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A +2.5% grade intersects with a –1.5% grade at station (53+524.25) at an elevation of 90 m. If the design speed is 90 km/h, use AASHTO (2011) criteria to determine: The minimum length of vertical curve using the rate of vertical curvature. The stations and elevations of the BVC and EVC. The elevation of each 20-m station. The station and elevation of the highpoint.

A +2.5% grade intersects with a –1.5% grade at station (53+524.25) at an elevation of 90 m. If the design speed is 90 km/h, use AASHTO (2011) criteria to determine: The minimum length of vertical curve using the rate of vertical curvature. The stations and elevations of the BVC and EVC. The elevation of each 20-m station. The station and elevation of the highpoint.

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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  1. A +2.5% grade intersects with a –1.5% grade at station (53+524.25) at an elevation of 90 m.

If the design speed is 90 km/h, use AASHTO (2011) criteria to determine:

  1. The minimum length of vertical curve using the rate of vertical curvature.
  2. The stations and elevations of the BVC and EVC.
  3. The elevation of each 20-m station.
  4. The station and elevation of the highpoint.
Values of K for Crest Vertical Curves Based on Stopping Sight Distance Rate of Vertical Curvature, Kª Stopping Sight Distance (ft) Design Speed (mi/h) Calculated Design 15 80 3.0 3 20 115 6.1 7 25 30 35 155 200 250 11.1 18.5 29.0 12 19 29 40 45 305 360 43.1 60.1 83.7 113.5 44 61 50 425 55 60 495 570 84 114 151 150.6 65 70 645 730 820 192.8 246.9 193 247 75 311.6 312 80 910 383.7 384
Transcribed Image Text:Values of K for Crest Vertical Curves Based on Stopping Sight Distance Rate of Vertical Curvature, Kª Stopping Sight Distance (ft) Design Speed (mi/h) Calculated Design 15 80 3.0 3 20 115 6.1 7 25 30 35 155 200 250 11.1 18.5 29.0 12 19 29 40 45 305 360 43.1 60.1 83.7 113.5 44 61 50 425 55 60 495 570 84 114 151 150.6 65 70 645 730 820 192.8 246.9 193 247 75 311.6 312 80 910 383.7 384
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