Barrier2Face

This subassembly is used for to create a two-sided concrete median barrier with integral footing similar WisDOT Standard Detail Drawing 14 B 11-1 with the ability to vary the barrier dimensions.

This subassembly constructs a concrete median barrier with integral footing similar to Wisconsin DOT Standard Detail Drawing 14B 11-1.  A comparison of the elevation of the attachment point and the Right Side Marked Point determines the elevation of the bottom of the barrier, measuring down from the lower of the two points to a depth defined with input parameter Dimension F.

The barrier constructed has a controlling side, which is used to control the base depth, subbase depth and depth to subgrade, as well as the slopes that define these layers under the barrier.  There are two methods used to determine the controlling side – user specifies left or right, or the subassembly compares the elevations of the subgrade surfaces of the lanes left and right of the marked points and determines which is lowest.  The side with the lowest elevation of the subgrade depth becomes the controlling side.  If the user specifies right or left side, the elevation of the subgrade on the controlling side may not be lower than the elevation of the subgrade on the other side.  Only the base depth, subbase depth and depth to subgrade of the controlling side are used when inserting this subassembly. For example, if the controlling side is the right side, then the inputs Base Depth Right, Subbase Depth Right and Depth to Subgrade Right are used to define the base course surface below the barrier and the Base Depth Left, Subbase Depth Left, and Depth to Subgrade Left inputs are ignored.  User has the option to set a parameter reference and use the base course depths of the adjacent lanes to ensure the closure of all base course layers. 

When the Method to Determine Controlling Side for Subgrade Depth is Compare Adjacent Lanes, a computation is done to determine the subgrade elevation of the left and right side; the side with the lower subgrade elevation becomes the controlling side.  The left side subgrade elevation is computed by subtracting Depth to Subgrade Left from the Attachment Point elevation.  The right side subgrade elevation is computed by subtracting the Depth to Subgrade Rightfrom the Marked Point Right Side elevation.  Subassembly compares the left and right side subgrade elevations and assigns the lower of the 2 values as the controlling side.  A parameter reference can be set to override the input parameter values for base course, subbase, and subgrade depths with values read in from adjacent lanes. 

Depth of base layers determined as follows:

• If the controlling side is the left side the elevation of P13 – P15 is computed by subtracting Base Depth Left, Subbase Depth Left, and Depth to Subgrade Left from the attachment point elevation; the offset of P13-15 equals the attachment point offset.

• If the controlling side is the right side the elevation of P16 – P18 is computed by subtracting Base Depth Right, Subbase Depth Right, and Depth to Subgrade Right from the Right Side Marked Point elevation; the offset of P16-18 equals the Right Side Marked Point offset.

Slope of subgrade layer and base layers is determined as follows (base layers are parallel to subgrade):

• If Subgrade SE Method is Fixed Slope, slope of the subgrade layer equals Fixed Subgrade Slope.  A parameter reference can be used to override the Fixed Subgrade Slope value with one of the adjacent lanes subgrade slopes.
• If Subgrade SE Methodis Use Side Opposite of Controlling Side Inside Lane SE and the controlling side is left, the right side inside lane SE of the baseline alignment is used for Subgrade Slope.  If Subgrade SE Method is Use Side Opposite of Controlling Side Inside Lane SE and the controlling side is right, the left side inside lane SE of the baseline alignment is used for Subgrade Slope.

• If Subgrade SE Method is Use Side Opposite of Controlling Side Outside Lane SE and the controlling side is left, the right side outside lane SE of the baseline alignment is used for Subgrade Slope.  If Subgrade SE Method is Use Side Opposite of Controlling Side Outside Lane SE and the controlling side is right, the left side outside lane SE of the baseline alignment is used for Subgrade Slope.

Subgrade link is constructed as follows:

• If left side controls, P18 offset = Right Side Marked Point offset, P18 elevation = (P15 elevation)+[(Subgrade Slope)*(horizontal distance between attachment point and Right Side Marked Point)]

• If right side controls, P15 offset = attachment point offset, P15 elevation = (P18 elevation)+[(Subgrade Slope)*(horizontal distance between attachment point and Right Side Marked Point)]

The elevation of the subbase layer point on the controlling side is determined by subtracting the Subbase Depth Left (or Right) from the attachment point elevation or Marked Point Right Side elevation.  The non-controlling side subbase layer point elevation is determined by projecting from the controlling side subbase layer point across the width of the barrier, at the subgrade slope.  If the controlling side subbase point is above the bottom of the barrier link the subbase link connecting subbase points is not created, see coding diagrams.

The elevation of the base layer point on the controlling side is determined by subtracting the Base Depth Left (or Right) from the attachment point elevation or Marked Point Right Side elevation.  The non-controlling side base layer point elevation is determined by projecting from the controlling side base layer point across the width of the barrier, at the subgrade slope.  If the controlling side base point is above the bottom of the barrier link the base link connecting base points is not created, see coding diagrams.

Locations where the subgrade surface is at a higher elevation then the bottom of the barrier itself will be displayed in the Event Viewer.

Locations where the elevation difference between the attachment point and the Right Side Marked Point exceeds the Max Elevation Difference, Between Bottom of Curb Points will be displayed in the Event Viewer.

The top width of the barrier, shown as Dimension W, is variable and depends on the other Dimension inputs and the locations of the two bottom of curb points.  (Dimension W)= [(horizontal distance between the attachment point and marked point) - (2*D + 2*E)].  If W<0, then the subassembly will create no points, links, or shapes at that station and a message will be displayed in the Event Viewer.

An additional height variable, shown as Dimension H, also is computed using the locations of the two bottom of curb points and the other Dimension inputs.  The elevation of the top of the barrier is determined by adding the Overall Barrier Height value to the elevation of the attachment point or Right Side Marked Point, whichever is higher.  If (A+B+C)<(Overall Barrier Height) then the subassembly will create a vertical link on both sides of the barrier extending upwards from points P4 and P7 to the top of barrier elevation.  If (A+B+C)>(Overall Barrier Height) then the subassembly will create no points, links, or shapes at that station and a message will be displayed in the Event Viewer.

Knowing the controlling side and the locations of the two bottom of curb points, the barrier is constructed using the dimensions provided. 

The attachment point is at the bottom of the curb point on the left side of the barrier.

In layout mode, this subassembly draws the barrier shape as specified by the Input parameters, at a location relative to the specified marked points.

Info: All dimensions are in 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
Right Side Marked Point	Specifies the name of the marked point at the bottom of the curb point on the right side of the barrier.	String	Right
Overall Barrier Height	Height of barrier, measured up from the attachment point or the Right Side Marked Point, whichever has the higher elevation.	Numeric, Positive	32 inches
Dimension A	Barrier Dimension	Numeric, positive	3 inches
Dimension B	Barrier Dimension	Numeric, positive	10 inches
Dimension C	Barrier Dimension	Numeric, positive	19 inches
Dimension D	Barrier Dimension	Numeric, positive	7 inches
Dimension E	Barrier Dimension	Numeric, positive	2 inches
Dimension F	Barrier Dimension	Numeric, positive	9 inches
Max Elevation Difference Between Bottom of Curb Points	Maximum allowable elevation difference between the attachment point and the Right Side marked Point.	Numeric, positive	15 inches
Method to Determine Controlling Side for Subgrade Depth	User can input the side (Left or Right) that is used to control the subgrade depth beneath the barrier or elect to have the subassembly make the determination using the adjacent lanes' subgrade depths.  When electing to compare the adjacent lanes' subgrade depths, the subgrade depth with the lowest elevation is then set to be the controlling side.  The controlling side depths are used to define base depth, subbase depth and depth to subgrade.	String, Combo List of Options:  a.) Right, b.) Left, c.) Compare Adjacent Lanes	Compare Adjacent Lanes
Base Depth Left	Distance from the bottom of the curb portion of the barrier to the bottom of the first base course layer of the lane adjacent to the barrier – left side.  User also has the option to set a parameter reference and use the Base Depth of an adjacent lane to define the base depth under the barrier.  If there is no base course layer a 0 depth should be used.	Numeric	0 ft.
Base Depth Right	Distance from the bottom of the curb portion of the barrier to the bottom of the first base course layer of the lane adjacent to the barrier – right side.  User also has the option to set a parameter reference and use the Base Depth of an adjacent lane to define the base depth under the barrier.  If there is no base course layer a 0 depth should be used.	Numeric	0 ft.
Subbase Depth Left	Distance from the bottom of the curb portion of the barrier to the bottom of the second base course layer of the lane adjacent to the barrier – left side.  User also has the option to set a parameter reference and use the Subbase Depth of an adjacent lane to define the subbase depth under the barrier.  If there is no second base course layer a 0 depth should be used.	Numeric	0 ft.
Subbase Depth Right	Distance from the bottom of the curb portion of the barrier to the bottom of the second base course layer of the lane adjacent to the barrier – right side.  User also has the option to set a parameter reference and use the Subbase Depth of an adjacent lane to define the subbase depth under the barrier.  If there is no second base course layer a 0 depth should be used.	Numeric	0 ft.
Depth to Subgrade Left	Distance from the bottom of the curb portion of the barrier to the subgrade surface of the lane adjacent to the barrier – left side.  User also has the option to set a parameter reference and use the Depth to subgrade of an adjacent lane to define the depth to subgrade under the barrier.	Numeric	2 ft.
Depth to Subgrade Right	Distance from the bottom of the curb portion of the barrier to the subgrade surface of the lane adjacent to the barrier – right side.  User also has the option to set a parameter reference and use the Depth to subgrade of an adjacent lane to define the depth to subgrade under the barrier.	Numeric	2 ft.
Subgrade SE Method	Selects whether to use the superelevation slope for the subgrade surface or to set a fixed slope value.  User also has the option to set a parameter reference and use the Subgrade Slope of an adjacent lane to define the subgrade slopes under the barrier.	Selection List:  a.) Use Side Opposite of Controlling Side Inside Lane SE, b.) Use Side Opposite of Controlling Side Outside Lane SE, c.) Fixed Slope	Fixed Slope
Fixed Subgrade Slope	Default cross slope of the subgrade surface left of the baseline. This value is used if superelevation slope is not used, or is not specified for the baseline alignment.	Slope	-0.02

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Point/Link/Shape	Codes	Description
P1-P12	P1-P12
P13	ETW_Base1_Bar_LT	Edge of traveled way at bottom of first base course layer left side of barrier.
P14	ETW_Base2_Bar_LT	Edge of traveled way at bottom of second base course layer left side of barrier.
P15	ETW_Sub_Bar_LT	Edge of traveled way at the top of the subgrade layer left side of barrier.
P16	ETW_Base1_Bar_RT	Edge of traveled way at bottom of first base course layer right side of barrier.
P17	ETW_Base2_Bar_RT	Edge of traveled way at bottom of second base course layer right side of barrier.
P18	ETW_Sub_Bar_RT	Edge of traveled way at the top of the subgrade layer right side of barrier.
L1-L9	Barrier
L2-L7	Top
L10	Base1	Top of the second base course layer.
L11	Base2	Top of the subbase layer.
L12	Datum, Subbase SUBG	Top of the Subgrade or FINGRND
L13	Datum, Subbase SUBG	Top of the Subgrade or FINGRND
S1	Base1
S2	Base2
S3	Subbase
S4	Barrier