Join Jeff Bartels for an in-depth discussion in this video Introducing assemblies, part of Civil 3D Essential Training.
- The first step in roadway modeling is to create an assembly, much like the one I have on screen. Assemblies represent a typical section. They also contain a great deal of intelligence that can be used to annotate, analyze, or render a corridor model. In this session, we'll take our first look at assemblies. On my screen, I have an example of an assembly. Let me zoom in a little bit closer. This assembly represents a typical section for a roadway design. Now, the assembly itself is actually this vertical red line. In fact, if I hover over this, it'll tell us it's an assembly.
Typically, the assembly is placed at the crown of the road, although it doesn't have to be. To the left and right of the assembly, I have a collection of roadway parts. Let me zoom in a little bit closer. Here I have a lane, where here I have a curb and gutter. I've got a sidewalk with some sod to the left and right, and then down here on the end, I have some instructions for daylighting back to my existing surface. What I'd like to do in this session is take a look at some of the underlying components of an assembly. Let's zoom in. An assembly is made up of three different parts: points, links, and shapes.
The points are represented by these small rings. From a programming perspective, the points are coded. Let me hover over this point. I can see it's got the code Flowline_Gutter. Let's hover over this point. This one has the code ETW, Edge of Traveled Way. By coding these points, it makes it very easy later when I'd like to label my cross-sections. After I've built my road model and generated sections, I can tell Civil 3D, I'd like you to label all of the edges pavement locations. I'd like you to label all of the flowline locations.
Since those points are known, Civil 3D knows exactly where to place the labels. Let's zoom back in. These points are also used to develop the longitudinal geometry of my roadway. You see, to build my roadway model, Civil 3D's going to copy this assembly multiple times along my alignment and profile. Each time it places a new assembly, it's going to play connect the dots with these points. So when it's finished, I'll have a long, three-dimensional line string that represents my edge of pavement. I'll have a three-dimensional line string that represents my flowline, or top of curb, and so on.
The next assembly component I'd like to talk about are links. A link is a connection between two points. The links are also coded. Let me hover over this link. We can see it utilizes the codes Top and Curb. It can have more than one code. Let's pan this over, and I'll zoom out. We'll hover over this link. This one is called Pave and Top. Links can also be used for labeling. After creating my cross-sections, I can tell Civil 3D, I'd like you to label all of the pavement grades.
All that has to do is find any link that's called Pave, and apply a label to it, much like this one. These links are also used to build surfaces. After I build my corridor model, I can tell Civil 3D to find any link that contains the code Top, and use it to build a surface. These links are also used for rendering purposes. Let me hover over this one. I can see this one contains the code Sod. I can tell Civil 3D, in the event I ever render my corridor model, I would like all of the areas created by links called Sod to look like grass.
So, we've talked about points, links, finally we'll talk about shapes. A shape is any place where we have three or more links creating a closed area. Shapes can also be annotated. In this case, I don't have any shape annotations. I have added a hatch, though. If I hover over this hatch, I can see the shape code is called Sidewalk. Shapes are used to pull material quantities. If you've ever extracted material quantities manually from cross-sections, you know that you have to go through and trace each shape, curb and gutter, pavements, sidewalk.
Once you've found the area of each shape, then you'll calculate the average end area to the next section to find the volumes. Well, we don't have to do that anymore. Since these shapes are already defined and named, Civil 3D knows what the areas are and it can pull the material quantities for us. After generating my cross sections, I can simply tell Civil 3D to extract the sidewalk quantities, and it'll do it for me automatically. I'm going to double click the mouse wheel to do a zoom extents. So, assemblies represent the building blocks used to create a 3D roadway model.
By leveraging the underlying points, links, and shapes, we have a powerful means of annotating, analyzing, and visualing a design. In our next lesson, we'll learn how to build an assembly similar to the one we see on screen.
- Exploring the design data in drawings
- Creating, connecting, and grouping points
- Customizing label styles
- Defining existing ground surfaces
- Designing horizontal alignments
- Controlling alignment properties
- Creating profiles and profile views
- Sharing design data
- Creating and managing parcels
- Building assemblies
- Modeling advanced roadways
- Defining gravity-based pipe and pressure pipe networks
- Creating sections and section views
- Analyzing designs
- Generating plan sheets
Skill Level Intermediate
AutoCAD 2015 Essential Trainingwith Scott Onstott8h 35m Beginner
AutoCAD: Tips, Tricks, and Industry Secretswith Jeff Bartels3h 48m Intermediate
Up and Running with Civil 3Dwith Jon Michael Roberts2h 31m Beginner
Basic Roadway Design with Civil 3Dwith Eric Chappell2h 47m Beginner
1. Laying the Foundation
2. Creating and Managing Points
3. Defining Existing Ground Surfaces
4. Designing Horizontal Alignments
5. Creating Profiles and Profile Views
6. Sharing Design Data between Drawings
7. Creating and Managing Parcels
8. Creating Basic Roadway Models
9. Exploring Advanced Roadway Modeling Concepts
10. Modeling Gravity-Based Pipe Networks
11. Modeling Pressure Pipe Networks
12. Managing Sample Lines
13. Creating Sections and Section Views
14. Exploring Grading Tools
15. Analyzing Designs
Using the Inquiry Tool6m 7s
16. Generating Plan Sheets
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