> 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/templates/concrete-u-girder-bridge-workflow/reports-cug/elastomeric-bearing-stiffness-cug.md).

# Elastomeric Bearing Stiffness \[CUG]

To obtain the calculations for the values of the Steel Elastomeric Bearing as a report, this section can be used.

## General

**Bridge:** Specify the bridge.

**Bearings:** Specify the bearings for which the report will be generated.

{% hint style="info" %}
**Elastomeric Bearing Stiffness Report Includes**

1. **Geometry and Proportioning Table**

* Dimensions of the elastomeric bearing.

2. **Material Properties Check**

* As per **AASHTO 14.7.5.2**, the elastomer shall have a specified shear modulus between **0.080 ksi and 0.175 ksi**.

3. **Compression Stiffness Calculations**

* The calculated compression stiffness value will be assigned to **Tz** when the insertion point is chosen for the definition of the elastomeric bearing.

4. **Shape Factor Calculations**

* Calculations for the shape factors of both **internal** and **external layers**.

5. **Effective Compression Modulus Calculations**

* Calculations for the effective compression modulus of both **internal** and **external layers**.

6. **Compressive Stiffness Calculations**

* Calculations for the compressive stiffness of both **internal** and **external layers**.

7. **Shear Stiffness Calculations**

* The calculated shear resistance will be assigned to **Tx** and **Ty** when the insertion point is chosen for bearing definitions. ![image-20241122-110459.png](https://openbrim.atlassian.net/wiki/download/attachments/2394357788/image-20241122-110459.png?api=v2)
  {% endhint %}


---

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