# Tendon \[CBG]

## Tendon

**Box Girder:** Specify the box girder for which the tendons will be modeled.

**Elevation Data:** "Use the 'Edit...' option to specify the location of the tendons.

* **Reference Support Line:** At least two reference points must be defined for a tendon to be generated. Specify the support lines between which the tendons will be generated.
* **Longitudinal Offset:** Specify the longitudinal offset value from the support line along the PGL.
* **Elevation Offset:** This parameter specifies the distance from either the top or bottom of the box girder. The reference edge can be set using the 'Offset From' parameter.
* **Offset From \[Top/Bottom]:** The reference edge can be specified using this parameter.

**Web No (from left):** When looking up station along the PGL, Web No :1 is designated as the outermost left web.

**Web Alignment \[Left/Right]:** By using the data defined in the Detailing Tab of the Concrete Box Girder object (Clear Cover), tendons can be generated based on the 'Left' or 'Right' definitions of this parameter.

![image-20240925-111618.png](https://openbrim.atlassian.net/wiki/download/attachments/2230091889/image-20240925-111618.png?api=v2)

**Duct Outer Diameter:** The specified duct outer diameter will be visible in the 3D model of the tendon.

## Settings

**Prestressing Type \[Pre-tension/Post-tension]:** Specify the prestressing type of the tendon. If the ‘Post-tension' option is chosen, the 'Post-tension Type' parameter can be defined with the options 'Bonded' or 'Unbonded’.

**Exposure \[Internal/External]:** Set the type of exposure of tendon, **Internal** or **External**.

**Post-tension Type \[Bonded/Unbonded]:** Specify the post-tension type, **Bonded** or **Unbonded**.

## Properties

**Strand Area:**

**# of Strands:** Enter the number of strands for the tendon.

**Material:** Set a material for the strands. The material can either be imported or assigned from the previously defined materials in the Properties section.

**Anchor Set Length:** Anchor set length is user defined parameter.

**Wobble Friction Coefficient:** Enter the wobble friction coefficient used for short-term friction losses.

**Curvature Friction Coefficient (1/rad):** Enter the curvature friction coefficient used for friction losses along curved portions of the tendon.

## Jacking

**Jacking Method: Jacking type \[Start/End/Start then End/End then Start]:** Specify the jacking method applied to the tendon. Start and End refer to downstation and upstation ends of the tendon with respect to PGL.

**Jacking Force From Start: applied jacking force to the start of tendon.** Required unless Jacking Method is End-only.

**Jacking Force From End: applied jacking force to the end of tendon.** Required unless Jacking Method is Start-only.


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