A 5% grade intersects a -3.4% grade at station 1+990 of elevation 42.30m. Design a vertical summit parabolic curve connecting the two tangent grades to conform with the following safe specifications: 1. Design velocity = 60kph 2. Height of drivers eye from the road pavement 1.37m 3. Height of object over the pavement = 100mm 4. Perception - reaction time 0.75 sec 5. Coefficient of friction between the road pavement and the tires = 0.15 Determine the (a) Stopping sight distance (b) Station of P.C and P.T. and the location of the highest point of the curve (c) elevation of the highest point of the curve

A 5% grade intersects a -3.4% grade at station 1+990 of elevation 42.30m. Design a vertical summit parabolic curve connecting the two tangent grades to conform with the following safe specifications: 1. Design velocity = 60kph 2. Height of drivers eye from the road pavement 1.37m 3. Height of object over the pavement = 100mm 4. Perception - reaction time 0.75 sec 5. Coefficient of friction between the road pavement and the tires = 0.15 Determine the (a) Stopping sight distance (b) Station of P.C and P.T. and the location of the highest point of the curve (c) elevation of the highest point of the curve

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. 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…
Determine variables requested below for a horizontal curve with the following characteristics. Length of curve 1255', Radius 1200', sta of PC 12+00 superelevation rotated about the roadway centerline, 3 lane roadway, 14ft lane width, entire road section normal crown=2%, road design speed=60 mph, max superelevation=8% 2) The design/full superelevation, in %, is: O 7.2 O 7.4 O 7.6 O 7.8 O 8.0
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An equal-tangent vertical curve connects a +3.2 % and a -1.1 % grade. The PVI is at station 100+20 and elevation 950 ft and the PVT is at station 105+20. Answer the following 5 questions Question 3 to Question 7. The station of the PVC is at: sta 93+20 sta 95+20 sta 97+20 sta 99+20 sta 105+20
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A vertical curve is formed on a two lane undivided highway between the tangents of 1 gradient + 1 Assume the height of driver's eye and height of obstruction and 100 50 as 1.4 m and 0.18 m respectively. Determine the length of vertical curve so formed considering stopping sight distance calculated using the following parameters. Design speed of vehicle = 80 kmph Reaction time = 2.5 sec Down gradient = 2.5% Coefficient of longitudinal friction = 0.38
Q\ on a certain highway section, a +2% grade meets a -8% at a point with an elevation of 50m. The symmetrical parabolic curve joining the two grades provide a safe driving speed of 120 km\hr. determine the elevation of the highest point on the pavement surface within this section? in Assume a=3.41lm\sec² , S
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