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Ultimate limit state

Bending moment with/without normal force is verified in accordance with EN 1992-1-1, chapter 6.1

The verification of ultimate limit state is based on following assumptions:

  • plane sections remain plane
  • the strain in reinforcement is the same as in the surrounding concrete
  • the tensile strength of the concrete is ignored
  • the stresses in the concrete in compression are derived from the design stress-strain relationship (parabola-rectangle diagram)
  • the stresses in the reinforcing steel are derived from the design curve with an inclined top branch with a strain limit

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