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Relative normal force is calculated according to formula
n = NEd / Ac ∙ fcd
where
| NEd | the design value of the applied axial force in compression |
| Ac | the cross-sectional area of concrete |
| fcd |
the design value of concrete compressive strength |
If normal force is not uniform along the length of column or the part of the column (for arbitrary member and member with haunch), the maximum value of normal force at length of column or the part of the column will be taken into account.