Strip footing design under a wall (BAEL 91)
Design a strip footing under a wall to BAEL 91: width, effective depth, soil pressure and transverse reinforcement per metre. Step-by-step worked example.
What the sheet calculates
- Width B iterated until the soil pressure is acceptable
- Effective depth of the footing
- Actual soil pressure
- Transverse reinforcement per linear metre (strut-and-tie method)
- Anchorage length and end hooks where needed
- Concrete and steel quantities
Worked example
Calculated by the BÉTONIQ PRO engine with the inputs below. It is the same working as in the software and in the Word calculation report.
The calculation output is in French, as in the software.
Inputs
- Charge ultime par mètre linéaireNu
- 0.25 MN/ml
- Charge de service par mètre linéaireNser
- 0.18 MN/ml
- Épaisseur du mur
- 0.2 m
- Contrainte admissible du solσSol
- 0.15 MPa
Détail du calcul · BAEL
Conforme| N° | Étape | Valeur | Unité |
|---|---|---|---|
| 1 | Largeur B (itérée sur le sol) | 1,85 | m |
| 2 | Hauteur utile d | 0,413 | m |
| 3 | Contrainte sol q' | 0,1476 | MPa |
| 4 | Acier transversal (bielles), σs=435 MPa | 2,88 | cm²/ml |
| 5 | Longueur de scellement ls (nappe transversale) | 0,441 | m |
Hypothèses
- fc28
- 25 MPa
- fe
- 500 MPa
- σSol
- 0,15 MPa
Géométrie
- B
- 1,85 m
- Ht
- 0,5 m
- d
- 0,413 m
Sol
- q réel
- 0,1476 MPa
- qAdm
- 0,15 MPa
- Vérifié
- vérifié
Aciers
- TransversalAs
- 2,88 cm²/ml
- Transversal › Choix
- 4HA10/ml
- RépartitionAs
- 2,96 cm²/ml
- Répartition › Choix
- 4HA10
- Répartition › Diamètre
- 10 mm
- Répartitionn
- 4
Ancrage
- ls
- 0,441 m
- Barres droites
- vérifié
Métré
- Acier
- 7 kg/ml
- Volume de béton
- 0,925 m³/ml
Avertissement : Prédimensionnement indicatif, à valider par un bureau d’études agréé.
Other common calculations
- Pad footing design under a column (BAEL 91)
- Column pre-sizing from tributary area
- Reinforced concrete beam design (BAEL 91)
- Solid slab spanning between two supports (BAEL 91)
- Straight reinforced concrete staircase design (BAEL 91)
- Reinforced concrete retaining wall stability
- Load takedown on a column
- Rebar anchorage length (Eurocode 2)
- Footing bearing capacity from pressuremeter tests (Fascicule 62)