Location
Girders: Choose the two girders that are connected by the cross frame.
Skew Angle [deg]: 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.
Station [ft][Start/End]: Enter the station along the PGL. When dealing with curved girder bridges, collecting distance along the girder length can lead to different inputs for the right and left girder that are connected by cross frames, causing ambiguity. Therefore, collecting the station along the PGL is a more reliable solution to avoid such issues. Furthermore, since cross frames are typically continuous in the transverse direction, entering the same station for all cross frames ensures that their locations are consistent between each girder.
The same principle can be applied for skewed cross frames. If the user enters the same station and skew values for the cross frames between Girder 1-2, Girder 2-3, and Girder 3-4, it ensures continuity between the cross frames. It should also be noted that the cross frames are positioned along a line perpendicular to the PGL, which is rotated according to the entered skew value.
Inaccurate finite element models and disconnected nodes/elements in the cross frame can occur if the entered station values are not >= the girder start station or <= the girder end station. This can cause stability issues in the finite element model. To ensure correct station input, users should select the start/end options from the station input. This approach is especially recommended for cross frames located at the beginning or end of girders.
Sections
Top Chord Section - Bottom Chord Section - Diagonal Chord Section: Assign a section for the top/bottom/diagonal chord, which can be imported from the AISC database by the users. The finite element representation is in the form of a truss.
Gusset Plate
The parameters listed below are exclusively used for 3D representation and do not have any impact on design or finite element analysis at present.
Select Bottom Plate Geometry:
Top Chamfer height [in]:
Top Chamfer width [in]:
Top gusset width [in]:
Top gusset height [in]:
Top gusset offset from top of web [in]:
Bottom gusset width [in]:
Bottom gusset height [in]:
Bottom gusset offset from bottom of web [in]:
Center gusset plate width [in]:
Center gusset plate height [in]:
Center gusset plate offset from top of web [in]:
Gusset plate thickness [in]:
Web centerline to gusset plate edge distance [in]:
Gusset plate material:
Gusset Plate Bolts
Top Gusset Plate Bolt Group:
Bottom Gusset Plate Bolt Group:
Bolt Column Vertical Edge Distance [in]:
Bolt Column Horizontal Edge Distance [in]:
Bolt Vertical Spacing [in]:
Bolt Horizontal Spacing [in]:
Segments of Bolts:
Gusset Plate Bolt Property:
Show Bolts (Detailing):
Stiffener
The parameters listed below are exclusively used for 3D representation and do not have any impact on design or finite element analysis at present.
vertical stiffener thickness [in]:
vertical stiffener width [in]:
Material:
Geometry
These parameters are used for both computing the member end offset of cross frame truss elements in finite element analysis and 3D representation.
Top Chord - Vertical Distance of WP from top of web [in]:
Top Chord - Horizontal Distance of WP center of web [in]:
Top Chord - Inner Offset from WP [in]:
Diagonal Chord - Vertical offset from WP of Top chord [in]:
Diagonal Chord - Horizontal offset from WP of Top chord [in]:
Diagonal Chord - Vertical offset from WP of Bottom chord [in]:
Diagonal Chord - TopSide Inner Offset from WP [in]:
Diagonal Chord - BottomSide Inner Offset from WP [in]:
Bottom Chord - Vertical Distance of WP from Bottom of web [in]:
Bottom Chord - Horizontal Distance of WP from center of web [in]:
Bottom Chord - Inner Offset from WP [in]:
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