Civil Engineering - Surveying - Discussion
Discussion Forum : Surveying - Section 1 (Q.No. 3)
3.
An ideal vertical curve to join two gradients, is
Discussion:
45 comments Page 1 of 5.
Reuben said:
10 years ago
A rising gradient of 1 in 40 is to be connected with a falling gradient of 1 in 75 by means of a vertical equal tangent parabolic curve 400 m in length. The reduce level at the intersection point of the tangent is 26.850.
Calculate:
(1) The rate of change of grade.
(2) The reduced levels at the beginning and end tangent points.
Calculate:
(1) The rate of change of grade.
(2) The reduced levels at the beginning and end tangent points.
Subhash Kumar said:
7 years ago
A cubic spiral is suitable to cubic parabola but latter is used mostly because of its ease in setting out. Vertical curves are provided to negotiate the gradient of the two straights. Parabola is most suitable shape for vertical curves since it provides a uniform rate of change of gradient and smooth riding condition.
Akshu said:
8 years ago
Ideal vertical curve is circular if sight distance available throughout the length of curve is constant it possible only in case of Joining one Gradient.
In this case, two gradient are Joint by curve therefore sight distance is not constant throughout the length of curve so we provide Simple Parabolic curve.
In this case, two gradient are Joint by curve therefore sight distance is not constant throughout the length of curve so we provide Simple Parabolic curve.
Atul said:
5 years ago
Ideal vertical curve is circular if sight distance available throughout the length of curve is constant it possible only in case of Joining one Gradient. In this case, two gradient are Joint by curve therefore sight distance is not constant throughout the length of curve so we provide Simple Parabolic curve.
(5)
Asif Jamal said:
5 years ago
Ideal vertical curve is circular if sight distance available throughout the length of curve is constant it possible only in case of Joining one Gradient. In this case, two gradient are Joint by curve therefore sight distance is not constant throughout the length of curve so we provide Simple Parabolic curve.
(2)
Rohan mehta said:
7 years ago
In highway engineering, we deal with two type of vertical curves summit and valley.
IRC CLEARLY have defined the ideal vertical curves for summit it is circular and for valley it is cubic.
IRC CLEARLY have defined the ideal vertical curves for summit it is circular and for valley it is cubic.
(1)
Obaidb said:
6 years ago
Because the parabolic curve can be either sag or summit curve, in both the cases parabolic curve provides the best curve to provide maximum comfort to the passengers pr driver.
Mahesh said:
10 years ago
The main design criteria in a vertical curve is headlight sight distance. So I think it may be circular as the sight distance available at each point is same.
Sakshi Mehta said:
2 years ago
In conclusion, a parabolic curve is the most ideal type of vertical curve to join two gradients in highway engineering. (B) option is the correct answer.
(2)
Basharat rabani said:
4 years ago
Ideal vertical curve is circular but vertical curve provided in field is square parabola for summit curves and cubic parabola for valley curves.
(11)
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