FAQ 004364 | Can I also use the horizontal part of a stress-strain curve for the cross-section de...

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Question

Can I also use the horizontal part of a stress-strain curve for the cross-section design in RF‑CONCRETE Members?

Answer

In the case of cross-section design, RF‑CONCRETE Members or CONCRETE uses in the calculation the stress-strain diagram for reinforcing steel according to DIN EN 1992‑1‑1, 3.2.7(2)a, that is, the increasing upper part up to ftk and the strain limitation of εud = 0.025.

Figure 01 - Tensile Strength f_tk with Increasing Part of Stress-Strain Curve

In RF‑CONCRETE Members or CONCRETE, there is no option to switch to the design with the horizontal part according to 3.2.7(2)b.

However, you can possibly use a user-defined material with ftk = fyk.

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