Question

In designing the vertical profile of railway
track, it is observed that the length of
vertical curve with a rising gradient at a
rate of change of 1% meeting a down
gradient with a rate of change of 0.5 % in
a valley curve is

options.
A.412 m
B.543 m

C.457 m

D.915 m​

Answer 1

Answer:

Explanation:

Vertical Curves

 

An angle is formed at the point where two different gradients meet, forming a summit or a sag as explained in Fig. 13.18. The angle formed at the point of contact of the gradients is smoothened by providing a curve called the vertical curve in the vertical plane. In the absence of a vertical curve, vehicles are likely to have a rough run on the track. Besides this, a change in the gradient may also cause bunching of vehicles in the sags and a variation in the tension of couplings in the summits, resulting in train parting and an uncomfortable ride. To avoid these ill effects, the change in gradient is smoothened by providing a vertical curve. A rising gradient is normally considered positive and a failing gradient is considered negative.

 

A vertical curve is normally designed as a circular curve. The circular profile en-sures a uniform rate of change of gradient, which controls the rotational acceleration.

Answer 2

Explanation:

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