Free punching shear calculator to SANS 10100
Checks punching shear in a flat slab at a column, and sizes the shear reinforcement when it is needed. Free, runs in your browser, and prints a calc sheet with clause references.
No install, no card. The result shows without an account; a free account opens every check with its clause, the calc sheet and the bending schedule for 3 designs a month (one calculator, 24 hours). Calculator packs, coming soon, remove the limit.
What the calculator checks.
Every check is shown with the working, the clause and a pass or fail.
- Effective depth from the two-layer mat and the flexural steel ratio
- Concrete shear resistance vc (SANS 10100-1 cl. 4.3.4) and vmax (cl. 4.4.5.2.2)
- Column-face check, the first control perimeter at 1.5d, then perimeters at 0.75d steps until v ≤ vc
- Shear reinforcement for each failing perimeter and a leg layout (BS 8110-1 cl. 3.7.7.5 and 3.7.7.6)
- Interior, edge and corner columns, rectangular or circular, with or without a drop panel
Codes: SANS 10100-1, BS 8110, Eurocode 2 (EN 1992-1-1)
A tool to check a design, not a design approval. Check the results and have the design signed by a registered professional engineer.
Short answers.
About this free calculator.
Is the punching shear calculator free?
Yes. It is free to use: enter your own values and every check shows on the page with its result.
Do I need an account?
No account is needed to use it: every check shows on the page with its result and clause, with a calc sheet summary. Without an account you see the result. A free STATIX account (email or Google, no card) opens every check with its clause, the full calc sheet to print or save as a PDF and the SANS 282 bending schedule for 3 designs a month (one calculator, open for 24 hours). Paid plans, coming soon, will make them unlimited.
Which code clauses does it use?
The calc sheet names the clause on every step: SANS 10100-1 cl. 4.3.4 for vc, cl. 4.4.5 for the control perimeters, and BS 8110-1 cl. 3.7.7 for the column face and shear reinforcement. Choose BS 8110 or Eurocode 2 and the sheet follows that code.
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