> For the complete documentation index, see [llms.txt](https://docs.openbrim.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openbrim.org/examples/concrete-bridge-examples/example-concrete-u-girder-bridge/superstructure-ex1-cug/temporary-support-ex1-cug/single-elements-ex1-cug.md).

# Single Elements

This section defines temporary support elements for segmental construction of the Concrete U Girders.

{% hint style="info" %}
**Navigation:** Superstructure > Temporary Support > Single Element
{% endhint %}

## Steps

### Step 1: Understand Temporary Support Purpose

When constructing Concrete U Girders over a span, construction is executed in a **segmental** manner due to transportation constraints. Stability issues arise during this process, requiring temporary supports at specific points.

### Step 2: Navigate to Single Element

Navigate to **Temporary Support > Single Element** in the tree view.

![Navigation](https://openbrim.atlassian.net/wiki/download/attachments/2265022465/image-20230829-140239.png?api=v2)

### Step 3: Select Girder

Click on the **Girders** column and select **CUG1** from the dropdown.

### Step 4: Pick Support Locations

Click **Pick** from the dropdown to select temporary support locations graphically.

![Pick Locations](https://openbrim.atlassian.net/wiki/download/attachments/2265022465/image-20230829-142944.png?api=v2)

Enter the name as **TSupL1** for the first support.

### Step 5: Create Supports for Both Girders

The temporary support locations for **CUG1** also apply to **CUG2** since they are built identically as segmental girders.

![Both Girders](https://openbrim.atlassian.net/wiki/download/attachments/2265022465/image-20230829-143746.png?api=v2)

{% hint style="info" %}
Temporary supports are also used during **closure pour casting** operations of the girders.
{% endhint %}

### Step 6: Define Additional Supports for Fixity Changes

**Temporary Supports 3, 5, 7, and 9** have fixity states that change during construction. These supports are redefined to accommodate the changes (explained in detail on the Construction Stages page).

![Additional Supports](https://openbrim.atlassian.net/wiki/download/attachments/2265022465/image-20230829-150815.png?api=v2)

### Step 7: Configure Fixity Values

Navigate to the **Fixity** spreadsheet.

![Fixity Tab](https://openbrim.atlassian.net/wiki/download/attachments/2265022465/image-20230829-152020.png?api=v2)

Enter the fixity values for each temporary support as shown. The fixity pattern varies based on whether the support needs to resist axial forces during specific construction stages.

## Verification

{% hint style="success" %}
After completing these steps, the temporary supports are defined and ready for use in construction stage definitions.
{% endhint %}


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