# Materials

This section imports and configures material properties for the Steel Tub Girder Bridge.

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**Navigation:** Properties > Materials

For detailed parameter explanations, see the [Materials Reference](https://docs.openbrim.org/templates/steel-tub-girder-bridge-workflow/properties-stg/materials-stg).
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## Steps

### Step 1: Navigate to Materials

Navigate to **Properties > Materials** in the tree view.

![Materials navigation](https://openbrim.atlassian.net/wiki/download/attachments/2168848389/image-20230216-154352.png?api=v2)

### Step 2: Import Materials from Library

Click the **three-dot icon** on the first cell and select **Import Material**.

![Import material](https://openbrim.atlassian.net/wiki/download/attachments/2168848389/image-20230216-160455.png?api=v2)

Import the following materials:

| Material  | Library Path                                                                 |
| --------- | ---------------------------------------------------------------------------- |
| Fc\_4ksi  | OpenBrIM Bridge Objects > Concrete Material Database (US) > US AASHTO        |
| Fc\_5ksi  | OpenBrIM Bridge Objects > Concrete Material Database (US) > US AASHTO        |
| A709\_50  | OpenBrIM Bridge Objects > Steel Material Database (US) > Structural Steel    |
| A709\_50W | OpenBrIM Bridge Objects > Steel Material Database (US) > Structural Steel    |
| A615\_60  | OpenBrIM Bridge Objects > Steel Material Database (US) > Reinforcement Steel |

![Material selection](https://openbrim.atlassian.net/wiki/download/attachments/2168848389/image-20230216-155752.png?api=v2)

### Step 3: Assign Stress-Strain Models

For **Fc\_4ksi**, click the **three-dots** icon, select **Edit**, and set **Stress/Strain Model** to **Mander Concrete**.

![Edit material](https://openbrim.atlassian.net/wiki/download/attachments/2168848389/image-20230216-160900.png?api=v2)

![Mander concrete](https://openbrim.atlassian.net/wiki/download/attachments/2168848389/image-20230216-161105.png?api=v2)

### Step 4: Configure Reinforcement Steel

For **A615\_60**, set **Stress/Strain Model** to **Bilinear Steel**.

![Bilinear steel](https://openbrim.atlassian.net/wiki/download/attachments/2168848389/image-20230216-162031.png?api=v2)

### Step 5: Create Rigid Material

Create a new material named **RigidMaterial** for rigid elements.

![Rigid material](https://openbrim.atlassian.net/wiki/download/attachments/2168848389/image-20230216-162331.png?api=v2)

## Verification

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After completing these steps, all required materials are defined for the bridge model.
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