RC Pile Cap Design Calculator
Multi-code reinforced-concrete pile cap design — SANS 10100, BS 8110 and Eurocode 2. For 2, 3 and 4-pile caps under a column axial load and optional biaxial moment: rigid-cap pile reactions, main tension reinforcement by the truss / strut-and-tie method banded over the pile heads, a simple-bending cross-check, column and corner-pile punching, beam (face) shear with the enhanced-shear-near-supports allowance, minimum steel, bar anchorage past the pile centre and a printable clause-by-clause calc sheet.
Truss method to BS 8110 cl.3.11.4 with SANS 10100 materials; Eurocode 2 strut-and-tie per EN 1992-1-1 cl.6.5 & 9.8.1
Inputs
Pile cap
Design code
Column load (ULS design values)
kN
kNm
kNm
SLS pile-check loads optional — 0 = not given, ULS used conservatively
kN
kNm
kNm
Pile arrangement
mm
mm
mm
kN
kN
Cap & column geometry
mm
mm
mm
Materials
MPa
MPa
kN/m³
Shear (uncertainty inputs — cited defaults)
φ
Anchorage & practice
φ
mm
Pile cap plan
Section / elevation
Strut-and-tie model truss method
Design result
—
—
enter loading
| Cap plan (b × L × h) | — |
| Pile reaction max / min | — |
| Effective depth d | — |
| Tie force / band T | — |
| Tie steel per band | — |
| Bending cross-check As | — |
| Beam shear v / vallow | — |
| Col-face punch v0 / vmax | — |
| Anchorage lb / avail | — |
Tie band
Design checks
Step-by-step calculation
Combined bar schedule — all pile caps
Every pile cap in the project, aggregated — banded tie bars each way over the pile heads. Marks are prefixed with each cap name. Use “Add pile cap” above to build the full schedule, then Download PDF (print → Save as PDF). Cut lengths per SANS 282:2004 (nominal; bobs/hooks and laps to the detailer where anchorage is short).
This isn't a toy calculator
It runs the same engine philosophy as STATIX — a full structural suite built on the same engine. Model the whole substructure, not just one cap.