> 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/annexes/supported-design-properties-of-the-materials.md).

# Supported design properties of the materials

## Steel Specific Material Properties

| Index | Design property | Unit | Description                                                                            |
| ----- | --------------- | ---- | -------------------------------------------------------------------------------------- |
| 1     | fy              | Mpa  | Yield strength                                                                         |
| 2     | fu              | Mpa  | Ultimate strength                                                                      |
| 3     | fu(minimum)     | MPa  | The specified minimum tensile strength                                                 |
| 4     | Ry              | -    | The ratio of the expected yield stress to the specified minimum yield stress           |
| 5     | Rt              | -    | value used to calculate the expected tensile strength for the seismic detailing checks |

## Concrete Specific Material Properties

| Index | Design property | Unit | Description                                                             |
| ----- | --------------- | ---- | ----------------------------------------------------------------------- |
| 6     | fck             | Mpa  | Characteristic compressive cylinder strength                            |
| 7     | fcm             | Mpa  | Mean compressive strength                                               |
| 8     | fctm            | Mpa  | Mean tensile strength                                                   |
| 9     | fctk 05         | Mpa  | Five percent quantile of tensile strength                               |
| 10    | fctk 95         | Mpa  | Ninety five percent quantile of tensile strength                        |
| 11    | eps c2          | -    | Strain at reaching maximum strength for calculation of bearing capacity |
| 12    | eps cu2         | -    | Ultimate strain for calculation of bearing capacity                     |
| 13    | eps c3          | -    | Strain at reaching maximum strength for calculation of load effect      |
| 14    | eps cu3         | -    | Ultimate strain for calculation of load effect                          |

## Timber Specific Material Properties

| Index | Design property | Unit | Description                                                |
| ----- | --------------- | ---- | ---------------------------------------------------------- |
| 15    | E0.05           | Mpa  | 5% Modulus of elasticity parallel to grain                 |
| 16    | E90, mean       | Mpa  | Mean modulus of elasticity perpendicular to grain          |
| 17    | fmk             | Mpa  | Characteristic bending strength                            |
| 18    | ft0k            | Mpa  | Characteristic tensile strength parallel to grain          |
| 19    | ft90k           | Mpa  | Characteristic tensile strength perpendicular to grain     |
| 20    | fc0k            | Mpa  | Characteristic compressive strength parallel to grain      |
| 21    | fc90k           | Mpa  | Characteristic compressive strength perpendicular to grain |
| 22    | fvk             | Mpa  | Characteristic shear strength                              |