Fin-Plate (Shear) Connection Calculator

Bolted fin-plate shear connection — a plate welded to the support (column flange/web or beam) and bolted to the supported beam web, to EN 1993-1-8 §3 with SCI simple-connection limit states. Enter the supported beam, fin plate, bolt group and weld for a live connection elevation and eccentric bolt-group resultant diagram, the plate shear/bending/block-tearing and beam-web checks, the double-fillet weld, full design verdict and a printable step-by-step calc sheet.

Runs the validated STATIX connection engine — eccentric bolt group & block tearing verified against EN 1993-1-8 / SCI P358 worked examples

Inputs

Connection

Name / mark

Design code

Bolted fin-plate shear connection — plate welded to the support, bolted to the supported beam web. Eccentric elastic-vector bolt group (M = V·e) with SCI P358 plate / beam-web limit states.

Supported beam & steel

Beam (UB)

Steel grade f_y

MPa

Fin plate

Depth h_p

Thickness t_p

Projection l_p

Gap to support g

Bolts (single vertical line, opt. 2 columns)

Size

Grade

Rows n₁

Columns lines

Pitch p₁

Gauge p₃

End dist e₁

Edge to beam end e_2b

Weld & loads (ULS)

Fillet leg s (×2)

Shear V_Ed

Axial tie N_Ed

Connection elevation

Eccentric bolt-group resultant (V·e)

Design result

—

enter loading

Eccentricity e (face→group)	—
Bolt-group Σr²	—
Max bolt resultant F_b,Ed	—
Bolt resistance F_b,Rd	—
Governing V_Rd	—
Plate shear V_pl,Rd	—
Weld V_w,Rd	—
Governing component	—

Detail

Design checks

Step-by-step calculation

Connection take-off — all fin plates

Every fin plate in the project, aggregated into a connection take-off — fin plate (depth×proj×t_p), bolts (n × size × grade) and double-fillet weld per element with estimated steel mass. Use “Add fin plate” above to build the schedule, then Download PDF (print → Save as PDF). Masses are nominal for take-off only.

This isn't a toy calculator

It runs the same connection engine as STATIX — a full structural suite whose eccentric bolt group, block tearing and weld checks are validated against EN 1993-1-8 and SCI P358 worked examples. The full 3D modeller with native CBFEM is coming soon. Model the whole building and its connections, not just one fin plate.

Get early access →