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Introduce the required values and press the "Calculate" button to get the interaction diagram and the utilisation ratio of the section.
Interaction diagram
Explanation

A section interaction diagram is the set of combined loads (bending and axial) that will cause the section to fail. To obtain this mentioned set of loads, a pivot based diagraman corresponding to different strain distributions in the section is calculated. The methodology is based on the Eurocode 2 and the Spanish code EHE as explained below:

Methodolody: Expand explanation
Calculation process
 Geometrical characteristics Heigth (mm) (h): Width (mm) (b): Upper reinforcement (mm^2) (A2): Lower reinforcement (mm^2) (A1): Upper concrete cover (mm) (R2): Lower concrete cover (mm) (R1):
 Material characteristics Steel yielding limit (MPa) (fys): Steel partial factor: Typical values: Persistent & Transient situation:1.15; Accidental situation:1.0; Concrete resistance (MPa) (fck): Concrete partial factor: Typical values: Persistent & Transient situation::1.5; Accidental situation:1.2; Steel Yound modulus (N/mm^2) (Es): Typical value: 210000 MPa;
 Interaction diagramam parameters Maximum concrete failure strain in bending: Concrete crushing strain (pure compression): Deformación de rotura del acero:
 Loads Axil (N) (kN): Bending moment (M) (kN*m): The forces on the figure are positive
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