# Internal Cross-frame X \[STG]

## Location

**Girder:** Specify the girder for which the crossframe will be generated.

**Skew Angle:** A positive skew value rotates the cross frame in a clockwise direction, while a negative skew value rotates it in a counterclockwise direction. It is important to remember that the cross frames are positioned at the specified station along a line perpendicular to the PGL, which is then rotated according to the entered skew value.

![](https://openbrim.atlassian.net/wiki/download/attachments/2394685446/image-20230307-082442.png?api=v2)

**Station\[Start/End]:** The station of the cross-frame with respect to the PGL can be defined using this parameter, either by selecting the Start/End options or through manual input.

![image-20240321-191813.png](https://openbrim.atlassian.net/wiki/download/attachments/2394685446/image-20240321-191813.png?api=v2)

## Sections

Assign a section for the top, bottom, or diagonal chord, which can be imported from the AISC database by users. The section data will be utilized for the 3D model of the object and will directly influence the Finite Element Analysis (FEA) and Finite Element Model (FEM).

**Top Chord \[YES/NO]:** This parameter can be used to specify whether a top chord exists or not. If this parameter is defined with the option "YES," the **Top Chord Section** parameter can be used to assign a section to the top chord of the cross frame. Otherwise, the **Top Chord Section** parameter will be N/A (not applicable).

**Bottom Chord \[YES/NO]:** This parameter can be used to specify whether a bottom chord exists or not. If this parameter is defined with the option "YES," the **Bottom Chord Section** parameter can be used to assign a section to the bottom chord of the cross frame. Otherwise, the **Bottom Chord Section** parameter will be N/A (not applicable).

**Top Chord Section:** Assign a section for the top chord.

**Diagonal Chord Section:** Assign a section for the diagonal chords.

**Bottom Chord Section:** Assign a section for the bottom chord.

![image-20241025-090230.png](https://openbrim.atlassian.net/wiki/download/attachments/2394685446/image-20241025-090230.png?api=v2)

## Chord Geometry

The geometry of Internal Crossframe X can be arranged using the Chord Geometry parameters. For a visual representation of each, refer to the figure below.

**Top Chord- Vert. Offset from Top of Web**: This parameter can be used to define the offset value of the top chord with respect to the top of the web.

**Top Chord- Horz. Offset from Center of Web**: This parameter can be used to define the horizontal offset value of the top chord with respect to the center of the web.

**Dia. Chord- Top Vert. Offset from Top of Web**: This parameter can be used to define the vertical offset value for the diagonal chord with respect to the top of the web.

**Dia. Chord- Top Horz. Offset from Top of Web**: This parameter can be used to define the horizontal offset of the diagonal chord from the top of the web.

**Dia. Chord- Top Inner Offset**: This parameter can be used to define the inner offset of the diagonal chord on the topside.

**Dia. Chord- Bot. Vert. Offset from Bot. of Web**: This parameter can be used to define the vertical offset value for the diagonal chord with respect to the bottom of the web.

**Dia. Chord- Bot. Horz. Offset from Bot. of Web**: This parameter can be used to define the horizontal offset of the diagonal chord from the bottom of the web.

**Dia. Chord- Bot. Inner Offset**: This parameter can be used to define the inner offset of the diagonal chord on the bottom side.

**Bot. Chord- Vert. Offset from Bot. of Web**: This parameter specifies the vertical offset between the working point (WP) of the Bottom Chord and the bottom of the web. The definition of this parameter will affect both the 3D model and FEM.

**Bot. Chord- Horz. Offset from Center of Web**: This parameter specifies the horizontal offset between the working point (WP) of the Bottom Chord and the center of the web. The definition of this parameter will affect both the 3D model and FEM.

**Top Chord Orientation Angle**: This parameter can be used to define the orientation angle of the top chord.

**Bottom Chord Orientation Angle:** Specify an angle for the bottom chord to rotate around its longitudinal axis.

**Left Dia. Chord Orientation Angle \[0/90/180/270]**: This parameter can be used to define the orientation angle of the left diagonal chord.

**Right Dia. Orientation Angle \[0/90/180/270]**: This parameter can be used to define the orientation angle of the right diagonal chord.

![image-20241026-112405.png](https://openbrim.atlassian.net/wiki/download/attachments/2394685446/image-20241026-112405.png?api=v2)

## Gusset Plate

The parameters listed below are exclusively used for 3D representation. "Gusset Plate" objects defined under the **Properties** tab can be assigned here. The gusset plates assigned in this section do not have FEM attributes but can be applied as weight loads if relevant definitions are made under the **Construction** section of the workflow, particularly in **Girder/Crossframe Construction** using the **Stiffener Gusset Plate Load** parameter.

**Top Gusset Plate**: Assign a previously defined gusset plate to the topside.

**Bottom Gusset Plate**: Assign a previously defined gusset plate to the bottom side.

**Center Gusset Plate**: Assign a previously defined gusset plate to the center plate.

**Top Plate - Vert. Offset From Top of Web:** The location of the top gusset plate with respect to the top of the web along the vertical direction can be defined by this parameter. For visual representation, refer to the figure provided below.

**Top Plate - Horz. Offset From Edge of Web:** The location of the top gusset plate with respect to the edge of the web along the horizontal direction can be defined by this parameter. For visual representation, refer to the figure provided below.

**Bottom Plate - Vert. Offset From Bottom of Web:** The location of the bottom gusset plate with respect to the bottom of the web along the vertical direction can be defined by this parameter. For visual representation, refer to the figure provided below.

**Bottom Plate - Horz. Offset From Edge of Web:** The location of the bottom gusset plate with respect to the edge of the web along the horizontal direction can be defined by this parameter. For visual representation, refer to the figure provided below.

**Center Plate - Vert. Offset From Top of Web:** The location of the center gusset plate with respect to the top of the web along the vertical direction can be specified by this parameter. For visual representation, refer to the figure below.

**Center Plate - Horz. Offset from Center of Bay:** The center distance between two girders, or in other words, the bay, can be used to specify the horizontal location of the center gusset plate, where a positive value offsets the center gusset plate to the right, and negative values offset the gusset plate to the left when looking upstation along the PGL.

**Show Gusset Plate\[YES/NO]:** The Gusset Plate object can be activated using this parameter.

![image-20241025-094544.png](https://openbrim.atlassian.net/wiki/download/attachments/2394685446/image-20241025-094544.png?api=v2)

## Stiffener

The parameters listed below are exclusively used for 3D representation. The stiffeners modeled here do not have FEM attributes but can be applied as weight loads if relevant definitions are made under the **Construction** section of the workflow, particularly in **Girder/Crossframe Construction** using the **Stiffener Gusset Plate Load** parameter.Refer to the figure below for a visual representation of each parameter.

**Stiffener Used \[YES/NO]**: This parameter determines whether further stiffener-related parameters are applicable. Selecting "NO" will make the parameters below display as "Not Applicable (N/A)." Selecting "YES" allows further definitions related to crossframe stiffeners.

**Vertical Stiffener Thickness**: This parameter can be used to adjust the thickness of the stiffeners in the longitudinal direction.

**Vertical Stiffener Width**: This parameter allows you to adjust the width of the vertical stiffeners.

**Vertical Distance from Top of Web**: This parameter can be used to define an offset value for the stiffeners from the top of the web.

**Vertical Distance from Bottom of Web**: This parameter can be used to define an offset value for the stiffeners from the bottom of the web.

**Top-Inner Chamfer**: This parameter defines the chamfer value for the inner section of the stiffeners' top side.

**Top-Outer Chamfer**: This parameter defines the chamfer value for the outer section of the stiffeners' top side.

**Bottom-Inner Chamfer**: This parameter defines the chamfer value for the inner section of the stiffeners' bottom side.

**Bottom-Outer Chamfer**: This parameter defines the chamfer value for the outer section of the stiffeners' bottom side.

**Material**: This parameter allows a material to be assigned to the stiffener. Materials can either be imported or selected from previously defined materials under **Properties - Materials**.

**Show Stiffener \[YES/NO]:** The Stiffener object can be activated using this parameter.

![image-20240321-191107.png](https://openbrim.atlassian.net/wiki/download/attachments/2394685446/image-20240321-191107.png?api=v2)

![image-20241026-113629.png](https://openbrim.atlassian.net/wiki/download/attachments/2394685446/image-20241026-113629.png?api=v2)

## FEA

**Top Chord Axial Rigidity Coefficient**: This parameter can be used to define the axial rigidity of the top chord.

**Diagonal Chord Axial Rigidity Coefficient**: This parameter can be used to define the axial rigidity of the diagonal chord.

**Bottom Chord Axial Rigidity Coefficient**: This parameter can be used to define the axial rigidity of the bottom chord.


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