> 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/steel-i-girder-bridge-workflow/superstructure-sig/stiffeners-sig/longitudinal-stiffener-sig.md).

# Longitudinal Stiffener \[SIG]

This object introduces longitudinal stiffeners without a finite element (FE) representation, and the Steel I Girder code-check object will employ them in its code-checking functionality.

## General

**Girder:** Select a girder for defining the location of the stiffener.

**Long. Stiff. Data:**

* **Start Station:** Start station along the PGL.
* **Clear Vert. Dist. from Top Flange to Long. Stiff.(Start Station):** For visual representation, refer to the figure below.
* **End Station:** End station along the PGL
* **Clear Vert. Dist. from Top Flange to Long. Stiff.(End Station):** For visual representation, refer to the figure below.

![image-20241007-145231.png](https://openbrim.atlassian.net/wiki/download/attachments/2230714514/image-20241007-145231.png?api=v2)

**Side of Web \[Both/Right/Left]:** When looking up station along the PGL, you have the option to position the stiffener on the right, left, or both sides of the web.

**Material:** Material of the stiffener. Materials can either be imported or assigned from previously defined ones.

## Dimensions

Parameters of Dimensions tab can be used for further definitions of the 3D model of the object.

**Stiffener Thickness:** The thickness of the stiffener in the Z direction can be specified using this parameter.

**Stiffener Width:** The width of the stiffener in the transverse direction can be specified using this parameter.

![image-20240827-123324.png](https://openbrim.atlassian.net/wiki/download/attachments/2230714514/image-20240827-123324.png?api=v2)

## IFC

**Type \[IfcPlate/IfcMember/IfcBuildingElementProxy]:** The IFC entity type for BIM export.

**Predefined Type \[STIFFENER\_PLATE/BASE\_PLATE/COVER\_PLATE/FLANGE\_PLATE/GUSSET\_PLATE/SPLICE\_PLATE/WEB\_PLATE/USERDEFINED/NOTDEFINED]:** The IFC Predefined Type is specified using this parameter.

**Parent \[Bridge/Superstructure/Deck/Substructure/Foundation/Approach\_Structure/Retaining\_Structure]:** The IFC Parent is specified using this parameter to define the hierarchy relationship in the IFC model.

## Quantities

**Volume:** The total volume of the longitudinal stiffener plate. (Read-only)

**Weight:** The total weight of the longitudinal stiffener based on volume and material density. (Read-only)


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