> 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/temporary-supports-sig/single-element-sig.md).

# Single Element \[SIG]

Users may want to ensure the stability of girders during the analysis of girder erection. Girders that are not connected with bracings may be unstable. To address this issue, the girders are supported at temporary support locations, and this element can be utilized for this purpose.

To create a temporary support under the girder and manage its construction/deconstruction, please refer to the Quick Guide available at the link below.

[Steel I Girder — Additional Bearing Construction and Deconstruction \[QG-18\]](/quick-guides/steel-i-girder-additional-bearing-construction-and-deconstruction.md)

##

**General**

**Insertion Point:** Pick..’ or ‘Select..’ an insertion point to define the location of the single element.

**Girder:** Pick the girder to be supported.

**Support Loc On Girder \[Top/Bottom]:** The single element can support the girder from either its top side or bottom side, determined by this parameter. This definition will affect both the FEM and the 3D model.

**Station:** The station, relative to the PGL, of the single element's girder portion can be specified using this parameter.

**Section:** The section of the element will be assigned to the beam elements in finite element analysis.

![image-20250820-081441.png](https://openbrim.atlassian.net/wiki/download/attachments/2125103134/image-20250820-081441.png?api=v2)

## Fixity

**Tx \[Fixed=-1/Free=0]:** Translational stiffness in X direction.

**Ty \[Fixed=-1/Free=0]:** Translational stiffness in Y direction.

**Tz \[Fixed=-1/Free=0]:** Translational stiffness in Z direction.

**Rx \[Fixed=-1/Free=0]:** Rotational stiffness about X axis.

**Ry \[Fixed=-1/Free=0]:** Rotational stiffness about Y axis.

**Rz \[Fixed=-1/Free=0]:** Rotational stiffness about Z axis.

## IFC

**Type:** The IFC entity type for BIM export. \[IfcBridge/IfcBridgePart/IfcBeam/IfcColumn/IfcSlab/IfcFooting/IfcPile/IfcBearing/IfcReinforcingBar/IfcReinforcingMesh/IfcTendon/IfcMechanicalFastener/IfcAlignment/IfcPositioningElement/IfcKerb/IfcGuardrail/IfcSurfaceFeature/IfcElementAssembly/IfcCableSegment/IfcSensor/IfcDistributionElement/IfcPlate/IfcWall/IfcRail/IfcRoad/IfcDiscreteAccessory/IfcDistributionSystem/IfcMember/IfcBuildingElementProxy]

**Predefined Type:** The IFC Predefined Type is specified using this parameter to define the structural classification of the element. \[ABUTMENT/ACCESSORY\_ASSEMBLY/ARCH/BEAM\_GRID/BRACED\_FRAME/CROSS\_BRACING/DECK/DILATATIONPANEL/ENTRANCEWORKS/GIRDER/GRID/MAST/PIER/PYLON/RAIL\_MECHANICAL\_EQUIPMENT\_ASSEMBLY/REINFORCEMENT\_UNIT/RIGID\_FRAME/SHELTER/SIGNALASSEMBLY/SLAB\_FIELD/SUMPBUSTER/SUPPORTINGASSEMBLY/SUSPENSIONASSEMBLY/TRACKPANEL/TRACTION\_SWITCHING\_ASSEMBLY/TRAFFIC\_CALMING\_DEVICE/TRUSS/TURNOUTPANEL/USERDEFINED/NOTDEFINED]

**Parent:** The IFC Parent is specified using this parameter to define the hierarchy relationship in the IFC model. \[BRIDGE/SUPERSTRUCTURE/DECK/SUBSTRUCTURE/FOUNDATION/APPROACH\_STRUCTURE/RETAINING\_STRUCTURE]


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.openbrim.org/templates/steel-i-girder-bridge-workflow/superstructure-sig/temporary-supports-sig/single-element-sig.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.