# External CrossFrame K Bot \[STG] ## Location **Girders:** Specify two girders for which the crossframe will be generated in between. **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/2421489870/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. ## Sections **Top Chord Section:** Assign a section for the top chord, which can be imported from the AISC database by the users. The finite element representation is in the form of a truss. **Bottom Chord Section:** Assign a section for the bottom chord, which can be imported from the AISC database by the users. The finite element representation is in the form of a truss. **Diagonal Chord Section :** Assign a section for the diagonal chord, which can be imported from the AISC database by the users. The finite element representation is in the form of a truss. ![image-20241026-120314.png](https://openbrim.atlassian.net/wiki/download/attachments/2421489870/image-20241026-120314.png?api=v2) ## Chord Geometry The geometry of External Crossframe K Bot 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 vertical offset of the top chord relative to the top of the tub girder's web. **Top Chord- Horz. Offset from Center of Web**: This parameter can be used to define the horizontal offset of the top chord from the center of the web. **Dia. Chord- Top Vert. Offset from Top of Web**: This parameter can be used to define the vertical offset of the diagonal chords relative to the top of the web. **Dia. Chord- Top Horz. Offset from CL of Web**: This parameter can be used to define the horizontal offset of the diagonal chord from the CL of the web. **Dia. Chord- Top Inner Offset**: This parameter can be used to define the inner offset of the diagonal chord on the top. **Dia. Chord- Bot. Vert. Offset from Bot. of Web**: This parameter can be used to define the vertical offset of the diagonal chords relative to 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 can be used to define the vertical offset of the bottom chord relative to the bottom of the web. **Bot. Chord- Horz. Offset from Center of Web**: This parameter can be used to define the horizontal offset of the bottom chord from the center of the web. **Top Chord Orientation Angle**: This parameter can be used to define the orientation angle of the top chord. **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. **Bottom Chord Orientation Angle**: This parameter can be used to define the orientation angle of the bottom chord. ![image-20241026-121210.png](https://openbrim.atlassian.net/wiki/download/attachments/2421489870/image-20241026-121210.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. ## 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/2421489870/image-20240321-191107.png?api=v2) ![image-20241026-121647.png](https://openbrim.atlassian.net/wiki/download/attachments/2421489870/image-20241026-121647.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. --- # Agent Instructions: 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. 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