6 - Chapter3-HorizontalCurves

6 - Chapter3-HorizontalCurves - Geometric Highway Design:...

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Geometric Highway Design: Horizontal Curves TTE 4004 Lecture 6 9/12/11
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Chapter 3 Outline Vertical Curve Design Vertical curve fundamentals Stopping sight distance Crest vertical curves Sag vertical curves Passing sight distance – crest vertical curves Underpass sight distance – sag vertical curves Horizontal Curve Design Vehicle cornering Horizontal curve fundamentals Stopping sight distance – horizontal curves Combination of horizontal and vertical curves
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Recap: Vertical Curves PVC: Point of Vertical Curvature PVI: Point of Vertical Intersection (of initial and final tangents) PVT: Point of Vertical Tangency
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Recap: Vertical Curves Parabolic curves are generally used for design Parabolic function y = ax 2 + bx + c 1 G dx dy b = = ( 29 L G G a 2 1 2 - =
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Recap: Vertical Curve Offsets 2 200 x L A Y = 800 AL Y m = 200 AL Y f =
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Recap: Crest Vertical Curve US Customary Metric For SSD < L 2158 SSD 2 × = A L m 658 SSD 2 × = A L m (3.15) For SSD > L A L m 2158 SSD 2 - × = A L m 658 SSD 2 - × = (3.16)
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Recap: Sag Vertical Curve US Customary Metric For SSD < L SSD 5 3 400 SSD 2 × × = . + A L m SSD 5 3 120 SSD 2 × × = . + A L m (3.21) For SSD > L A . + L m SSD 5 3 400 SSD 2 × - × = A . + L m SSD 5 3 120 SSD 2 × - × = (3.22)
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Recap: Passing Sight Distance Important for crest vertical curves on two- lane roads
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Recap: Underpass Sight Distance + - = 2 800 2 1 2 H H H AS L c m Eq. 3.27 S < L A H H H S L c m + - - = 2 800 2 2 1 Eq. 3.28 S > L
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Sag Curve Example A 1600-ft-long sag vertical curve (equal tangent) as a PVC at station 120+00 and elevation 1500 ft. The initial grade is -3.5% and the final grade is 6.5%. Determine the elevation and stationing of the low point, PVI, and PVT.
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PVI Station Elevation
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PVT Station Elevation Elevation
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PVT (Continued) Elevation
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Low Point - Station
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Low Point - Elevation
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This note was uploaded on 12/07/2011 for the course TTE 4004 taught by Professor Staff during the Fall '08 term at University of Florida.

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6 - Chapter3-HorizontalCurves - Geometric Highway Design:...

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