Post-Tensioned Slab Strip Calculator
One design strip of a post-tensioned flat slab with unbonded monostrand tendons: spans, slab, tendons and loads on top, the strip drawn, every check with its clause, the bending and tendon schedule and a step-by-step calc sheet.
SANS 10100-1 section 5 prestressed concrete, ACI 318-19 two-way prestressed slabs
See a worked example →
Spans
mm
Slab
mm
mm
Tendons
/m
Loads
kN/m²
kN/m²
Concrete
MPa
Design code
Cover to the strand
mm
Loading
Materials
%
Columns
mm
mm
MPa
Design basis
Hz
Second direction (across)
Slab strip
Sketch
Design result
| Force per strand P0 / Pi / Pe | — |
| Losses / precompression P/A | — |
| Balanced load (governing span) | — |
| Service stress: tension / compression | — |
| ULS hogging / sagging (M / MR) | — |
| Final deflection (worst span) | — |
| Bonded top bars at the columns | — |
| Punching links (SANS route) | — |
| Floor natural frequency (lowest span) | — |
Bending schedule
Built on the STATIX server.
Design checks
| Check | Clause | Demand / capacity | Utilisation | Result | |
|---|---|---|---|---|---|
| Checking on the STATIX server… | |||||
Check details as text
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enter the strip
Bending and tendon schedule (SANS 282)
Loading… Sign in (free) to get the bending schedule and the tendon profile: 3 designs a month.
Step-by-step calculation
Loading the calc sheet from the STATIX server… Sign in (free) for every check, the calc sheet and the bending schedule: 3 designs a month.
One strip here, the whole floor in STATIX
Post-tensioned slabs in the STATIX 3D suite are in development: tendon layout, losses and the balanced loads in the 3-D model. This calculator is free today.