A double angle connection uses two steel L-shapes placed back-to-back on either side of a beam’s web to transfer end reactions—primarily vertical shear—to a column flange, column web, or primary girder. Because the angles sandwich the beam web, bolts running through the web work in double shear, which practically doubles their capacity compared to a single angle detail. These connections behave as simple supports, letting the beam rotate end-to-end without transferring significant bending moments into the supporting members.

Building an effective double angle connection involves several key structural elements depending on whether you choose a bolted or welded setup:

• Angle Legs: Two steel angle sections (typically equal or unequal leg L-shapes) sandwiching the beam web.
• Web Fasteners (Bolts or Welds): Connect the outstanding legs of both angles through the supported beam web.
• Support Fasteners (Bolts or Welds): Secure the remaining angle legs to the supporting column or girder.
• Supported Beam Web: Receives shear transfer and must be checked for local rupture and bearing.
• Support Member Flange/Web: Provides the landing face for the connection attachment.

These parts work in tandem to create a reliable shear transfer path while keeping fabrication straightforward.

Engineers specify double angle connections across all types of structural steel frameworks, especially where high shear demand requires the extra strength of double-shear fasteners:

• Secondary floor beam to primary girder framing.
• Beam-to-column web and flange shear connections in multi-story steel frames.
• Heavy industrial plants and equipment support platforms.
• Pedestrian bridges, roof trusses, and framed structural openings.

Using a dedicated double angle connection calculator speeds up checks for these details while making sure every check meets AISC 360 requirements.

Depending on shop preferences and field erection requirements, double angle connections can be specified in a few common configurations:

• Bolted-Bolted: Angles are shop-bolted or field-bolted to both the beam web and the supporting member for easy field assembly.
• Welded-Bolted: Angles are shop-welded to the beam web and field-bolted to the supporting column or girder.
• Bolted-Welded: Angles are shop-bolted to the beam web and field-welded to the supporting structure.
• Welded-Welded: All leg connections are fully welded, often used in specialized heavy-duty or shop-fabricated frames.

Each arrangement brings its own balance of fabrication cost and field erection speed.

Using the SkyCiv Double Angle Connection Calculator takes just a few steps:

• Select Section Sizes: Pick your supported beam and supporting member profiles from standard AISC databases.
• Define Angle Geometry: Specify angle profile dimensions, thickness, length, and leg orientation.
• Configure Fasteners: Input bolt grade, diameter, spacing, edge distances, or weld size/length for both sides of the connection.
• Enter Design Forces: Input factored vertical shear force (and axial load, if applicable) under LRFD or ASD.

Click “Calculate” to generate clear utility ratios and failure mode checks instantly, giving you full confidence in your connection layout.

SkyCiv eliminates tedious manual connection checks by automating complex AISC 360 limit state equations in a single, intuitive interface. You get real-time visual feedback, step-by-step reporting, and clear governing utility ratios so you can optimize angle sizes and bolt layouts quickly. Whether you are finalizing construction drawings or verifying framing details in the field, SkyCiv helps you deliver safe, cost-effective connection designs without the hassle.

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• SkyCiv Connection Design Software