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Haunched End-Plate Connection Calculator — Portal Eaves

Haunched bolted moment end-plate for a portal-frame eaves (knee) — EN 1993-1-8 §6.2 component method. A tapered haunch is welded under the rafter at the eaves: the connection deepens (depth = rafter depth + haunch depth), extra tension bolt rows gain larger lever arms hr, compression transfers through the haunch bottom flange (the new centre of compression), and Mj,Rd = Σ Ftr,Rd·hr rises versus the un-haunched joint. Enter the rafter, column, haunch, end-plate, bolt rows and M/V/N for the live eaves elevation, the bolt-row tension distribution over the deeper connection, haunch-flange compression, Mj,Rd, Vj,Rd, full checks and a printable calc sheet.

Runs the validated STATIX connection engine — verified against EN 1993-1-8 T-stub & end-plate Mj,Rd worked examples and the STATIX eaves-haunch check

Inputs

Connection
Design code
Single-code module — haunched moment end-plate portal-eaves connection by the EN 1993-1-8 §6.2 component method (T-stubs, column web, panel shear, haunch-flange compression). γM0=1.0, γM2=1.25.
Members
Eaves haunch
mm
mm
mm
MPa
EN 1993-1-8 cl.6.2.6.2(2): where the maximum longitudinal compressive stress in the column web — from the column's own axial force and moment — exceeds 0,7 fy,wc, the web-in-compression resistance is reduced by kwc = 1,7 − σcom,Ed/fy,wc. Left at 0 this is taken as kwc = 1,0, which the clause's own NOTE allows for preliminary work — and which then has to be checked once the column stress is known.
End-plate
mm
mm
mm
Bolts
mm
mm
Welds
mm
mm
Applied actions (ULS)
kNm
kN
kN

Eaves elevation — column · rafter · haunch

Bolt-row tension distribution over the deepened connection

Design result

—
—
enter loading
Moment resistance Mj,Rd—
vs un-haunched · lever gain—
Connection depth (rafter + haunch)—
Shear resistance Vj,Rd—
Compression resist. Fc,Rd (haunch flange)—
Web panel shear Vwp,Rd—
Top-row tension Ft1,Rd—
Critical row / lever z1—
Governing component—
Utilisation—
End-plate detail

Design checks

Step-by-step calculation

Connection take-off — all haunched eaves connections

Every haunched eaves connection in the project, aggregated into a fabrication take-off — end-plate, haunch cutting, bolts and welds per element with estimated steel mass. Use “Add connection” above to build the schedule, then Download PDF (print → Save as PDF). Masses are nominal for take-off only.
EN

This isn't a toy calculator

It runs the same component-method engine as STATIX — a full structural suite whose connection module is validated against EN 1993-1-8 T-stub, end-plate Mj,Rd, column-web and eaves-haunch worked examples. A full 3D modeller with native CBFEM is planned. Model the whole portal frame and every eaves and apex haunch, not just one joint.

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