NCDOT Roadway Design Unit:

Excercise Data:

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

Dowload dataset here... 9_Resurf_Grade.zip (1,004 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:

09_Setting_Resurfacing_Grades_with_Roadway_Designer_Overlay_Tools.pdf
B5113.rdp
B5113_Rdy_cmd.dgn
B5113_rdy_dsn.dgn
B5113_rdy_eop.dgn
B5113_rdy_pfl.dgn
jobrdy.gpk
B5113.ird
B5113.itl
B5113_Ex.dtm
cmjobRDY.alg
cmjobRDY.xml

Excercise: Set Resurfacing Grade

A general workflow for using the Overlay Tools to set a resurfacing grade involves the following:

Import (from GPK) the horizontal alignment only into the Corridor Modeler Geometry dialog box (no profile).
Store the existing edge of pavement (EEOP) lines in the Corridor Modeler Plan Graphics dialog box.
Create a new corridor in Roadway Designer with just the horizontal alignment (no profile).
Use the simple Overlay BBO- 1 template to initially set the resurfacing grade.
Use the Overlay Tools to generate a best fit VPI only profile (Cross Slope Optimization, Vertical Adjustment Settings, Smooth Adjusted Vertical Alignment, Apply Adjusted Vertical Alignment).
Export the adjusted VPI only profile to GPK.
Use the Geopak Profile Generator (with top and bottom envelopes as a guide) to tweak and finalize the proposed resurfacing grade.
Re-import final resurfacing grade back to Corridor Modeler Geometry.
Apply the final resurfacing grade to the corridor.
Switch the simple Overlay BBO- 1 template with the desired complete template(s).

Step 1.
While in the file B5113_Rdy_cmd.dgn, launch Corridor Modeler.

Step 2.
Load the file b5113.rdp.

Step 3.
Load the file jobrdy.gpk.

Step 4.
Launch Roadway Designer.

Step 5.
Load the file b5113.ird.

Step 6.
In the lower right corner, change the Display Mode to Overlay.

Step 7.
Select Cross Slope Optimization from the Overlay Tools menu item.

NOTE: Before beginning cross slope optimization, consider if the proposed superelvation rates have already been calculated. If the super has already been calculated, then import the shape input file first. If the super has not been calculated, the CSO tool will help with the design or match the existing slope. The right side and left side of the road should be done in two separate processes.

Left Side Parameters

Existing Type: Alignment
Pivot Alignment: L
Superelevated Alignment: LT_L_OEEOP

Design Type: Constant
Design Slope: -2.00%

Slope Tolerance: 0.00%
Elevation Tolerance: unchecked
Maximum Desirable Delta G: 1.000

Station: unchecked

Section Name: L_SE
Control Line Name: LT_L_SE
(Pivot: PV1_PGL, Superelevated Point: LT_PV1_OEOT)

Right Side Parameters

Existing Type: Alignment
Pivot Alignment: L
Superelevated Alignment: RT_L_OEEOP

Design Type: Constant
Design Slope: -2.00%

Slope Tolerance: 0.00%
Elevation Tolerance: unchecked
Maximum Desirable Delta G: 1.000

Station: unchecked

Section Name: L_SE
Control Line Name: RT_L_SE
(Pivot: PV1_PGL, Superelevated Point: RT_PV1_OEOT)

NOTE: The existing ground cross slopes matches the corrected cross slopes.

Step 8.
Select Vertical Adjustment Settings.

Vertical Adjustment Settings Parameters

Backbone Thickness: 0.2083 (2.5")
Use Minimum Overlay: 0.0000
Use Minimum Milling: unchecked
Use Maximum Milling: unchecked

Template Range
     Left Point: LT_PV1_OEOT
     Right Point: RT_PV1_OEOT

Station: unchecked

Existing Ground Range
      Type: Match Template Range

Solution Option
     Examine all Cross Section Points: checked
     Examine Template Points Only: unchecked
     Maximum Vertical Difference: 0.0000

NOTE: Remember to "Process All" after selecting the OK button to close the VAS dialog.

Step 9.
Select Smooth Adjusted Vertical Alignment.

Smooth Adjusted Vertical Alignment Parameters

Tolerance: 1.0000
Create Linear Elements Only: checked
Vertical Alignment Name: L_PRO

Step 10.
Select Apply Adjusted Vertical Alignment.

Apply Adjusted Vertical Alignment Parameters

Apply Adjusted Vertical Alignment to Corridor: checked
Style : F_PFL Best Fit

Create Vertical Alignment

Bottom Envelope: checked
Name: L_BOT_ENV
Style: F_PFL Bot Envelope

Top Envelope: checked
Name: L_TOP_ENV
Style: F_PFL Top Envelope

Step 11.
Export Profiles to GPK

Horizontal: L

Vertical Alignment: L_BOT_ENV
Vertical Alignment: L_PRO
Vertical Alignment: L_TOP_ENV

Step 12.
Tweek and Finalize Resurfacing Grade with Geopak Profile Generator

While in file b5113_rdy_pfl.dgn, launch the Profile Generator (Applications > GEOPAK > ROAD > Geometry > Layout Profiles (VPI Based) and use the green profile that has already been placed. Note the top and bottom envelopes have already been drawn in along with the existing ground profile. Load the profile L_PRO and input these vertical curve data. Re-save L_PRO with the new grade.

VPI 1 Sta 12+60 El 306.86
VPI 2 Sta 13+50 El 303.17 L 180
VPI 3 Sta 15+80 El 304.80 L 160
VPI 4 Sta 16+65 El 307.55

Step 13.
Re-import Finalized Resurfacing Grade back to Corridor Modeling Geometry

Step 14.
Switch simple Overlay template with the Complete Full Template

Initially, the simple Overlay BBO-1 template was used to determined a resurfacing grade. Once the resurfacing grade has been finalized, the simple Overlay template should be switched with the desired complete template. To ensure a seamless switch from one template to another with respect to the optimized cross slopes, the key point names (PV1_PGL, RT_OEEOT, LT_OEEOT, etc.) are identical between the two templates.