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The position of reinforcement is calculated from parameters which are defined in Reinforcement design > Design defaults, see "Design Defaults" . The position of reinforcement is always in the middle of the edge, which is created by offset of current cross-section in distance as. This distance and diameter of reinforcement can be different for each edges and it is calculated in dependence on type of member according to formulas:
as,lj = cnom,l + dss + 0,5 ∙ ds,l + (smin + ds,l) ∙ (j - 1)
as,uj = cnom,u + dss + 0,5 ∙ ds,u + (smin + ds,u) ∙ (j - 1)
as,sj = cnom,s + dss + 0,5 ∙ ds,s + (smin + ds,s) ∙ (j - 1)
as,lj = cnom,l + 0,5 ∙ ds,l + (smin + ds,l) ∙ (j - 1)
as,uj = cnom,u + 0,5 ∙ ds,u + (smin + ds,u) ∙ (j - 1)
as = cnom + dss + 0,5 ∙ ds
where
| cnom,l | is concrete cover at lower surface for beam or beam as slab |
| cnom,u | is concrete cover at upper surface for beam or beam as slab |
| cnom,s | is concrete cover for side reinforcement for beams(for edge which are not at lower or upper surface). This value depends on parameter Type of cover of side reinforcement, see "Design Defaults" |
| cnom | is concrete cover for columns, the value is same for all edges |
| dss | is diameter of stirrups for beam or column |
| ds,l | is diameter of longitudinal reinforcement at lower surface for beam or beam as slab |
| ds,u | is diameter of longitudinal reinforcement at upper surface for beam or beam as slab |
| ds,s | is diameter of longitudinal reinforcement for side reinforcement for beams. his value is same as diameter of longitudinal reinforcement at lower surface |
| ds | is diameter of longitudinal reinforcement for columns, the value is same for all edges |
| j | layer of reinforcement |
| smin | is minimal surface-to-surface distance of reinforcement between two layers |
The edge, for which parameter of upper reinforcement is used, is the edge above axis which is crossed by line in direction of bending moment resultant for dangerous combination, which causes the biggest linear stress in the cross-section
The edge, for which parameter of lower reinforcement is used, is the edge under axis which is crossed by line in direction of bending moment resultant for dangerous combination, which causes the biggest linear stress in the cross-section