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Mechanical reinforcement ratio depends on total area of longitudinal reinforcement. For design of reinforcement, total area of reinforcement is calculated from estimation ratio loaded from Concrete setting (if concrete member data is not defined ) or concrete member data, see "Concrete settings (structure)". The mechanical reinforcement ratio is the same at whole length of the column and it is calculated according to formula
ω = μs ∙ fyd / fcd
where
| μs | estimation ratio of longitudinal reinforcement loaded from Concrete setting (if concrete member data is not defined) or concrete member data |
| fyd | design yield strength of reinforcement. The quality of reinforcement can be input in Project data (if concrete member data is not defined) or in concrete member data |
| fcd | design value of concrete compressive strength |
The coefficient B is than calculated according to formula
B = √(1 + 2 ∙ ω)