Autodesk CIVIL3D Tutorial - Page 300
Exercise 1: Creating a Layout Profile
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Vertical curves can be one of two basic types: crest curves or sag curves. ■ A crest curve exists at a hilltop, or wherever the incoming tangent has a higher grade than the outgoing tangent. There are three types of crest curves: a positive to negative grade transition, positive to positive, and negative to negative. The point of vertical intersection (PVI) of a crest curve is above the curve. ■ A sag curve exists at the bottom of a valley, or wherever the incoming tangent has a lower grade than the outgoing tangent. There are three types of sag curves: a negative to positive grade transition, negative to negative, and positive to positive. The PVI of a sag curve is below the curve. The vertical curves on a layout profile can be designed in relation to engineering speed tables for safe vehicular travel at a particular maximum speed. Other tables can be used to design vertical curves so that the distance illuminated by the headlights of a vehicle at night is always greater than the stopping distance at the maximum design speed. For more information, see the AutoCAD Civil 3D Help topics Creating Layout Profiles and Vertical Curve Design. Exercise 1: Creating a Layout Profile In this exercise, you will create the layout profile. Typically, this profile is used to show the elevations along a proposed road surface or a finished grade. The layout profile is similar to a horizontal alignment, in that it is constructed of straight tangents with optional curves placed where the tangents intersect. These tangents and curves on a layout profile are located in the vertical plane and the intersection points are called points of vertical intersection (PVI). For more information, see the AutoCAD Civil 3D Help topic Creating Layout Profiles. This exercise continues from the Using Surface Profiles (page 279) tutorial. Hide the offset profiles 1 Open Profile-2C.dwg, which is located in the tutorial drawings folder (page 819). 2 Click the bottom grid to select profile view PV-1. Right-click. Click Profile View Properties. 288 | Chapter 9 Profiles Tutorials