Alignment Chapter
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What are the steps when designing a project 1. import the existing conditions 2. layout a 2d version of key features i.e. building outlines, road centerlines, pipe networks
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what types of segments make up an alignment? tangents, curves, and spirals
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What connects segments? geometry points that include PI, PC, and PT
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What are segment properties? they can be Fixed, Floating, and Free
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Profile Chapter
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How to edit/see a profile? create a profile view
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How to make a design profile? A profile view must be in the drawing to create a design profile, even if its empty
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Profile Definitions
Profile View |
a plot with distance along alignment on X axis and elevation on Y axis |
Surface Profile |
elevations of profile are determined from a surface in the drawings |
Design or Layout Profile |
elevations are entered by the user to represent the elevations of the proposed design |
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Alignment Definitions
Alignment |
a 2d line made of straight and/or curved segments, used to represent linear projects such as roads, pipelines, streams, has no elevation but it has direction |
Tangents |
straight segments |
Curves |
curved segments with a constant radius (arcs) |
Spirals |
curved segments that change in radius from one end to the other |
PI |
Point of Intersection, where 2 tangents intersect or would intersect |
PC |
Point of Curvature, place where the curve begins |
PT |
Point of Tangency, place where the curve sends |
Fixed |
editable only be adjusting its geometry points, does not depend on another segment |
Floating |
attachable only to another fixed or floating segment, dependent on and always attached to the before segment |
Free |
located between fixed or floating segments, defined by before and after segments |
Station |
A number representing the horizontal distance between a point on the alignment and the start of the alignment |
Station number format |
Full + Partial, full=the number of 100 ft intervals, partial=remaining distance |
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