A single plate connection—often called a shear tab—is a simple steel connection where a single flat plate transfers shear forces from a beam web to a column or main girder. The plate is typically shop-welded to the supporting member and field-bolted to the web of the supported beam. Because it takes up very little space, accommodates minor fabrication tolerances, and speeds up field erection, it remains one of the most widely specified connection types in modern structural design.

Designing a single plate connection involves reviewing a handful of essential parts working together:

• Steel Shear Plate: The central plate (typically A36 or A572 Grade 50) sized for height, width, and thickness to resist shear and local bending.
• High-Strength Bolts: A single vertical row (or multiple rows in extended configurations) of ASTM F3125 Grade A325 or A490 bolts connecting the plate to the beam web.
• Fillet Welds: Double fillet welds joining the back of the plate to the supporting column flange, column web, or girder web.
• Beam Web & Member Elements: The receiving steel web, evaluated for bolt bearing, tear-out, and block shear limit states.

Proper proportioning ensures the plate deforms plastically before bolt or weld failure, maintaining simple beam behavior.

Single plate connections are a go-to detail across structural steel construction, especially where fast field assembly is a priority. Common uses include:

• Beam-to-column flange and beam-to-column web framing in commercial office towers.
• Infill secondary floor beam connections in multi-story structures.
• Industrial platform framing and pipe rack structures.
• Renovations and retrofits where simple field bolting minimizes onsite welding.

Using a single plate connection calculator helps verify AISC 360 compliance across all these typical job site scenarios.

AISC 360-16 Design Manual (Chapter 10) defines two primary configurations for single plate connections:

• Conventional Single Plate Connection: Features a short distance from the weld line to the bolt line (distance ‘a’ ≤ 3.5 inches) with 2 to 12 bolts in a single vertical line. Eccentricity on the bolt group is minimal, simplifying calculations.
• Extended Single Plate Connection: Used when the beam must clear column flanges or obstruction zones (distance ‘a’ > 3.5 inches). Requires accounting for flexural yielding, flexural rupture, and lateral-torsional buckling of the plate due to increased moment arm.

Our calculator accounts for both geometry styles to ensure all eccentric force distributions match AISC design provisions.

To run checks with the SkyCiv Single Plate Connection Calculator, enter your geometry and loading parameters into the module:

• Member Details: Select the supported beam and supporting member (column or girder) section sizes.
• Plate Parameters: Set plate height, thickness, edge distances, and steel grade (e.g., A36).
• Bolt Setup: Pick bolt diameter, grade (A325/A490), hole type (standard or short slotted), pitch, and vertical spacing.
• Weld Details: Input fillet weld size and electrode grade (e.g., E70XX).
• Design Forces: Enter factored shear demand (Vu for LRFD or Va for ASD), plus axial forces if applicable.

Hit “Calculate” to review complete design ratios, critical failure modes, and clear pass/fail status updates in real time.

SkyCiv takes the tedious hand math out of single plate connection design. By automating checks for bolt shear, web bearing, block shear, and plate bending, this online tool helps engineers design faster while maintaining full compliance with AISC 360 standards. You get clear math output logs, accurate capacity ratios, and direct integration with full SkyCiv structural workflows—saving time on every connection check.

• Steel Connection Design Calculator
• SkyCiv Connection Design Software