External Diaphragm [STG]

Location

Girders: Pick the girders for which the external diaphragm will be generated.

Skew Angle: Define the skew angle for the diaphragm.

Is it an Intermediate or Pier/End Diaphragm? [Intermediate/Pier-End]: This parameter can be used to define whether the diaphragm is an intermediate diaphragm or a pier-end diaphragm.

Station [Start/ End]: If the diaphragm is defined as an intermediate diaphragm, the station relative to the PGL can be specified using this parameter to further define the diaphragm's location. This parameter is not applicable for pier-end diaphragms.

Select Pier/End: If the diaphragm is defined as a pier-end diaphragm, this parameter can be used to define the location of the diaphragm, as the support line can be selected. If the diaphragm is defined as intermediate, this parameter will not be applicable.

Offset from Pier/End: For pier-end diaphragms, an offset value can be defined with respect to the support line chosen with the Select Pier/End parameter.

Material: Assign a material to the diaphragm. A material can either be imported or assigned from a previously defined one under Properties - Materials.

Section Details

Does the Top Flange Exist? [YES/NO]: Specify whether a top flange exists or not.

Does the Bottom Flange Exist? [YES/NO]: Specify whether a bottom flange exists or not.

Plate Thickness: The plate thickness can be specified using this parameter. For visual representation, refer to the figure below.

Top Flange Width: If the top flange exists and the parameter is defined with the option 'YES,' the width of the top flange can be specified using this parameter; otherwise, it will be not applicable (N/A). For visual representation, refer to the figure below.

Top Flange Thickness: If the top flange exists and the parameter is defined with the option 'YES,' the thickness of the top flange can be specified using this parameter; otherwise, it will be not applicable (N/A). For visual representation, refer to the figure below.

Splice Gap at Top Flange: For visual representation, refer to the figure below.

Bottom Flange Width: If the bottom flange exists and the parameter is defined with the option 'YES,' the width of the bottom flange can be specified using this parameter; otherwise, it will be not applicable (N/A). For visual representation, refer to the figure below.

Bottom Flange Thickness: If the bottom flange exists and the parameter is defined with the option 'YES,' the thickness of the bottom flange can be specified using this parameter; otherwise, it will be not applicable (N/A). For visual representation, refer to the figure below.

Splice Gap at Bottom Flange: The figure has a splice gap at the bottom flange defined with a value of 0, while for the top flange, it is different from zero. See the figure below for visual representation.

Web Depth Computation [Use Girders Working Point/User Input]: The diaphragm web depth can be calculated based on two methods, specified by the definition of this parameter. The web depth can either be generated based on the girder geometry or manually defined by the user through the Web Depth and Diaphragm Vertical Offset from Top of Girder Web parameters.

Web Depth: If the Web Depth Computation parameter is set to ‘User Input,’ the Web Depth can be manually defined by the user using this parameter. Otherwise, if Web Depth Computation is set to ‘Use Girders Working Point,’ this parameter will be N/A.

Diaphragm Vertical Offset from Top of Girder Web: If the Web Depth Computation parameter is set to ‘User Input,’ the diaphragm's vertical offset from the top of the girder web (along the Z-axis) can be manually defined by the user using this parameter. Otherwise, if Web Depth Computation is set to ‘Use Girders Working Point,’ this parameter will be N/A.

Open

Section Details Input Parameters

3D Details

Cope (Bottom Corners): For visual representation, refer to the figure below.

Does a Manhole Exist? [YES/NO]: This parameter can be used to specify whether or not a manhole exists on the diaphragm.

Manhole Width: If the manhole exists (parameter defined with the option 'YES'), the width of the manhole can be adjusted using this parameter; otherwise, this parameter will not be applicable.

Manhole Height: If the manhole exists (parameter defined with the option 'YES'), the height of the manhole can be adjusted using this parameter; otherwise, this parameter will not be applicable.

Manhole Edge Radius: If the manhole exists (parameter defined with the option 'YES'), the edge radius of the manhole can be adjusted using this parameter; otherwise, this parameter will not be applicable.

Manhole Vertical Offset: If the manhole exists (parameter defined with the option 'YES'), the vertical offset of the manhole can be adjusted using this parameter; otherwise, this parameter will not be applicable.

Open

3D Details Input Parameters

Stiffener

Transverse Stiffener Data:

• Offset From Center: The offset from the center of the diaphragm can be defined by this parameter. When looking upstream along PGL, a negative value indicates a position to the left.

• Stiffener Thickness: The thickness of the stiffeners can be adjusted using this parameter.

• Stiffener Width: The width of the stiffeners can be adjusted using this parameter.

• Distance from Top of Web: The distance from the top of the web to the stiffener can be adjusted using this parameter.

• Distance from Bottom of Web: The distance from the bottom of the web to the stiffener can be adjusted using this parameter.

• Vertical Clip Height: Vertical Clip Height for the stiffener can be adjusted by this parameter.

• Horizontal Clip Width: Horizontal Clip Width for the stiffener can be adjusted by this parameter.

FEA

Axial Rigidity Coefficient: This parameter can be used to define the axial rigidity of the diaphragm.