This subassembly creates a cross-sectional representation of finish grade, pavement, and subbase for urban, parabolic lanes between the left and right edges of traveled way.
The parabolic shape is simulated by a series of short, straight-line links. No superelevation is applied to the travel lanes. The pavement structure follows the standards described in “Pavement Structure on Paved Sections” in the Autodesk Civil 3D Help.
Attachment
The attachment point is at the crown of road on the finish grade surface. This component is symmetrical about the attachment point.
Input Parameters
Note: All dimensions are in meters or feet unless otherwise noted. All slopes are in run-over-rise form (for example, 4 : 1) unless indicated as a percent slope with a “%” sign.
|
Parameter |
Description |
Type |
Default |
|---|---|---|---|
|
Crown Height |
Height from the center point of the string line to the crown of road |
Numeric, positive |
0.10 m 0.3333 ft. |
|
Width |
Width of the roadway from the left edge-of-traveled-way to the right edge-of-traveled-way |
Numeric, positive |
7.2 m 24.0 ft |
|
Pave1 Depth |
Depth between the finish grade and the Pave1 surface (zero to omit) |
Numeric, non-negative |
0.025 m 0.083 ft |
|
Pave2 Depth |
Depth between the Pave1 and Pave2 surfaces (zero to omit) |
Numeric, non-negative |
0.025 m 0.083 ft |
|
Base Depth |
Depth between the Pave2 and Base surfaces (zero to omit) |
Numeric, non-negative |
0.100 m 0.333 ft |
|
Subbase Depth |
Depth between the Base and Subbase surfaces (zero to omit) |
Numeric, non-negative |
0.300 m 1.0 ft |
|
%Slope |
% slope of the string line from the left ETW to the right ETW |
Numeric |
0 (%) |
|
No. Increments |
Number of straight line increments simulating the parabolic shape |
Numeric, positive, even |
8 |
Target Parameters
This section lists the parameters in this subassembly that can be mapped to one or more target objects. For more information, see To Specify Corridor Targets.
Target Parameters: None.
Output Parameters
None.
Behavior
The center of the string line is calculated by subtracting the Crown Height from the attachment point, and the left and right edges-of-traveled-way are calculated by applying the Width and Slope symmetrically about the attachment point. The ordinates of the parabolic curve are calculated at even intervals along the string line, and straight line links are added to connect the ordinate points. Parallel surfaces are inserted for the Pave1, Pave2, Base, and Subbase surfaces from the given depths.
Layout Mode Operation
In layout mode, this subassembly displays the lane links calculated from the given input parameters.
Point, Link, and Shape Codes
The following table lists the point, link, and shape codes for this subassembly that have codes assigned to them. Point, link, or shape codes for this subassembly that do not have codes assigned are not included in this table.
|
Point, Link, or Shape |
Code |
Description |
|---|---|---|
|
ETW |
Outside edges of lane on finish grade |
|
|
ETW_Pave1 |
Outside edges of lane on the Base surface |
|
|
ETW_Pave2 |
Outside edges of lane on subbase |
|
|
Crown |
Crown point on finish grade |
|
|
Crown_Pave1 |
Crown point on Pave1 |
|
|
Crown_Pave2 |
Crown point on Pave2 |
|
|
Crown_Base |
Crown point on Base |
|
|
Crown_Sub |
Crown point on subbase |
|
|
Top Pave |
Finish grade |
|
|
Pave1 |
Pave1 surface |
|
|
Pave2 |
Pave2 surface |
|
|
Base |
Base surface |
|
|
SubBase Datum |
Subbase surface |
|
|
S1 |
Pave1 |
Area between finish grade and Pave1 |
|
S2 |
Pave2 |
Area between Pave1 and Pave2 |
|
S3 |
Base |
Area between Pave2 and Base |
|
S4 |
SubBase |
Area between Base and Subbase |
Coding Diagram
