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Axial resistance of concreted column

The friction between column surface and concrete may be considered in the most of cases. The friction resistance Frd is calculated as the minimum value of failure along the steel surface and the combination of shear failure in concrete and friction on flanges:

The friction resistance of column surface Fs,Rd is given by the expression:

Considered column surface

Combined failure of shear in concrete and friction on flanges Fc,s,Rd is given by the expression

Combined failure of shear in concrete and friction on flanges

Punching without base plate

The punching at the bottom end has to be checked if the friction resistance fails (or if cannot be considered). The punching resistance is based on EN 1992-1-1

Where is:

β

  • The eccentricity factor (β=1,0)

u

  • The critical perimeter of the cross-section

νRd1

  • The design shear resistance of concrete without reinforcement per one linear meter according to EN 1992-1-1

νRd3

  • The design shear resistance of concrete with reinforcement per one linear meter according to EN 1992-1-1

The compressive resistance is calculated as

Where is:

fj

  • The concrete strength in concentrated compression

Ac

  • The cross-sectional area of column

Punching with base plate

The base resistance in punching is calculated in accordance with EN 1992-1-1 as

Where is:

ubp

  • The perimeter of critical cross-section for column with base plate

The compressive resistance is calculated as

Where is:

Aeff

  • The effective area of column calculated in the same way as the effective area of base plate on foundation failure according to EN 1992-1-1

The effective area for column

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