Question For a portion of national highway where a descending gradient of 1 in 25 meets with an ascending gradient of 1 in 20, a valley curve needs to be designed for a vehicle travelling at 90 kmph based on the following conditions. (i) headlight sight distance equal to the stopping sight distance (SSD) of a level terrain considering length of valley curve > SSD. (ii) comfort condition with allow ablerate of change of centrifugal acceleration = 0.5 m/sec³. Assume total reaction time = 2.5 seconds; coefficient of longitudinal friction of the pavement = 0.35; height of head light of the vehicle = 0.75 m; and beam angle = 1°. What is the length of valley curve (in m) based on the comfort condition?_

Question For a portion of national highway where a descending gradient of 1 in 25 meets with an ascending gradient of 1 in 20, a valley curve needs to be designed for a vehicle travelling at 90 kmph based on the following conditions. (i) headlight sight distance equal to the stopping sight distance (SSD) of a level terrain considering length of valley curve > SSD. (ii) comfort condition with allow ablerate of change of centrifugal acceleration = 0.5 m/sec³. Assume total reaction time = 2.5 seconds; coefficient of longitudinal friction of the pavement = 0.35; height of head light of the vehicle = 0.75 m; and beam angle = 1°. What is the length of valley curve (in m) based on the comfort condition?_

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

assume reaction time and coefficient of lateral friction.
A vehicle is negotiating a horizontal curve with a velocity of 50 kmph. The width and height of the vehicle is 1.80 m and 1.50 m respectively. Assume no super elevation is provided, what is the value of maximum lateral friction coefficient so that vehicle does not overturn?
A valley curve is formed by a descending grade of 1 in 20 meeting an ascending grade of 1 in 30. What is the length of valley curve (in m) to fulfill comfort condition for a design speed kmph? of 85 [Assume allowable rate of change of centrifugal acceleration, C 0.65 m/sec³]
A 8-degree simple curve is to be designed for a maximum speed of 91.8kph. The coefficient of friction between the tires and pavement is 0.32. What is the required super elevation in percent?
A crest vertical curve joins two gradients of 3% and - 2% for a design speed of 80 km/h and the corresponding stopping sight distance of 120 m. The height of driver's eye and the object above the road surface are 1.20 m. and 0.15 m respectively. The curve length (which is less than stopping sight distance) to be provided is
A vehicle travelling at design speed of 80 kmph on a descending gradient of 2.5% meets on ascending grade of 3%. Calculate the minimum length of vertical curve required (in meters) to facilitate smooth movement of vehicle considering head light sight distance of 100 m and assume that passenger is comfortable is all conditions,
Question- If design velocity on the curve is 100 kmph then find the design super elevation on a 4 degree horizontal curve for narrow gauge track.
Question 14 A blind horizontal curve has a length equivalent to 54 meters. If the the design sight distance is equivalent to 67 meters, and the middle ordinate is equivalent to 8.2 meters, Calculate the minimum radius of the curve so it can be classified SAFE. • Question 16 A vehicle traverses a superelevated curve at 52 kph. If the radius of the curve is 64 meters, and the coefficient of friction is equal to 0.3, calculate the angle of superelevation (0) as measured from the horizontal.
A 4-lane divided highway has a highway grade of -1.5%. The minor road approach grade is 3.5%. The design speed is 45 mph for the major road and 40 mph for the minor road. Find the left turn departure sight distance for a passenger car turning left from the minor road to the major road, The answer should be in feet.
A simple horizontal curve has 35 degrees of curvature and subtends an angle of 110 degrees. If the PC is at station 3 + 65.00 ft, what is the last deflection angle (degrees) (i.e. the angle subtended by the roadway between the last full station and the PT)? Response Feedback: ΔΙ L
Quick...