> 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/structuralmaterial.md).

# StructuralMaterial

## Material

Material is the basic entity affecting the behaviour of the structure. It is subsequently applied to a chosen profile ([StructuralCrossSection](/structural-analysis-elements/structuralcrosssection.md)). The user can use a pre-defined material or change the properties to get a custom one. The predefined materials correspond to materials defined in particular technical codes.The specification in excel:

### Specification in excel:

| Name of the column header | Type of data |                                    Value example or enum definition                                    | Required value | Description                                                                                                                                                                                                                                  |
| ------------------------- | ------------ | :----------------------------------------------------------------------------------------------------: | -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Name                      | String       |                                                  S235                                                  | yes            | Human readable unique name of the material \*see notes                                                                                                                                                                                       |
| Type                      | Enum         | <p>Concrete<br></p><p>Steel<br></p><p>Timber<br></p><p>Aluminium<br></p><p>Masonry<br></p><p>Other</p> | yes            | The type of material                                                                                                                                                                                                                         |
| Subtype                   | String       |                                               Hot rolled                                               | no             | The subtype of the material, e.g. hot rolled, cold formed, stainless steel, prestressed concrete, fiber-reinforced concrete, UHPC etc.                                                                                                       |
| Quality                   | String       |                                                  S235                                                  | yes            | <p>The quality grade of the material. Use a commonly known naming of grades of specific structural material. Example:</p><p>Steel - S235, S275, S355...</p><p>Concrete - C16/20, C25/30, C30/35...</p><p>Timber - C18, C22, D18...</p>       |
| Unit mass \[kg/m3]        | Double       |                                                  7850                                                  | no             | Self-weight of the material                                                                                                                                                                                                                  |
| E modulus \[MPa]          | Double       |                                                 210000                                                 | no             | Young's modulus of elasticity                                                                                                                                                                                                                |
| G modulus \[MPa]          | Double       |                                                  12500                                                 | no             | Shear modulus                                                                                                                                                                                                                                |
| Poisson Coefficient       | Double       |                                                   0,2                                                  | no             | Poisson coefficient                                                                                                                                                                                                                          |
| Thermal expansion \[1/K]  | Double       |                                                0,000012                                                | no             | The coefficient of thermal expansion of the material                                                                                                                                                                                         |
| Design properties         | String       |                                         1\|1.1; 2\|4.8; 9\|1100                                        | no             | Custom design characteristics of the material. The format of the data has to follow this convention: "label of the design property" "\|" "value of the design property" The list of available properties with indexes can be found in Annex. |
| Id                        | String       |                                  6bbd256e-0225-4ee5-91e5-c7ef791a33cb                                  | no             | Unique attribute designation                                                                                                                                                                                                                 |

## Notes

{% hint style="info" %}
"**Name**" is recommended to set the same as the "**Quality**" of the defined material.
{% endhint %}