When cracks are not severe, there is no verification with respect to Serviceability Limit State. In the case of severe or very severe crack, substitute the Mou and Vou with Mos and Vos (moment and shear force originating in the forces operating in the Serviceability Limit State) as well as fe/γs the stress in the Serviceability Limit State in the formulas provided for calculating reinforcement.
BAEL 91 Code
If the crack is not severe verify the condition of element sensitivity to crushing.
If the crack is severe
- Allowable stress = minimum of the value
η=1.0 → for reinforcement RL,
η=1.6 → for reinforcement HA o φ ≥ 6 mm,
η=1.3 → for reinforcement HA o φ < 6 mm.
- Verify the condition of element sensitivity to crushing.
- φ of the reinforcement at the edges of the element ≥ 6 mm.
- For plates and deep beams whose thickness h ≥ 40 cm reinforcement spacing in the same layer should not exceed the minimum value (25 cm; 2h).
If the crack is very severe
- Allowable stress = minimum of the value
- Verify the condition of element sensitivity to crushing.
- φ of the reinforcement at the edges of the element ≥ 8 mm.
- for plates and deep beams whose thickness h ≥ 40 cm reinforcement spacing in the same layer should not exceed the minimum value.(20 cm; 1.5h).
BAEL 98 Code
If the crack is severe
- Allowable stress = minimum of the value:
η=1.0 → for reinforcement RL,
η=1.6 → for reinforcement HA o f ≥ 6 mm,
η=1.3 → for reinforcement HA o f < 6 mm.
- Verify the condition of element sensitivity to crushing.
- φ of the reinforcement at the edges of the element ≥ 6 mm.
- For plates and deep beams whose thickness h ≥ 40 cm reinforcement spacing in the same layer should not exceed the minimum value (25 cm; 2h).
If the crack is very severe
Allowable stress = minimum of the following value: 
.
- Verify the condition of element sensitivity to crushing.
- φ of the reinforcement at the edges of the element ≥ 8 mm.
- For plates and deep beams whose thickness h ≥ 40 cm reinforcement spacing in the same layer should not exceed the minimum value (20 cm; 1.5h).
The Condition of Element Sensitivity to Crushing [BAEL B.7.4]
Percent of reinforcement equals
ρ o = 0.0012 for steel RL 215 and 235.
ρo = 0.0008 for bars HA 400 or RL wire fabric with the diameter > 6 mm.
ρo = 0.0006 for bars HA 500 or RL wire fabric with the diameter <= 6 mm.