Raft Foundation Calculator
A rectangular RC raft on Winkler soil springs: SANS 10100-1, BS 8110-1, Eurocode 2 or SANS 51992-1-1. Columns, walls and floor loads in; soil pressure, settlement, the four mats, punching at every column and a bending schedule out.
SANS 10100-1 cl.4.4 slabs, cl.4.6 punching · EN 1992-1-1 6.1, 6.4, 9.3 · SANS 10160-1 loads · plate on Winkler springs
See a worked example →
Raft
m
m
mm
Soil
kN/m³
kPa
Loads characteristic
kPa
Materials
MPa
MPa
Durability
mm
Walls on the raft
Model and schedule
m
kN/m³
mm
Plan: soil pressure (SLS) and columns
soil pressure 0 to qa and overcolumn (colour = punching use)wall
Design checks
| Check | Clause | Demand / capacity | Utilisation | Result | |
|---|---|---|---|---|---|
| Checking on the STATIX server… | |||||
Check details as text
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enter the footing
Design result
| Soil pressure qmax / qa | — |
| Settlement largest / smallest | — |
| Bottom mat x / y | — |
| Top mat x / y | — |
| Punching: the most used column | — |
| Model | — |
Bending schedule
Built on the STATIX server.
Bending schedule (SANS 282)
Loading… Sign in (free) to get the bending schedule: 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 raft here, the whole building in STATIX
On the STATIX project board the columns bring their loads down to the raft. This calculator is free today.