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High point station

6 REPLIES 6
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Message 1 of 7
Anonymous
337 Views, 6 Replies

High point station

I am trying to determine the High Point Station of a vertical curve. I can
find the PVI that the vertical curve is located at and can even get the
elevation of the finished ground at the PVI point (either the PVI elevation
or the actual FG elevation) but what I need to be able to do is find the
actual station. Once I have the station the elevation is easy. Does anyone
have any ideas. I have looked through the help files but cannot find
anything on this. I really would have thought that a vertical curve would be
an object of some type.
6 REPLIES 6
Message 2 of 7
qdesigns
in reply to: Anonymous

If you import the FG vertical alignment into your profile, it does tell you the high or low pvi elevation & station. However if you are doing a vertical curve between to tangents with both a negative or a positive slope in the same direction then there is no such thing as a high or low pvi.
Message 3 of 7
Anonymous
in reply to: Anonymous

I am labeling plan view with elevations at selected
increments along a centerline, as well as labeling all the high and low points.
When a vertical curve is involved I need to get the actual station and
elevation that is the high point (or low point) of the vertical curve and
not the actual PVI elevation. In the case  of a vertical curve between two
tangents that are both positive or negative, the elevation can just be at the
actual PVI (.ElevationAt works fine for this).


style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
If
you import the FG vertical alignment into your profile, it does tell you the
high or low pvi elevation & station. However if you are doing a vertical
curve between to tangents with both a negative or a positive slope in the same
direction then there is no such thing as a high or low
pvi.
Message 4 of 7
Anonymous
in reply to: Anonymous

Tim,

You can get the curve length from the PVI object. With the station/elevation
of the PVI compared to the previous and next PVI's you can calculate the
grades in and out of the curve. With that you can calc the high/low point.

You will want to verify the formula (it's been a while since I needed it)
but if I remember correcly the high/low point is calculated as

Distance from start = ((grade in) * (curve length)) / (grade in - grade
out).

Glen
Message 5 of 7
Anonymous
in reply to: Anonymous

Tim, when you import your fg profile select yes when promted to label vertical curves and the sta and elevation of low / high points will be plotted for you.
Message 6 of 7
Anonymous
in reply to: Anonymous

True, but I am trying to place the HP/LP stations
on the plan view, not the profile. I finally found a formula for calculating the
HP/LP station of the vertical curve.


style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
Tim,
when you import your fg profile select yes when promted to label vertical
curves and the sta and elevation of low / high points will be plotted for
you.
Message 7 of 7
robert.steltman
in reply to: Anonymous

There is a routine in Profile Tools, Profile to Plan, that will place elevations at user selected interval and place additional blocks at the alignent critical stations and even flag the BVC, EVC and high or low point. Profile Tools is part of the Road Tools suite of routine that enhances Civil/Design for Road Designers. Download the FREE 30 day fully functioning evaluation version http://www.rsteltman.com/

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Steltman Software Solutions
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Toll Free 1.866.260.2514 tel 1.905.945.9620 Fax: 1.905.945.6549
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