Structural Analysis
Structural Analysis
6th Edition
ISBN: 9781337630931
Author: KASSIMALI, Aslam.
Publisher: Cengage,
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only answer question 6

You are designing a vertical sag curve joining a -3% grade to a +2% grade. The design speed is 60 mph. For the design of the curve, the stopping sight distance is based on a 0% grade. 1. Is the shape of the vertical curve circular, elliptic, or parabolic? 2. What is the value of A? 3. What is AASHTO’s recommended perception reaction time (s)? 4. What is AASHTO’s recommended deceleration rate (ft/s²)? 5. What is the assumed height (ft) of the driver’s eye for passenger cars? 6. What is the assumed height (ft) of the object? 7. Assuming a 0% grade, and AASHTO’s recommended perception reaction time and recommended deceleration rate, what is the brake reaction distance (ft)? 8. Assuming a 0% grade, and AASHTO’s recommended perception reaction time and recommended deceleration rate, what is the braking distance (ft)?
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Transcribed Image Text:You are designing a vertical sag curve joining a -3% grade to a +2% grade. The design speed is 60 mph. For the design of the curve, the stopping sight distance is based on a 0% grade. 1. Is the shape of the vertical curve circular, elliptic, or parabolic? 2. What is the value of A? 3. What is AASHTO’s recommended perception reaction time (s)? 4. What is AASHTO’s recommended deceleration rate (ft/s²)? 5. What is the assumed height (ft) of the driver’s eye for passenger cars? 6. What is the assumed height (ft) of the object? 7. Assuming a 0% grade, and AASHTO’s recommended perception reaction time and recommended deceleration rate, what is the brake reaction distance (ft)? 8. Assuming a 0% grade, and AASHTO’s recommended perception reaction time and recommended deceleration rate, what is the braking distance (ft)?
Expert Solution
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Step 1

Stopping Sight Distance is the minimum distance that must be available in front of driver so that he can safely stop his vehicle before the collision. stopping sight distance depends upon:

  • Features of road
  • height of object
  • height of eye of driver above ground
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