Calculateur d'Espacement des Armatures — Formule
## How to Calculate Rebar Spacing
### Formula
**Usable Span = Total Span - 2 × Edge Cover**
**Number of Bars = floor(Usable Span / Spacing) + 1**
**Actual Spacing = Usable Span / (Number of Spaces) × 12**
Edge cover is the minimum distance from the edge of the concrete to the nearest rebar. Typical cover is 3 inches for cast-against-ground concrete and 1.5 inches for formed surfaces.
### Formula
**Usable Span = Total Span - 2 × Edge Cover**
**Number of Bars = floor(Usable Span / Spacing) + 1**
**Actual Spacing = Usable Span / (Number of Spaces) × 12**
Edge cover is the minimum distance from the edge of the concrete to the nearest rebar. Typical cover is 3 inches for cast-against-ground concrete and 1.5 inches for formed surfaces.
Exemple Résolu
Rebar across a 30 ft span at 12-inch spacing with 3-inch edge cover.
- Cover in feet = 3 / 12 = 0.25 ft
- Usable span = 30 - 2 × 0.25 = 29.5 ft
- Spacing in feet = 12 / 12 = 1.0 ft
- Number of bars = floor(29.5 / 1.0) + 1 = 30 bars
- Actual spacing = 29.5 / 29 × 12 = 12.21 inches