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Superelevation Transition zone

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Message 1 of 3
paulof
414 Views, 2 Replies

Superelevation Transition zone

Hi guys.

I have a problem on my civil 3D 2015:

When i calculate superelevation, using "_Autodesk Civil 3D Metric (2011) Roadway Design Standards.xml" file, on clothoid (transition zone before maximum value on circular curve) slopes are not equal on left and right. Why this happens?

 

paulof
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Message 2 of 3
sboon
in reply to: paulof

We need more information to be able to help.  What settings are you using in the Superelevation Wizard?  Are you looking as slopes in the tabular editor, or on your road cross sections?

 

Steve
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Steve
Expert Elite Alumnus
Message 3 of 3
paulof
in reply to: sboon

Hi.

Here the settings:

Undivided Crown

Pivot Method:Right side

Symmetric roadway

Outside Edge shoulders:Calculate:

Shoulder slope treatment:Low side:

Match lane slopes

High side:Match lane slopes

Design criteria:_Autodesk Civil 3D Metric (2011) Roadway Design Standards.xml

Superelevation rate table:AASHTO 2011 metric 8%

Transition lenght~table:2 lane

Attainment method:AASHTO 2011...

Apply curve smoothing and  automatically resolve overlap

 

The big problem is that:

Transition in region, End Normal Crown and Level Crown (Runout) must come before clothoid zone and it dont.

On runoff:

Begin full super and begin curve is correct, but Reverse Crown dont. Reverse Crown starts along clothoid and it must start on clothoid begin.

If we have Crown (2 lane 2.5%), one side must start rotate before clothoid (+- 25m), and the 2 sides must rotate (symmetric) along clothoid (error).

Along circular curve 2 sides rotate on maximum value (correct).

paulof

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