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Assumption and limitations

There are the following assumptions:

• Strain and stress of diagram defined in properties of material will be used

• Concrete – linear stress-strain diagram dependent on:
  • type of E-modulus - short-term (E_c) or long-term (E_c,eff) E-modulus for preparation of stress-strain diagram
  • cracking of the cross-section
    • un-cracked cross-section - stress-strain diagram with tensile concrete is considered
    • cracked cross-section - stress-strain diagram without tensile concrete is considered
• Reinforcement – linear stress-strain diagram with tensile branch

• Standard REDES reinforcement is considered

With the following limitations

• The area of longitudinal reinforcement is not subtracted from concrete area in the first step

As an example the preparation of the stress-strain diagram for C25/30 (f_ck = 25 MPa, E_c = 31 GPa) is visible from the following figures.

Concrete SLS short-term uncracked

Concrete SLS long-term uncracked

Concrete SLS short-term cracked

Concrete SLS long-term cracked

As an example for the reinforcement material the stress-strain diagram for B400C (f_yk = 400 MPa, E_s = 200 GPa) is visible from the following figure.

Note: The maximal stress in SLS diagram is used as 5 ∙ f_ck (f_yk) for concrete, reinforcement respectively.

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