Civil Engg. Subjects 
Video Training Tutorial 
Civil Related LinksGSM ► Surveying & Levelling ► Compound Curves
|
Compound curves in Engineering Survey |
|
Advertisements
|
Definition:Combination of two or more simple circular curves of different radius having their curvature in the same direction. Essentially, a compound curve consists of two curves that are joined at a point of tangency and are located on the same side of a common tangent. Though their radii are in the same direction, they are of different values. |
| tr= perception/reaction time (seconds) f = AASHTO stopping friction coefficient (dimensionless) G = roadway grade (dimensionless) e = superelevation, fs = the coefficient of side friction, g = the acceleration due to gravity (=9.81 m/s2) and v = the vehicle speed. m = distance from centerline to sight obstruction L = length of curve S = sight distance (ds) R = Radius of centerline Rv =Radius to driver’s eye (middle of lane) T = Tangent Length C= Length of Chord (Long Chord from PC to PT) E= External Distance M = Middle Ordinate Delta = Deflection Angle | |
