capacity.
• Extended Unstiffened End Plate: Extends beyond one or both beam flanges to fit additional bolt rows for higher moment resistance.
• Extended Stiffened End Plate: Features vertical stiffener ribs above or below the flanges to increase plate rigidity and prevent prying forces.

Each style has distinct design checks under AISC guidelines, all of which can be modeled inside the online calculator.

Getting accurate calculation checks for your end plate connection takes just a few steps:

• Select Plate Type: Choose between flexible shear, flush moment, or extended end plate options.
• Define Plate & Member Geometry: Enter plate thickness, width, height, and section sizes for the beam and supporting member.
• Specify Fasteners & Welds: Select bolt grade, diameter, pitch, edge distances, and weld sizes.
• Apply Design Actions: Input your factored shear forces ($V_u$), axial forces ($P_u$), and bending moments ($M_u$).

Hit “Calculate” to review real-time design capacities, governing failure modes, and clear ASD/LRFD utility ratios to refine your connection details.

SkyCiv takes the stress out of connection design by combining rigorous code compliance with a clean, web-based interface. Instead of juggling spreadsheets or performing tedious hand checks for prying action, you get instant feedback against AISC 360 standards. The calculator provides complete transparency with full calculation breakdowns and 3D graphics, helping you spot overstressed components early and produce safer, more economical steel structures.

• Steel Connection Design Calculator
• SkyCiv Connection Design Software