The Section Designer generates concrete stress-strain curves without tensile strength. Stress-strain curves may be reviewed within the Section Designer by using the concrete-model View controls.
To model concrete tensile strength, a material stress-strain curve may be converted into a user-defined constitutive model by selecting Define > Materials. A separate material must be created for each Mander confinement state. Then the Section Designer will apply this user-defined curve.
For parametric Mander material, which is not user-defined, stress-strain curves are automatically computed, though tensile strength is not recognized.