A horizontal alignment consists of two tangent lin connected by a horizontal curve, as shown in figures below. PC is located at sta. 10+00.00. The overall length of the horizontal curve is 400 feet and an 8% superelevation needs to be designed for the curve. The superelevation runoff length is chosen to be 240 feet. The normal cross-section is also shown in the figure. Both left and right sections have 2% slopes for drainage. On the circular curve, the left section is on the external side and therefore needs to be raised while the right section is on the internal side and should be lowered. The rotation axis is on the center line of the highway, which is shown as a black dot in the figure.
A horizontal alignment consists of two tangent lin connected by a horizontal curve, as shown in figures below. PC is located at sta. 10+00.00. The overall length of the horizontal curve is 400 feet and an 8% superelevation needs to be designed for the curve. The superelevation runoff length is chosen to be 240 feet. The normal cross-section is also shown in the figure. Both left and right sections have 2% slopes for drainage. On the circular curve, the left section is on the external side and therefore needs to be raised while the right section is on the internal side and should be lowered. The rotation axis is on the center line of the highway, which is shown as a black dot in the figure.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:3.
A horizontal alignment consists of two tangent lines connected by a
horizontal curve, as shown in figures below. PC is located at sta. 10+00.00. The overall length of
the horizontal curve is 400 feet and an 8% superelevation needs to be designed for the curve.
The superelevation runoff length is chosen to be 240 feet. The normal cross-section is also
shown in the figure. Both left and right sections have 2% slopes for drainage. On the circular
curve, the left section is on the external side and therefore needs to be raised while the right
section is on the internal side and should be lowered. The rotation axis is on the center line of
the highway, which is shown as a black dot in the figure.
+2%
Horizontal Alignment
PC
Sta 10+ 00.00
R
The Normal Crown of the Cross-section
Rotation axis
R
-2%
PT
Calculate the tangent runout length (/)
From which station does the left section start to be raised?
From which station does the right section start to be lowered?
From which station is a full superelevation rate attained?
From which station does the left section change back to the normal crown from the full superelevation?
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