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RF-CONCRETE Members Version 5

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2.2.2 Limitation of Stresses

Limitation of Stresses

Concrete compressive stresses

The concrete compressive stresses must be limited according to EN 1992-1-1, clause 7.2 (1), in order to avoid cracks or strong creep in case they could affect the structure's function. Therefore, clause 7.2 (2) recommends applying a reduction factor for the characteristic concrete compressive strength.

σc = k1 · fck 

The recommended value for k1 is 0.6.

Reinforcing steel stresses

To avoid inelastic strains, unallowable cracking, and deformations, the tension stresses in the reinforcement must be limited according to EN 1992-1-1, clause 7.2 (4). Clause 7.2 (5) recommends reduction factors for the characteristic tensile strength, which depend on the type of action combination.

  • σs = k3 ⋅ fyk   for characteristic action combination
  • σs = k4 ⋅ fyk   for indirect action (restraint)

The recommended values for k3 and k4 are 0.8 and 1.0.