Bridge Diaphragm Property Form

Access the Bridge Diaphragm Property form, with the Bridge Modeler license enabled, as follows:

Click the Bridge menu > Bridge Diaphragm command, or on the Bridge Wizard highlight the Diaphragm Definition item and then click the Define/Show Diaphragm button, to display the Define Bridge Diaphragm Properties form.
Click the Add New Diaphragm button or highlight a previously defined definition and click the Add Copy of Diaphragm or Modify/Show Diaphragm button to display the Bridge Diaphragm Property form.

After the diaphragm has been defined, assign it to the bridge model using Bridge Objects.

Use the Bridge Diaphragm Property form to specify the type and parameters for a bridge diaphragm.

Select Diaphragm Type to be used for this definition:

Diaphragm Thickness edit box. Specify the diaphragm thickness in the current length units.

Chord and Brace option. The chord and brace diaphragm applies to steel bridges only.

Include Top Chord check box and drop-down list. When this check box is checked, the top chord will be included in the diaphragm. Use the drop-down list to select a frame section property for the chord.
Include Brace check box and display area. When this check box is checked, specify the type of brace: V Brace, Inverted V Brace, or X Brace. The selected option will appear in the display area on the right side of the form.
Include Bottom Chord check box and drop-down list. When this check box is checked, the bottom chord will be included in the diaphragm. Use the drop-down list to select a frame section property for the chord.
Brace Work Point Location. Use the options in this area to specify the location of the brace work point.

Elevation Change From Top Work Point to Top of Adjacent Girder edit box. Enter a value in the current units for the change in elevation of the top work point of the chord and brace and the elevation of the top of the adjacent girder.
Elevation Change From Bottom Work Point to Bottom of Adjacent Girder edit box. Enter a value in the current units for the change in elevation of the bottom work point of the chord and brace and the elevation of the bottom of the adjacent girder.

Beam Section Property drop-down list. Use the drop-down list to select a frame section property for the chord. As the name suggests, use the Elevation Change From Top of Beam to Top of Highest Adjacent Girder edit box to specify in the current length units the distance from the top of the beam section to the top of the highest adjacent girder.

After defining a diaphragm, assign it to a bridge span as part of the bridge object definition.