Read the question carefully and give complete solution. Dont miss anything.X=10 Q3. A vertical curve is to be designed to join gradients of -2 and -4% with the design speed of60mph. PVI of the curve is located at station 200+X at an elevation of 120ft. Find out length ofcurve, stationing and elevation of PVC, PVT and lowest point on the curve. Perception reactiontime is 2.5 sec for drivers and coefficient of friction is taken as 0.348.

Stationing of PVI = 200+10 Elevation of PVI = 120ft Initial Grade G1 = -2% = b Final Grade G2 = -4%…

Answered: Q3. A vertical curve is to be designed…

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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Q1. A rising gradient AB and a falling gradient BC are to be connected by a vertical curve. Based on the data given in Table Q1, design the curve at 20 metres intervals. First Grade (± %) Second Grade (± %) Sighting Distance (SSD) Driver's eye (h₂) Object height (h₂) 3.6 -1.7 150 1.05 0.3 Table Q1 (Units are in metres) RL of highest/lowest pt Chainage of highest/lowest pt 38.788 3621.191
A vertical summit curve is formed at the intersection of two gradients with a deviation angle of 0.025. Design the length of summit curve to provide a stopping sight distance for a design speed of 80 kmph. Assume the following: (i) Reaction time = 2.5 seconds (ii) Coefficient of lateral friction = 0.15 (iii) Coefficient of longitudinal friction = 0.35 (iv) Height of eye level of driver above pavement way surface = 1.4 m (v) Height of object above the pavement surface = 0.2 m
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.
A transition curve is required for a circular curve of radius 210 m and the gauge is 1.4 m. The permissible super-elevation is 70 mm. The transition curve is to be so designed that no lateral pressure is imposed on the wheels. The rate of change of radial acceleration is to be kept at 0.25 m/s2/s. Starting from the first principles find the length of transition curve and the design speed.
Example 8. A 1.5% gradient meets a - 0.5% gradient at a chainage of 1000 m and reduced level of 75 m. The sight distance is 300 m. Determine length of the vertical curve and R.L. of the tangent points. Assume that eye level of the driver is 1.125 m above the road surface.
Q1) The project speed is 100 km/h on a divided state road with a vertical curve. The driver's transition reaction time is 2.0 seconds; the friction coefficient is 0.4. Accordingly, calculate the following: a) The slopes of and g2. b) The vertical curve length (L). c) Calculate the grade line elevation of the points T1 and T2 as well every 30 meters and present them in a table format. T1 A Station 0+000 Elevation = 400 m Station 1+200 Elevation 460 m P T2 B Station 2+200 Elevation 490 m
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.
Determine the radius of horizontal curve for a design speed of 50 kph as specified by the specifications in lateral friction and super elevation. a. 79.61 m b. 89.51 m C. 50 m d. 75 m
Question-7 A horizontal circular curve with a centre line radius of 200 m is provided on a 2-lane, 2-way SH section. The width of the 2-lane road is 7.0 m. Design speed for this section is 80 km per hour. The brake reaction time is 2.4 s, and the coefficients of friction is longitudinal and lateral directions are 0.355 and 0.15, respectively. The safe stopping sight distance on the section is
The radius of the central curve is 380m with design speed of 80kph. Determine the length of the transition curve to limit the centrifugal acceleration.
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).
Determine the length of transition curve and offsets at every 15 metres for BG curved track having 4° curvature and cant of 12 cm. The maximum permissible speed on curve is 85 kmph.

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