Base Plate Connection Module

Enter the column dimensions, axial load, concrete strength, and your proposed base plate and anchor bolt details, to check bearing pressure, plate thickness, and bolt shear against Eurocode 3.

Standards used on this page

  • BS EN 1993-1-8:2005+A1:2014 (Eurocode 3, Part 1-8: Design of joints) — §6.2.5 design bearing strength, §6.2.8.2 effective area method, Table 3.4 bolt shear resistance
  • BS EN 1992-1-1:2004 (Eurocode 2) §3.1.6 — concrete design strength
  • UK National Annexes to both codes
Scope of this tool — please read before relying on this result:
  • The concrete concentration factor is fixed at a conservative default (kj = 1.0) — real capacity may be higher if your concrete pad is significantly larger than the base plate.
  • If the load eccentricity exceeds the plate's "kern" (L/6), this tool will flag it and stop — that case needs anchor bolt tension design (a cracked-section analysis), which is not yet implemented. Consult a structural engineer for that case.
  • Bolt tension from uplift is NOT checked — only bolt shear is checked here.
Note on accuracy: as with the other modules, this tool assumes sharp (unfilleted) corners for the column profile, which slightly overstates its perimeter and area compared to a catalogued section (typically 1-2% difference).
Column
mm
mm
mm
mm
Loading
kN
kNm
Concrete and plate
mm
mm
mm
Anchor bolts
property class 8.8
kN
Disclaimer: This tool provides preliminary, indicative structural checks only. It is not a substitute for verification by a qualified structural engineer. cad-steel.co.uk accepts no liability for designs based solely on these results. Always have final designs checked and signed off by a suitably qualified and experienced structural engineer before construction.