AutoCAD Civil 3D :: Transitional Lanes And Link Slope To Surface
Aug 4, 2012
I am having trouble getting my assembly to work in my corridor. I have a Basic Lane Transition subassembly with a Link Slope to Surface subassembly attached to it. The assembly follows my centerline alignment and the lane widens as designed out to my offset alignments. The slope grading to daylight works fine until the transitional lane starts to widen, then the slope assembly stays at the same point on the lane and does not stay linked to the end of the lane.
I am also having trouble getting the subassemblies to attach to the proper points. I keep trying different OSnaps unitl one seems to work, but I am never sure the subassemblies are connected properly.
in my link "link slope to surface", i have the slope set to -2.00%. in the cross sections, it is at a +2.00%. why is this thing not linking at the defined -2%? see image.
I am re-routing a small stream. I am using generic links for the bed and side slope. I whant the side slope to be 3:1 and project beyond the existing culvert wall in the eg model. can this be done easily?
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I haven't had to use a generic link slope in a while, but I'm baffled as to why this isn't working for me. Below is my assembly which looks looks fine, but the corridor is doing the opposite of what it should be doing.
And here is what the corridor is doing.
My grass strip link is going in the opposite direction and it's much longer than 7 feet. Am I missing something or is this another bug?
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Its a embankment crest (dam wall) and then sloping down at an angle to a target elevation. I want it to shoot through my topo / surface and then apply a boundary later.
It looks fine in Composer but doesn't show up in C3D - only straight line. Would like the same outcome as the Generic Link Code - LinkSlopetoElevation.
I have a question regarding a transitional constraint between a pin and a surface within an adaptive assembly.
I would like the pin and the surface to be transitional only when the two parts "interfere" with each other.
At the moment with the example attached part A is remaining tangent to part B, restricting the necessary movement of part B to function properly in the mechanism.
In simplified terms I need part B to be able to break free of the "transitional constraint" of part A under certain movement conditions within the mechanism.
Please find the attached picture. It shows a surface with its data points. I extended the surface to the outer boarder shown by kriging. The slope of the surface that was added with the extension (past the data points) has an upward slope that was generated. I need the surface to stay level with the data points that are there.
How to avoid that added slope when extending a surface?
I'm modeling a simple corridor (12' lane 2%, 6' shoulder 6%, 4:1 to match EG). I used the "LinkSlopeToSurface" subassembly for the 4:1 to match the EG. Unfortunately our EG isn't always wide enough for the 4:1 slope to match it somewhere.
Is there an assembly that would use 4:1 as a standard daylight slope, but where necessary adjust the slope, max. 3.5:1, to match EG surface?
I am using AutoCAD Civil 3D to do a slope analysis across project locations. When defining slope categories, I am finding that the max slope percentages are astronomically high; ranges are being returned up to 360,000%--and I've only done three regions! I understand vertical slope but these percentages are not realistic by any means, especially through the areas in which I am working.
A specific example: between a contour at elevation of 792 ft and a contour at elevation of 794 ft at a distance of approximately 60 feet, the slope percentage being returned is in the 9000% range. There is not a sudden drop or rapid change in elevation between these two contour intervals to provide reason for this high of a percentage. I would expect to have a slope percentage nearer the 3% range.
The data source of the contour information is LiDAR being brought into CAD via the task-based geospatial option using MapImport. All data tables are being kept. Polygons are being imported as closed polygons. There are no surface errors being reported upon creation. The project locations were created in another program and imported into CAD using the same manner. The only thing that I can conjure up is that there is some sort setting issue.
I change my surface style to slope banding (3 ranges) and make a legend table.All of the three ranges in the table are red and my surface ranges are blue, yellow, & red.
I am trying to create grading slope from a Feature line that was created at a constant elevation of 609m. I want to create a slope of 3:1 from the feature line to a surface I created. I recall in AutoCAD Civil 3D 2011 that you could create a slope directly to a surface. Is there a way of doing that in 2014 or did I simply forget a step when I created my Grading Groups?
I created the grading group using the Grading Creation Tool Pallet and selecting Set Grading Group. Then I set my target surface to the one I want to grade towards. I thought all I had to do than was go to Create Grading select the direction of grading and the slope. I thought the slope would continue to the target surface but it asked for a distance for grade that would throw off any volumes I want to pull off.
Did I have to create a new surface for my Pad at 609m than grade from that and how would I make sure my slope continues till it contacting the surface I want to target?
Am I correct in assuming that if Surface Labels by One Point is chosen, the slope as shown is the maximum slope of the surface triangle where the point was chosen??
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I have surface percent slopes labels in my drawing. I want to change the current style precision to only one decimal not three and I don't want to see the negative in front of the slope value.
On my corridor I am using Link Slope to Surface, using a 3:1 slope. But it is giving me a 3:1 slope radial to the corridor - what I really need is a 3:1 slope between the contours themselves. On the inside of a tight curve, this makes a big difference. See the attached screenshot. Is there a workaround for this?
I am trying to draw an alignment for a road. I want the alignment to represent the outside of the curve as the road climbs up and around a mound. Is there not way to do this in Civil 3D?
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and now I am thinking I will have to do this manually, extract contours, and trim/extend my way to victory...I really would like to have this in a dynamic situation so I can make adjustments. Also, it would be adventageous to have the line actually follow the grade so I dont have to add curves in etc later...
I'm trying to suppress trailing zeros in a surface slope label in run:rise format. Basically, if it's a 2 to 1 slope, I want it to read 2:1 or if it's a 2.5 to 1 to read as 2.5:1.
I found this blog showing how to do it for line slopes, but I think it's not able to work using the run:rise format.
I use Civil 3D 2011 and I am new to it. I have created a natural ground surface from survey points. Now i want to create a finished surface with a specific slope in a specific direction at a specific elevation and then to calculate cut and fill volume.
I can create a flat surface at a specific elevation. How to tilt this surface to a specific slope along a specific direction.
I am looking for grading utility in autocad civil 3d. So, i need to smooth my projection slope to target the surface without projection steps. The objective is to correct a surface to implant photovoltaic structures.
When I use link offset to surface and attach on left side, still extend to right. I am targeting a slope stake line polyline that exists on both sides of the roadway, works fine on right side. Documentation indicates that a negative offset value is needed to use to the left. How do I use negative value and target a polyline?
I think this should be an easy thing to do, but I am having problems figuring it out. I need to repath the location of a point file being used in a surface. My surface will not rebuild because it can't find the point file originally used. Drawing was used on a different computer system, so the point file directory is now pointed to the wrong path.
I just tried to create a subgrade surface using the base link. The surface turned out to be wrong because some of the points in the Lane Outside Super Layer Varying Width subassembly are uncoded. Everything I've looked at seems to be programming related (over my head). Do I need to download a composer for 2014? I didn't see one on the list for 2014.
I am trying to create a surface rise:run slope label for our company template file. I have it set using the default values that I want. But right now the text is just 1:1...where we want it to read 1V:1H.
how I can keep the label dynamic to the surface, but put the V & H in the label after the values.?
I am modelling a steep channel of constant slope operating under super critical flow conditions between two small weirs. I have set up two different models to represent this:
1. A single link between the upstream and downstream weirs. 2. I have also modeled the channel as a number of smaller links with the same slope separated by nodes spaced arbitrarily along the channel length.
The two models give very different results. The former results in an unstable channel (oscillates between sub- and super critical flow) and a maximum velocity in the channel of around 1.5m/s. It seems to me that the velocity in the upper section of the channel should be higher. I assume this has something to do with the manner in which SSA averages the velocities along the entire channel link.
The second model gives more realistic velocities in the upper channel links (around 3.6m/s) and a hydraulic jump and transition to sub critical flow upstream of the weir in the lower channel. This seems more realistic. I think the trick here is to make sure that the downstream link is long enough to enable realistic formation of the hydraulic jump in the model.
Can you not perform a slope-slope intercept to place a PVI? Essentially holding the sta and elev of the PVI's directly before and after the PVI of interest and changing the grade in and out so that the sta and elev of the PVI of interest are changed.
