Calculations › Strip Foundation
Strip Foundation
EN 1997-1
Checks a strip foundation for bearing pressure and sliding to EN 1997-1.
Diagram
Example inputs
Strip width B600 mm
Foundation depth D500 mm
Wall load — ULS (wEd)80 kN/m
Wall load — characteristic55 kN/m
Allowable bearing (qa)150 kN/m²
Concrete gradeC25/30
National annexUK
Results
Strip Foundation — 600mm wide
C25/30 · depth 500mm · qa=150 kN/m² · EN 1997-1
Results
✓ Bearing PASS
util 0.69104.17EN 1997-1 §6.5
| Strip width B | 0.6 | m | |
| Self-weight = B × D × γc | 7.5 | kN/m | |
| Total characteristic load = Fchar + Wsw | 62.5 | kN/m | |
| σ gross bearing pressure = N_total / B | 104.17 | kN/m² | EN 1997-1 §6.5 |
| qa allowable bearing | 150 | kN/m² |
✓ Base Bending PASS
util 0.012.41EN 1992-1-1 §6.1
| Cantilever length lc = (B − wall) / 2 | 192.5 | mm | |
| pULS upward pressure (ULS) = wEd / B | 0.13 | N/mm² | |
| d effective depth = D − cover − φ/2 | 442 | mm | |
| mEd base moment = pULS × lc² / 2 | 2.41 | kNm/m | EN 1992-1-1 §6.1 |
| K bending parameter = mEd / (fcd × b × d²) | 0.001 | — | |
| z lever arm = d[0.5 + √(0.25 − K/1.134)] | 419.9 | mm | |
| As,req reinforcement = mEd / (fyd × z) | 13.2 | mm²/m | EN 1992-1-1 §6.1 |
✓ Min. Depth PASS
util 1.00500.00EN 1997-1 §6.4
| Foundation depth D | 500 | mm | |
| Minimum depth requirement | 500 | mm | EN 1997-1 §6.4 |
Try it yourself
Run this calc with your own inputs