Free calculatorsFlat Slab Punching Shear Calculator
Multi-code flat-slab punching-shear design — SANS 10100, BS 8110 and Eurocode 2 cl.6.4. Interior, edge and corner columns, rectangular or circular, under a column reaction and optional unbalanced moment: control-perimeter diagram, β load-eccentricity factor, column-face crushing, successive control perimeters, optional drop panel / column head, shear link or stud design with a layout suggestion and a printable clause-by-clause calc sheet.
SANS/BS perimeters at 1.5d per BS 8110 cl.3.7.7 with the validated STATIX vc; Eurocode 2 per EN 1992-1-1 cl.6.4
Inputs
Design code
Column
mm
Slab
mm
mm
mm
mm
Drop panel / column head (optional)
Loading (ULS)
kN
kNm
Materials
MPa
MPa
Control perimeters — plan
Section through slab
Design result
—
—
enter loading
| Effective depth d | — |
| Flexural ratio ρl | — |
| β eccentricity factor | — |
| Face: v0 / vmax | — |
| Control perimeter u1 | — |
| v / vc at u1 | — |
| Shear reinforcement | — |
| Layout suggestion | — |
Failure cone
Design checks
Step-by-step calculation
221
This isn't a toy calculator
It runs the same engine philosophy as STATIX — a full structural suite validated against 221 closed-form and code benchmarks across analysis, design and connections — the full 3D modeller with native CBFEM is coming soon. Check every column head straight off the FE slab, not one at a time.