NOTES Module 15 Roadway Alignments and Profiles In this module, you learn how to create horizontal alignments, surface profiles, layout (design) profiles, and profile views in AutoCAD Civil 3D. This module is the first in a series of four modules that address road and highway transportation design tasks using AutoCAD Civil 3D. The road design concepts presented in Modules 8 to 11 are applicable to subdivision design projects. The process for corridor design for subdivisions is different from the process for corridor design for road and highway transportation projects. Modules 15 to 18 introduce extended road design functionality typical for road and highway projects. Objectives After completing this module, you will be able to: Create a horizontal alignment using the Alignment Layout tools. Assign station reference points and design speeds, and calculate and apply superelevations. Assign an alignment style, label the alignment, and create a table. Create a surface profile and profile view. Create, edit, and annotate layout profiles.AutoCAD Civil 3D 2009 Education Curriculum NOTES 15-2 Notes to Instructor Data for this module resides in the \AutoCAD Civil 3D 2009 Education Curriculum\Module 15 - Roadway Alignments and Profiles\ 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. For those working in the Imperial system 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. You are provided with a drawing for each exercise in the lesson. You must open the drawings provided with each exercise. The exercises in this module are as follows: 1. Create a Horizontal Alignment Using the Alignment Layout Tools 2. Use Station Reference Points, Design Speeds, and Superelevations 3. Assign and Alignment Style, Label the Alignment, and Create a Table 4. Create a Surface Profile and a Profile View 5. Create, Edit, and Annotate Layout ProfilesModule 15 - Roadway Alignments and Profiles NOTES 15-3 Roadway Alignments and Profiles Roadway alignments and profiles set the horizontal and vertical positions for transportation corridor models. The horizontal alignment is created to not only serve a functional purpose, but to meet the design standards criteria of the local jurisdiction. Alignment objects can represent centerlines, lanes, edge of pavement, shoulders, right-of-ways, or construction baselines. Design speeds can be assigned to different positions along the horizontal alignment. You use commands on the Alignment Layout Tools toolbar to create the alignment geometry. There are a number of useful commands to create tangents, curves, and spirals. You can also assign design speeds to different station locations on an alignment. These station locations and design speeds are referenced when superelevation is calculated for the alignment.AutoCAD Civil 3D 2009 Education Curriculum NOTES 15-4 Civil 3D comes with both Imperial (AASHTO) and Metric design speed and superelevation tables. Once superelevation is applied, Civil 3D calculates and displays the critical superelevation points along the alignment. The station locations, superelevation descriptions (types), and slopes can be manually adjusted for each station to suit the needs of the design. Alignment styles control the display of alignment objects. Major Station, Minor Station, and Geometry Point label styles are collected in a label set and applied to an alignment object.Module 15 - Roadway Alignments and Profiles NOTES 15-5 You can also apply tag labels on an alignment and create an associated segment table. In Civil 3D, profile objects are used to represent existing ground profiles (surface profiles) and design (layout) profiles. Surface profiles are calculated for an alignment from a selected DTM surface. The Profile style controls the display of the surface profile. Surface profiles dynamically react to changes in alignment geometry and surface data. The profile view is the object representing the profile grid that displays the profile object data. The Profile View style controls the display of the profile view. The profile view and a surface profile are as shown.AutoCAD Civil 3D 2009 Education Curriculum NOTES 15-6 Design (layout) profiles are also displayed in the profile view. There are a number of commands on the Profile Layout Tools toolbar to help you create design profiles. Design profiles can be edited graphically using grips on the PVI’s, tangents, and vertical curves. The design profile can also be edited in a table. As with horizontal alignments, a profile label set is a collection of individual profiles styles and is applied to a design profile. The position of profileModule 15 - Roadway Alignments and Profiles NOTES 15-7 labels can be edited graphically.AutoCAD Civil 3D 2009 Education Curriculum NOTES 15-8 Key Terms Alignment The alignment controls the horizontal location of a transportation corridor model. Alignments can be made from lines, curves, and arcs. Alignments are created from commands on the Alignment Layout Tools toolbar. Alignments can also be created from AutoCAD objects such as lines, arcs, and polylines. Alignment Component Alignments are created and displayed with components. The alignment components are the line, curve, spiral, arrow, line extensions, and curve extensions. Alignment Style The alignment style controls the display of an alignment object. You can apply specific markers to alignment geometry points and assign the display properties for the alignment component. Alignment Label Set An alignment label set is a collection of alignment label styles and is applied to an alignment. Alignment Label Style An alignment label style is used to annotate stationing and geometric data along an alignment. Individual alignment label styles are used to annotate major stations, minor stations, and geometry points. Design Speed Design speeds are assigned to an alignment and are part of the design criteria. Design speeds are established based on safety parameters and are used to indicate substandard horizontal and vertical curves and for superelevation calculations. Profile A profile represents surface and design (layout) profiles. Profile (Existing Surface) The existing surface profile is
View Full Document
Unlocking...