A new one-way on-ramp will be constructed from US-460 to Southgate Dr south in Blacksburg and will consist of a combined sag and crest curve with a design speed of 45 mph. The combined crest and sag curve connects a 0% grade to a +2.0 grade and meets at a -3% common grade. For this project, PVC CREST is at Station 0+00.0. For the crest curve, check the last two paragraphs of section 3.3.3 in the text. (A) Calculate the following values: о ACREST, LCREST, ASAG, LSAG, Total L о PVC CREST, PVI CREST, PVT CREST, PVCSAG, PVISAG, PVT SAG (note that PVC, PVI, and PVT values are in stations) (B) Label the following variables and given/calculated values (ie PVC CREST = 0+00.0) on the figure below. Note that the diagram is exaggerated and not to scale. (You can download the png file here)✓ For Crest curve: • PVC, PVI, PVT G1 and G2 ⚫ L For Sag curve: • PVC, PVI, PVT . • G1 and G2 • L For total combined curve: о LTOTAL height Begnning of combined curve End of combined curve 。 Calculate the stations of the lowest and highest points on the combined curve 。 Calculate the height difference between PVCCREST and PVTsag· (C) Thinking about Stopping Sight Distance (SSD), answer the following: 。 Determine what the design SSD is for the combined curve. • Is the length of the combined curve greater or less than SSD? To be conservative, which would you use?
A new one-way on-ramp will be constructed from US-460 to Southgate Dr south in Blacksburg and will consist of a combined sag and crest curve with a design speed of 45 mph. The combined crest and sag curve connects a 0% grade to a +2.0 grade and meets at a -3% common grade. For this project, PVC CREST is at Station 0+00.0. For the crest curve, check the last two paragraphs of section 3.3.3 in the text. (A) Calculate the following values: о ACREST, LCREST, ASAG, LSAG, Total L о PVC CREST, PVI CREST, PVT CREST, PVCSAG, PVISAG, PVT SAG (note that PVC, PVI, and PVT values are in stations) (B) Label the following variables and given/calculated values (ie PVC CREST = 0+00.0) on the figure below. Note that the diagram is exaggerated and not to scale. (You can download the png file here)✓ For Crest curve: • PVC, PVI, PVT G1 and G2 ⚫ L For Sag curve: • PVC, PVI, PVT . • G1 and G2 • L For total combined curve: о LTOTAL height Begnning of combined curve End of combined curve 。 Calculate the stations of the lowest and highest points on the combined curve 。 Calculate the height difference between PVCCREST and PVTsag· (C) Thinking about Stopping Sight Distance (SSD), answer the following: 。 Determine what the design SSD is for the combined curve. • Is the length of the combined curve greater or less than SSD? To be conservative, which would you use?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A new one-way on-ramp will be constructed from US-460 to Southgate Dr south in Blacksburg and will consist of a combined sag and crest curve with
a design speed of 45 mph. The combined crest and sag curve connects a 0% grade to a +2.0 grade and meets at a -3% common grade. For this project,
PVC CREST is at Station 0+00.0. For the crest curve, check the last two paragraphs of section 3.3.3 in the text.
(A) Calculate the following values:
о
ACREST, LCREST, ASAG, LSAG, Total L
о
PVC CREST, PVI CREST, PVT CREST, PVCSAG, PVISAG, PVT SAG (note that PVC, PVI, and PVT values are in stations)
(B) Label the following variables and given/calculated values (ie PVC CREST = 0+00.0) on the figure below. Note that the diagram is exaggerated and not
to scale. (You can download the png file here)✓
For Crest curve:
• PVC, PVI, PVT
G1 and G2
⚫ L
For Sag curve:
• PVC, PVI, PVT
.
• G1 and G2
• L
For total combined curve:
о
LTOTAL
height
Begnning of combined curve
End of combined curve
。 Calculate the stations of the lowest and highest points on the combined curve
。 Calculate the height difference between PVCCREST and PVTsag·
(C) Thinking about Stopping Sight Distance (SSD), answer the following:
。 Determine what the design SSD is for the combined curve.
• Is the length of the combined curve greater or less than SSD? To be conservative, which would you use?
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