A rising grade of 1.5 percent meets a falling grade of 4.0 percent at station 2+400 of elevation 15.0 m. Design the vertical curve connecting the two tangent grades to conform with the following safe stopping sight distance specifications. Design velocity = 40 mph • Height of an object over the pavement ahead = 0.11 m • Height of driver's eye from the road pavement = 1375 mm • Response-initiation time = 1.5 sec • Coefficient of friction between the road pavement and the tires = 0.10

A rising grade of 1.5 percent meets a falling grade of 4.0 percent at station 2+400 of elevation 15.0 m. Design the vertical curve connecting the two tangent grades to conform with the following safe stopping sight distance specifications. Design velocity = 40 mph • Height of an object over the pavement ahead = 0.11 m • Height of driver's eye from the road pavement = 1375 mm • Response-initiation time = 1.5 sec • Coefficient of friction between the road pavement and the tires = 0.10

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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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
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A +3% grade intersects a -3.4% grade at station 2+990 of elevation 52.30m. Design a vertical summit parabolic curve connecting the two tangent grades to conform with the following safe specifications: Design velocity = 70kph Height of drivers eye from the road pavement = 1.37m = h, Height of object over the pavement = 650mm = h, Perception – reaction time = 2.5 sec = t Coefficient of friction between the road pavement and the tires = 0.15 = f Brake efficiency = 40% Determine: (a) Length of the curve (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 m/s) 2(m)(c0.15)(0.40)+0.03} 70 (v)? 70 SSD = (v)(t) + G m/s)(2.5s) + 3.6 79.01m 2g(f±G) 3.6 = 262.73m CE 31
A 5% grade intersects a -3.4% grade at station 41+990 of elevation 42.30 m. Design a vertical summit parabolic curve connecting the two tangent grades to conform with the following safe stopping sight distance specifications.Design Velocity = 60 kphHeight of driver's eye from the road pavement = 1.37 mHeight of an object over the pavement ahead = 100 mm Perception-reaction time = 3/4 sCoefficient of friction between the road and the tires = 0.15
Design a vertical summit parabolic curve connecting two tangent grades, a 5% grade intersecting a -3.4% grade at station 1 + 990 with an elevation 42.30 meters. The parabolic curve shall conform with the following safe stopping sight distance requirements. Design velocity = 60 kph Height of driver’s eye from the road pavement = 1.37 meters Height of an object over the pavement ahead = 100 mm. Perception/reaction time = 0.75 second Coefficient of friction between the road pavement and the tires = 0.15 Determine the following: Stopping sight distance The length of the curve The elevation of the highest point on curve.
A 4% grade intersects a -2.6% gradw at station 1 +990 of elevation 42.30 m. Design a vertical summit parabolic curve connecting the two tangent grades to conform with the following safe stopping sight distance specifications. Design velocity = 57 kph Height of driver's eye from the pavement = 1.37m Height of an object over the pavement ahead. 100 mm Perception-Reaction time = 3/4 seconds f = 0.13 Determine the stopping sight sight distance in m.
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