A valley curve is formed by a descending grade of I in 30 meeting an ascending grade of I in 40. Design the length of valley curve to fulfill (a) Comfort condition and (b) Head light sight distance requirement for a design speed of 85 kmph. The allowable rate of change of centrifugal acceleration may be assumed as c = 0.6 m/s³,. reaction time 2.5 s, coefficient of longitudinal friction, f = 0.35. -

A valley curve is formed by a descending grade of I in 30 meeting an ascending grade of I in 40. Design the length of valley curve to fulfill (a) Comfort condition and (b) Head light sight distance requirement for a design speed of 85 kmph. The allowable rate of change of centrifugal acceleration may be assumed as c = 0.6 m/s³,. reaction time 2.5 s, coefficient of longitudinal friction, f = 0.35. -

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

Highway Engineering
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]
Prob.12. Actual cant is 8.24 cm for the speed of 60 kmph on a metre gauge curve. Calculate the grade compensation required on the curve.
A vertical curve (with EQUAL tangent lengths) is to connect a +1.35% gradient to a -2.25% gradient on a highway designed for a speed of 80 kmph. The K value for the highway is 55 and the minimum required length is to be used. The reduced level and through chainage of the intersection point of the gradients are 78.34 metres and 667.49 metres respectively. i) ii) Calculate the reduced levels and the chainages of the tangent points. Calculate the reduced levels at exact 25 metre multiples of through chainage along the curve. ii) Calculate the through chainage and the reduced level of the highest point on the curve.
b. A valley (sag) curve is formed by a descending gradient of 1 in 50 which meets an ascending gradient of 1 in 40. Design the total length of the valley curve, if the design speed is 80 km/h. so as to fulfill both comfort condition and head light distance for night driving, after calculating SSD required. Assuming that the coefficient of friction between the tyres and the pavement is 0.30 and perception-reaction time is 2.5 seconds.
1. Two vertical parabolic curves have been connected to form a roadway by three gradients: -5.30 %, 4.10 % and -3.70 % respectively. If the length of the second curve is twice as the length of the first curve, compute the following: a. The length of the second curve in ft given that the design speed of the first curve is 80 kph assuming a vertical radial acceleration of 0.3m/s for comfort criterion. b. The length of the second curve in m if the headlight height of the vehicle is 0.73 m above the first curve and the inclined upward angle of the headlight beam relative to the horizontal plane of the vehicle is 1.57'. The design speed for the first curve for this situation is 90 kph. c. The length of the first curve in yard if the total length of the roadway is 745 m given that the second curve has a design speed of 70 kph for passing sight distance with the driver's eye height assumed to be 1.5 mand object height of 0.33 m d. The total length of the roadway in km if a bridge structure…
A horizontal curve has 2 lanes per direction. The radius, measured to the center marking that separates the two opposing directions is 700 ft. The lane width is 14 ft. The wall of the tunnel is 10 ft from the right edge of the right travel lane. Calculate S. If vehicle A traveling at 50 mph on the right lane has just passed the PC, and vehicle B is stopped in the middle of the right lane at PT, can vehicle A stop before colliding with vehicle B? Explain your answer.
A sag curve connects a -1.5 percent grade with a +2.5 percent grade on a rural arterial highway. The criterion selected for design is the minimum stopping sight distance, and the design speed of the highway is 70 mph. Assume the perception-reaction time of 2.5 seconds and a deceleration rate of 11.2 ft./sec^2. a. Determine the length of the curve. b. Compute the elevation of the curve at PVC and PVT if the grades intersect at station (475 + 00) at an elevation of 300 ft.
Please show complete solutions and box the final answers
Question The maximum speed on a BG main track if 100 kmph. The track meets a circular curve of radius 275m. The super elevation to be provided is (in cm).
Solve with explanation