I need to create a surface model of a stretch of roadway with two roundabouts. And I do not have a Roundabout add-in or extension for InRoads. I found the following post on this in the old discussion groups, saying it can be done and with some quick words of advice.
http://discussion.bentley.com/cgi-bin/dnewsweb.exe?cmd=article&group=bentley.inroads&item=13848&utag=
Can someone expand on how best to proceed with modeling such a roundabout, or direct me to a resource that would help?
Thanks,
Brian
InRoads 08.09.02.16
Microstation 08.05.02.35
Hi Brian,
I have modeled a couple of roundabout projects with this workflow:
First I create a vertical alignment for the roads passing thru the roundabout.
Then I model them with a simple template (just a 2% slope from the center without bothering to have any end conditions) that is wide enough to overlap the entire circle, I then generate an alignment for the lip of curb for each quadrant with the surface that was generated with the wide template visualized on it. I then design a vertical profile using that surface as a guide, and then I create a template from the curb out and model that to the existing ground.
I then visualize the top surface features of the curb, sidewalk, slope intersections etc. as well as the centerline of the roads and then import those graphics as a DTM. To get the splitter islands I drape the design surface at the face of the curb and a line slightly offset for the top of the curb and then move the graphics of the top vertically with a dx=0,0,.5 command
The one problem using this method is the pavement area is a simple surface, not a component so subgrade volumes cant be computed as normal.
Dwight