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Column Base Plate

Two checks decide a base plate. Concrete bearing sets the plan size — the plate must spread the column load until the concrete beneath can take it. Cantilever bending of the plate overhang then sets the thickness, using whichever overhang is larger.

Column load Pu (kN)

Concrete f'c (MPa)

Plate length N (mm)

Plate width B (mm)

Column depth d (mm)

Column flange width bf (mm)

Plate yield Fy (MPa)

Area required (bearing)

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Area provided

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Bearing stress

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Bearing capacity

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Governing cantilever

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Required thickness

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Concentric axial load only — no moment, no shear transfer, no anchor rod design or embedment, and no confinement benefit from a footing larger than the plate. A base plate carrying moment is a different and considerably harder problem.

PRELIMINARY SIZING ONLY — not a code-compliant design check. These are first-pass equations; they omit member stability, local buckling, shear and combined-stress interaction, connections, second-order effects and jurisdiction-specific factors. Codes vary by country and edition. Structural design must be performed and sealed by a qualified engineer.