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Reinforced concrete
RC staircase
Inclined slab (waist) on which the steps are cast. The waist works as a bending slab between its two supports: its main bars run along the slope, on the lower face.
Typical dimensions & rules
- •Waist: 12-15 cm thick
- •Comfort: 2r + g ≈ 60-64 cm (riser 16-18, going 26-30)
- •Main bars along the slope + transverse distribution
- •Anchored into landings and starting beam
Common mistakes to avoid
- ✗Main bars laid horizontally instead of along the slope
- ✗Unequal riser heights (danger + visible defect)
- ✗Waist cast without connection to landings
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