11 Vertical Curves

11 Vertical Curves - Implies equal curve tangents y is the...

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Vertical Curves CE 111
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Horizontal Curves Vertical Curves
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Crest Vertical Curves G 1 G 2 PVI PVT PVC Line of Sight
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Design Controls for Crest Vertical Curves from AASHTO’s A Policy on Geometric Design of Highways and Streets 2001
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Vertical Curves: “Crest” Curve “Sag” Curve Provides a smooth transition between different grades Parabola - constant rate of change of grade GRADE: 4.00’ 100’ Grade = +4.00% + rising grad - falling grade
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Stationing Horizontal Alignment Vertical Alignment
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Vertical Curve Fundamentals Parabolic function Constant rate of change of slope
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Unformatted text preview: Implies equal curve tangents y is the roadway elevation x stations (or feet) from the beginning of the curve c bx ax y 2 BVC EVC Xp Yp L/2 L/2 L = curve length Y X Vertical Curve Geometry V Constant rate of change of Grade r r = (g 2 g 1 ) / L R should be low (long L) for rider comfort and sight distance Equation of Curve (parabola): Y = Y BVC + g 1 X + ((g 2 g 1 )/2L) X 2 Units: g in %, L and X in stations, Y in ft/meters Or G in fractions (0.04), L, X, Y in ft/meters...
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11 Vertical Curves - Implies equal curve tangents y is the...

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