The screen capture below shows a section designer section with 3 cores. Different concrete properties can be specified for the three concrete regions: core concrete (shown in red), other concrete (shown in blue), and outer concrete (shown in yellow). For each of these regions, you can specify one of the following properties:

• Core (Core 1, Core 2, or Core 3): the program will automatically calculate confined concrete properties based on the confinement (rebar sizes, spacing, etc.) specified for each core in the section designer.
• Mander-Unconfined: Unconfined Mander model
• Mander-Confined(C): Confined Mander model for circular sections
• Mander-Confined(R): Confined Mander model for rectangular sections

Clicking the "Show" button, will allow you to specify individual concrete model parameters, if applicable. Please note that some concrete model properties are taken directly from the material definition and are not editable. For Core model, none of the properties are editable, because they are automatically determined from the properties specified on the "Caltrans Section Properties" form.

See also

• Materials Stress-Strain Curves Technical Note (available via "Help > Documentation > Technical Notes")