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 |
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u |
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νRd1 |
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νRd3 |
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The compressive resistance is calculated as
Where is: | fj |
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Ac |
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Punching with base plate
The base resistance in punching is calculated in accordance with EN 1992-1-1 as
Where is: | ubp |
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The compressive resistance is calculated as
Where is: | Aeff |
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The effective area for column