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NOTES Module 16 Roadway Assemblies and Corridors In this module, you learn how to work with roadway assemblies and corridors in AutoCAD Civil 3D. Objectives After completing this module, you will be able to:  Navigate the Subassembly Catalog.  Add subassemblies to a tool palette and modify subassembly properties.  Create an assembly and modify the assembly properties.  Create a corridor.  Modify the corridor properties.  Create a corridor surface.  Prepare a 3D model of the finished road design.AutoCAD Civil 3D 2009 Education Curriculum NOTES 16-2 Notes to Instructor Data for this module resides in the \AutoCAD Civil 3D 2009 Education Curriculum\Module 16 - Roadway Assemblies and Corridors\ folder. Exercises The following exercises are provided in step-by-step format. Open the AutoCAD Civil 3D program prior to beginning the lesson by double-clicking the Civil 3D icon on the desktop. Those working in the imperial system should use the drawing files beginning with the letter I, while those working in the metric system should use the drawing files beginning with the letter M. A drawing is provided for each exercise in the lesson. You must open the drawing provided with each exercise. The exercises in this module are as follows: 1. Navigate the Subassembly Catalog 2. Add Subassemblies to Tool Palette and Modify Subassembly Properties 3. Create an Assembly and Modify Assembly Properties 4. Create a Corridor 5. Modify the Corridor Properties 6. Create a Corridor Surface 7. Prepare 3D Model of Finished Road DesignModule 16 - Roadway Assemblies and Corridors NOTES 16-3 Roadway Assemblies and Corridors This module introduces AutoCAD Civil 3D assembly and corridor functionality that can be applied to road and highway engineering projects. A road or highway transportation design is based on a typical section, which governs the overall configuration of the cross section. The typical section dictates the following:  Elements represented in the cross section: lanes, shoulders, curbs, sidewalks, barriers, guardrails, slopes, and so on.  Geometric configuration of the elements: widths, grades, slopes, depths, and materials. AutoCAD Civil 3D uses assembly objects to represent a typical cross section. An assembly that incorporates lanes, shoulders, guardrails, and match (catch) slope subassembly objects is as shown. Assemblies are created from subassembly objects. Subassemblies are used to represent the cross section elements. The Civil 3D assembly object shown is used to create a corridor model and consists of lane, shoulder, guardrail, and match slope subassemblies. AutoCAD Civil 3D comes with many stock subassemblies that can be used for a number of different typical section elements. Subassemblies are organized in categories in the Subassembly Catalog.AutoCAD Civil 3D 2009 Education Curriculum NOTES 16-4 You organize the subassemblies that you regularly use on AutoCAD tool palettes. You can copy subassemblies from the Subassembly Catalog to your tool palettes. Subassemblies use input parameters that enable you to modify the properties of the subassemblies prior to use. Using input parameters, you can control the geometric properties of the subassemblies and specify widths, slopes, and depths. You modify the default input parameters of the subassemblies on the tool palette.Module 16 - Roadway Assemblies and Corridors NOTES 16-5 To build a typical section, you first insert an assembly object to the drawing and assign a name. Once the assembly object has been created, you then attach the subassemblies from the tool palette. The following illustration shows an assembly with two subassemblies to represent the right and left lanes. Subassembly objects contain points, links, and shapes. Points represent the singular locations and are used to create corridor feature lines. Points can also be used for annotating design cross sections and creating construction staking data. Links connect the points and are used to create corridor surfaces and annotate grades on design cross sections. Shapes connect the links and are used to calculate pavement structure volumes and annotate pavement structure end areas. After the assembly has been created, you then create the corridor object. A corridor is used to represent the final road design and is constructed using anAutoCAD Civil 3D 2009 Education Curriculum NOTES 16-6 alignment, a profile, and an assembly. You can also use other alignments and profiles to control the construction of a corridor. For example, an alignment representing a proposed edge of pavement (EOP) can be used to control the lane width. Once the corridor has been created, you can view the corridor in 3D using the AutoCAD Object Viewer. You can also view and edit the corridor sections for each station along the corridor. For each station, you can modify the subassembly input parameters. You can also change the values for a range of stations.Module 16 - Roadway Assemblies and Corridors NOTES 16-7 After you have created the corridor, you can modify the corridor properties to perform the following tasks:  Add, remove, and change corridor regions. Regions are longitudinal segments along a corridor, delineated with a start and end station. A different assembly can be assigned to each region.  Change the assembly insertion frequency, or the interval along the alignment at which an assembly is inserted to create the corridor.  Define target mapping for specific subassemblies. For example, the match slope (daylighting) subassemblies need to know which surface to project the slopes to. This is called target mapping.AutoCAD Civil 3D 2009 Education Curriculum NOTES 16-8 You can also create corridor surfaces when you modify the corridor properties. Corridor surfaces can be created from links or feature lines. Corridor surfaces are most often created from the datum and top links. All subassemblies have datum and top links. The datum links are located on the bottom of the assembly and are used to create a corridor datum surface. A corridor datum surface is used for calculating earthwork cut and fill volumes. The top links are located on the top of the assembly and are used to create a corridor top surface. A corridor top surface can be used to:  Create 3D models of proposed roads.  Label design spot elevations and grades.  Calculate manhole rim and pipe invert


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UNLV CEE 301 - Roadway Assemblies and Corridors

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