NCDOT Roadway Design Unit:

Shallow undercut and regular undercut components are built in the standard road templates. Both types of undercut can be shown in Roadway Designer by setting the parametric constraint. Define parametric constraint UC_Type as 1 for shallow undercut or 2 regular undercut. The levels are set up for users to have the ability to extract cross section earthwork quantities from.

Objective:

Demonstrate how Display rules are used to show shallow undercut and regular undercut in Roadway Designer. Using Parametric, define the two types of undercut.

Shallow Undercut: 12+60 to 14+00
Regular Undercut: 15+00 to 16+00

Dataset:

Video - Coming Soon
(Right-click on the video and select "Play" to play or pause the video)

Download dataset here... 4_Undercut..zip (529 KB)

NOTE: The content of the ZIP dataset file must be extracted to the root C:\ directory. Each chapter is then automatically expanded to the "C:\NCDOT Training\Roadway\CM" folder. This folder structure must be maintain to insure all saved ITL, DTM, and RDP paths are set accordingly.

Content:

04_Shallow_Undercut_and_Regular_Undercut.pdf
b5113.rdp
b5113_Ex.dtm
b5113_rdy.itl
b5113_rdy_cmd.dgn
jobrdy.gpk
b5113.ird

Exercise :

Step 1.
While in the file b5113_rdy_cmd.dgn, launch the Geopak Corridor Modeling tool.

Step 2.
Load the file b5113.rdp preference file.

Step 3.
Load the jobrdy.gpk file.

NOTE: Testing the Display Rules to show the two types of undercut.

Step 4.
Launch the Create Template dialog box.

Step 5.
Activate the L Road template under the Templates\Mainline folder.

Step 6.
In the lower right corner of the dialog box, click on the Test button.

Step 7.
In the lower right corner of the Test End Conditions dialog box, double-click on the values under the Value column to change the false value to true for display rule ShowUC and ShowSUC. Verify that the undercut component is turn on when true and off when false.

Step 8.
Close out of the Test End Conditions dialog box.

Step 9.
Locate the point RT_UC_Switch on the template L Road.

Step 10.
Edit point RT_UC_Switch by right mouse clicking on the point and choose Edit Points.

Step 11.
Change the Vertical constraint value for Constraint 2 from 0 to 1.

Step 12.
Click on the Apply button and notice the shallow undercut component that was once turn off for display is now turn on when the this switch point moved to the value of 1.

Step 13.
Change the Vertical constraint value for Constraint 2 from 1 to 2.

Step 14.
Click on the Apply button and notice the shallow undercut component is turn off and now the regular undercut component is turned on in its place by moving the switch point from 1 to 2.

Step 15.
Close out of the Point Properties dialog box. DO NOT SAVE THE ITL.

Step 16.
To view the actual expression for the display rules, click on the Active Template tab in the lower left corner of the dialog box.

Step 17.
Expand the Display Rules folder.

Step 18.
Double click on the display rule ShowSUC to view the expression. Close out of the dialog box by clicking OK.

NOTE 1: The expression reads if the absolute vertical distance difference between point RT_Sub_OEEOP and point RT_UC_Switch equals 1, then the display rule is true (turn on the shallow undercut). All other values including the default zero, the display rule is false (shallow undercut components are turned off).
NOTE 2: The two points in the expression is displayed with a highlighted arrow in the template window.

Step 19.
Double click on the display rule ShowUC to view the expression. Close out of the dialog box by clicking OK.

Step 20.
Another way to view the display rule applied to a component is to right mouse click on the shallow undercut component and select Set Component Display Rules. Choose the component RT_Shallow Undercut Out.

All of the display rule expressions are displayed in this dialog box.

Step 21.
Close out of the Component Display Conditional Expression dialog box by click on OK.

Step 21.
Close out of the Create Template dialog box by click on Close. DO NOT SAVE THE ITL WHEN PROMPTED TO DO SO. Click NO.

NOTE: Using Parametric Constraints to show undercut in Roadway Designer.

Step 22.
Launch Roadway Designer.

Step 23.
In Roadway Designer, load the b5113.ird file.

Step 24.
In the top Roadway Designer menu bar, select Tools, Parametric Constraints.

Step 25.
Enter the following settings in the Parametric Constraints dialog box. Add the parametric constraint to the list.

NOTE: Show shallow undercut from 12+60 to 14+00.

Constraint Label: UC_Type
Start Value: 1.0000
Stop Value: 1.0000
Start Station: 12+60
Stop Station: 14+00

Action: Add

Step 26.
Enter the following settings in the Parametric Constraints dialog box. Add the parametric constraint to the list and Close out of dialog box.

NOTE: Show shallow undercut from 15+00 to 16+00.

Constraint Label: UC_Type
Start Value: 2.0000
Stop Value: 2.0000
Start Station: 15+00
Stop Station: 16+00

Action: Add then Close

Step 27.
While in Roadway Designer, click Process All and verify each template drop for the two types of undercuts.

NOTE: There are other parametric constraints that can be used to controlled the undercut dimensions. UC_Depth is used to control the undercut depth (negative value) and UC_Subgrade OEOP Offset is used to control the offset distance from the subgrade outside edge of pavement for undercut.


		The North Carolina Department of Transportation