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This method allows to design reinforcement for normal force (NEd) and biaxial bending moments. This method is based on interaction formula, equation 5.39 in EN 1992-1-1.
(MEdy / MRdy)2 + (MEdz / MRdz)2 ≤ 1
where
| MEdy | is design moment around y axis | ||||||||
| MEdz | is design moment around z axis | ||||||||
| MRdy | is the design moment resistance around y-axis, it means intersection of interaction diagram and line parallel with My axis across the point with coordinates [NEd, MEdy, 0], see "Theoretical background" | ||||||||
| MRdy | is the design moment resistance around y-axis, it means intersection of interaction diagram and line parallel with Mz axis across the point with coordinates [NEd, 0, MEdz], see "Theoretical background" | ||||||||
| a |
is exponent of interaction formula
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| NEd | is design axial force | ||||||||
| NRd |
is design axial resistance NRd = Ac ∙ (fcd + μs ∙ fyd) |
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| Ac | cross-sectional area of concrete cross-section | ||||||||
| μs | estimation ratio of longitudinal reinforcement loaded from Concrete setting (if concrete member data is not defined ) or concrete member data, see "Estimation of ratio of longitudinal reinforcement" | ||||||||
| fcd | design value of concrete compressive strength | ||||||||
| 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 |
The results of biaxial method depends on type of member: