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 h_r, compression transfers through the haunch bottom flange (the new centre of compression), and M_j,Rd = Σ F_tr,Rd·h_r 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, M_j,Rd, V_j,Rd, full checks and a printable calc sheet.

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

Inputs

Connection

Name / mark

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). γ_M0=1.0, γ_M2=1.25.

Members

Rafter UB

Column UC

Steel grade f_y

Eaves haunch

Depth h_h below rafter

Length L_h

Cut from

Flange thk t_fh

End-plate

Type

Width b_p

Depth h_p

Thickness t_p

Bolts

Size

Grade

Tension rows

Row pitch p

Gauge g

Welds

Flange leg a_f

Web leg a_w

Applied actions (ULS)

Moment M eaves

kNm

Shear V

Axial N

Eaves elevation — column · rafter · haunch

Bolt-row tension distribution over the deepened connection

Design result

—

enter loading

Moment resistance M_j,Rd	—
vs un-haunched · lever gain	—
Connection depth (rafter + haunch)	—
Shear resistance V_j,Rd	—
Compression resist. F_c,Rd (haunch flange)	—
Web panel shear V_wp,Rd	—
Top-row tension F_t1,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.

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 M_j,Rd, column-web and eaves-haunch worked examples. The full 3D modeller with native CBFEM is coming soon. Model the whole portal frame and every eaves and apex haunch, not just one joint.

Get early access →