Compound Curves Flashcards
Consists of two or more consecutive simple curves having different radius, but
whose centers lie on the same
side of the curve, likewise any two tangents at their meeting point
Compound Curves
Point of the common tangent where the two curves
join
Point of
Compound Curvature (PCC)
Distance from PC to PI
Back Tangent (T1)
Distance from PT to PI
Forward Tangent (T2)
Point of intersection of the first curve
Vertex of the First Simple Curve (A)
Point of intersection of the second curve
Vertex of the Second Simple Curve (B)
Tangent distance of the first simple curve
t1
Tangent distance of the second simple curve
t2
Straight line from A to B
Common Tangent (AB)
Length of curve from PC to PT
Length of the Compound Curve (LCC)
Straight line drawn from PC to PT
Long Chord of the Compound Curve (C)
Formula of the Common Tangent
AB = t1+t2
Formula of Station PC
Sta PC = Sta PI-T1
Formula of Station PCC
Sta PCC = Sta PC+LC1
Formula of Station PT
Sta Pt = Sta PCC+LC2
