GATE Civil Engineering (CE) 2013 Solved Paper
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Question Numbers: 60-61
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 allowable rate 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°.
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 allowable rate 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°.
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Question : 60
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