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Mechanical reinforcement ratio depends on total area of longitudinal reinforcement. For checks total area of reinforcement is calculated from inputted reinforcement via REDES or Free bars. The mechanical reinforcement ratio is calculated according to formula below. The mechanical reinforcement can be different along whole length of the column and in each section of the member and it is calculated according to formula below
ω = ∑(As,i ∙ fyd,i) / (Ac ∙ fcd)
where
| As,i | cross-sectional area of i-th reinforcement in the cross-section of current section inputted via REDES or Free bars |
| fyd,i | design yield strength of i-th reinforcement in the cross-section inputted via REDES or Free bars inputted via REDES or Free bars |
| Ac | cross-sectional area of concrete cross-section |
| fcd | design value of concrete compressive strength |
The coefficient B is than calculated according to formula:
B = √(1 + 2 ∙ ω)