> For the complete documentation index, see [llms.txt](https://gitbook.saf.guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gitbook.saf.guide/structural-analysis-elements/structuralsurfacememberregion.md).

# StructuralSurfaceMemberRegion

## Region of different plate thickness

This object defines particular areas of the StructuralSurfaceMember with different thicknesses.

![](/files/3KVZ7JNrD3IU1mISIt9f)

### Specification in the excel:

| Name of the column header | Type of data |       Value example or enum definition       | Required value | Description                                                                                                                                                                                                                                                                                                                                                                                                            |
| ------------------------- | ------------ | :------------------------------------------: | -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Name                      | String       |                      R1                      | yes            | Human readable unique name of the object                                                                                                                                                                                                                                                                                                                                                                               |
| Material                  | String       |                    MAT\_1                    | yes            | The name reference to the existing, valid name of the [StructuralMaterial](https://saf.guide/Content/A_Objects/3_StructuralMaterial.htm) object.                                                                                                                                                                                                                                                                       |
| Thickness \[mm]           | Double       |                      200                     | yes            | The thickness of the StructuralSurfaceMemberRegion Thickness is considered in total.                                                                                                                                                                                                                                                                                                                                   |
| System plane at           | Enum         | <p>Bottom<br></p><p>Centre<br></p><p>Top</p> | yes            | Defines position of the system plane (local x and y-axis) of the StructuralSurfaceMemberRegion and determines the alignment of the region. Top: the StructuralSurfaceMemberRegion is aligned with the top surface of the [StructuralSurfaceMember](https://saf.guide/Content/A_Objects/8_StructuralSurfaceMember.htm), Bottom: it is aligned with the bottom surface.                                                  |
| 2D Member                 | String       |                      S13                     | yes            | The name of the [StructuralSurfaceMember](https://saf.guide/Content/A_Objects/8_StructuralSurfaceMember.htm) to which is the region situated.                                                                                                                                                                                                                                                                          |
| Nodes                     | String       |             N81; N263; N659; N660            | yes            | All nodes that belong to StructuralSurfaceMemberRegion and define its geometric shape. The names of the nodes are separated by ; (semicolon) and space.                                                                                                                                                                                                                                                                |
| Edges                     | String       |            Line; Line; Line; Line            | yes            | Defines shape of the curve between two next nodes. Supported strings are: Line; Bezier; Circular Arc; Parabolic arc; Spline; Circle and Point; Circle by 3 points. The names are separated by ; (semicolon) and space.                                                                                                                                                                                                 |
| Eccentricity ez \[mm]     | Double       |                     -125                     | yes            | The eccentricity of the slab may be input. Eccentricity is measured from the system plane – local x and y-axis and the direction is in local z-axis.                                                                                                                                                                                                                                                                   |
| Area \[m2]                | Double       |                     1.485                    | no             | The value of the surface area of the StructuralSurfaceMemberRegion                                                                                                                                                                                                                                                                                                                                                     |
| Parent ID                 | String       |     67b35d84-3d04-47aa-aa4a-dc1263982320     | no             | <p>Is filled for objects created be dividing curved geometry to series of straight line objects.<br><br>Parent ID will ensure that curved edge is imported as straight parts to nonsupporting application, and back to original supporting application as curved geometry.</p><p>To ensure successful round trip of segmented objects and their related objects, Parent ID needs to be present in both directions.</p> |
| Id                        | String       |     39f238a5-01d0-45cf-a2eb-958170fd4f39     | no             | Unique attribute designation                                                                                                                                                                                                                                                                                                                                                                                           |

## Notes

{% hint style="info" %}
StructuralSurfaceMemberRegion examples of system-plane location and eccentricity effect.
{% endhint %}

![](/files/ptnz1Jul5rmPyUSAKgMr)