Ultimate limit state bending calculations (article 6.1 of EC2)
Eurocode 2: Reinforced concrete

• Rectangular section bd.

d, useful height; d ' distance from any compressed steel to the most compressed fiber.

• Concrete class up to C 50/60: $f_{ck}⩽50$ MPa – Steel B 500.

• Relative deformations expressed in ‰.

The formulas given below correspond to the use of the parabola-rectangle diagram [ , figure 3].