Free RC staircase calculator to SANS 10100
Checks a reinforced concrete waist-slab stair flight, straight or dog-leg, with its landings, and draws the bars in section. Free, no install, 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.
- Straight flights between walls or beams, and dog-leg flights onto landings that span across (SANS 10100-1 cl. 4.9.1)
- Loads on plan from the waist and the steps, effective span and effective width (cl. 4.9.1.2 and 4.9.1.3)
- Bending, minimum and maximum steel, and shear without links (cl. 4.3.3, 4.3.4 and table 23)
- Span/depth with the 15 % increase for stairs without stringers (cl. 4.3.6 and 4.9.2.3)
- Bar spacing, anchorage at the supports, top steel at monolithic ends, and the landings spanning across designed as one-way slabs
- Durability cover for the exposure, fire resistance (table 45), a section drawing and a bar list
Codes: SANS 10100-1 (cl. 4.9 staircases) with SANS 10160-1 load factors; or Eurocode 2 (EN 1992-1-1 one-way slab rules, cl. 6.1, 6.2.2, 7.4.2 and 9.3) with EN 1990 load factors
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 RC staircase 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. 4.9 for the stair and its span, cl. 4.3 for bending, shear and span/depth, and cl. 4.11 for the bar detailing.
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