Modeling a Sidewalk Ramp in Civil 3D using Feature Lines

in this session we'll look at a way to use feature lines to model a sidewalk ramp now I've got a drawing open on my screen let's take a quick tour this geometry represents a model of a proposed parking lot design in fact let me select my top surface I'll choose object viewer and we can orbit this around as you can see the majority of the parking lot has been modeled I am currently working on the sidewalks and part of the sidewalks is modeling these pedestrian crossings I've got one more to do and I thought we could do this one together so I could show you a technique that I use when I'm working with feature lines I'm gonna close the object viewer and I'll press escape we'll pan this over the sidewalk we'll be working with is right here now if we look to the right this is areas viewing the same location in the model it's just in 3d and it also has some shading on the surface let's look at what I've done so far I have created a series of featured lines this one represents my top back of curb right here we've got the face of curb there's the flow line of the gutter and here's the edge of pavement let me press escape so i defined those feature lines in 3d and then i added those to my top surface as brake lines let's hover over this contour we can see the name of that top services p lot let me mention one more thing i'm going to select a couple of these feature lines and we'll go over to the properties palette i just want to show you that i've placed these feature lines in a site called p lot curb and gutter we'll come back to that in just a little bit note that we have this green geometry this is what's defining my sidewalk these are poly lines these are left over from the original conceptual plan these are at elevations 0 let's zoom in one more time you can see the area where the sidewalk crosses to curb we can see that the geometry terminates here at the flow line of the gutter so this is where i'm sloping down to that lowest point let's pan over when it comes to the flanges we can see these terminate at the face of curb which is the highest point at the front edge of the curb so generally speaking we'll be creating a nice taper down from this edge to this one let's zoom out since these objects are polylines I'm going to start by joining them together I'll do that by opening the modify menu while she was joined and I'll select these entities that define the left and right edges of the sidewalk and I'll press ENTER this gives me nice continuous polylines I will now convert these entities into feature lines we'll do that by opening the feature line menu and I'll choose create feature lines from objects I will select the left and right edge and I'll press Enter I'm not going to put them in a site just yet we will name them though I'll call them P walk south and then since I have more than one let's open the name template and we will add a counter so we'll have P walk south one and two for the left and right edge I'll click OK I'm gonna keep the default style here I'm going to erase the existing entities and I'm going to assign elevations let me click OK I'd like to assign the elevations from the proposed Lots surface and I'd like to insert intermediate grade breakpoints let's click OK as you can see these objects have been projected up the same as if they were spray-painted on the surface basically I'm going to be using these feature lines to lock these edges such that I can push this area of the surface down I'm going to press escape to deselect let me zoom in I'm going to select the top back of curb now when I press this down I want to have a nice bend here at this point in order to have a bend I need to have a grip so let's back up what we'll do is select the left and right edge of the sidewalk here and I'll choose move to site I'm going to move these feature lines into the same site as the other feature lines let me click OK I'll press escape having done that if I select this feature line for instance and come up to the elevation editor we'll find that there has been a calculated point placed at this intersection and that is consistent for both sides so with respect to this feature line the elevation at the intersection is being driven by this feature line that's what's going to create my Bend let's close the panorama I'll press escape to deselect I will then select these two edges and we will add them as brake lines to our proposed service I'm not going to give them a description these will be standard brake lines they're 3d I don't need to worry about the weeding or the supplementing factors I'll come down and click OK let's press escape as you can see the surface is now triangulating to these edges finally we'll create the lowering I'll do that by creating feature lines from these objects let's open the feature lines menu I'll choose great feature lines from objects I will select each of these and I'll press Enter we won't put them in a site just yet for name we'll call this P walk South lowering and since we have more than one will open the name template and we'll insert a counter keep the same settings we had before I'd like to assign the elevations let me click OK I'd like to pull the elevations from the proposed surface except this time I don't want to have the intermediate points I'll click OK by doing that it only assigned elevations at the endpoints which is perfect because this endpoint is at the lowest point of the curb and gutter we can see that right here and this endpoint matches up with the edge of the sidewalk we can see that right there that's consistent on both sides next we will add each of these objects to the same site as the other feature lights I'll click okay finally we'll rebuild the surface I'll go to the prospector tab and we'll find that surface I'll right click and I'll choose rebuild I'll press escape to deselect we'll come over this view and we can see the ramp there let's orbit this a little bit just for a second I am going to hide the surface I'll do that by going to the layers panel I'll choose freeze and I'll select my surface let's come over here to the view on the right we'll get a better idea of what's going on I'm going to select my sidewalk feature lines and momentarily we'll move them into the none site and I'll click OK notice how my curb and gutter comes back up these objects are still selected let's go to move to site I'm going to put them back in the same site as the other feature lines and I'll click OK and you can see it's now getting pulled down when feature lines are in the same site they interact they intersect at a common elevation that elevation is dictated by whichever feature line was edited last in this case those feature lines define my sidewalk geometry let's put things back the way they were I'll do that by opening the layers panel and I'll click layer previous to bring back my surface so the next time you're modeling some proposed sidewalk try using this technique by leveraging the power of feature lines you can make quick work of pedestrian ramps would you like to explore other Autodesk infrastructure ideas and workflows if so please visit the civil immersion blog by scanning the QR code or by following the URL listed below

Channel: Jeff Bartels

Views: 44,556

Keywords: Bartels, akn_include, Autodesk, Civil 3D, sidewalk, ramp, ada, pedestrian, crossing, lowering, handicap, tutorial, advanced, train

Id: 7m2zHHDejZA

Length: 7min 1sec (421 seconds)

Published: Sat Nov 05 2016