The rate of change of radial acceleration governs the:

Question

Question

This question was previously asked in

JKSSB JE Civil Jal Shakti 6 Dec 2022 Official Paper (Shift 1)

Answer 1

Concept:

The length of the transition curve is designed to fulfill three conditions given below:

The rate of change of centrifugal (radial) acceleration is to be developed gradually.
The rate of introduction of the designed super elevation is to be at a reasonable rate.
The minimum length by IRC empirical formula.

The length of the transition curve fulfilling all three conditions (or the high of the three values) is generally accepted.

\(C={v^3\over L_sR}\)

Where \(C=Rate\, of\, change\, centrifugal\, acceleration={({v^2\over R})\over t}\)

\(v=Design\, speed\)

\(L_s=Length\, of\, transition\, curve\)

\(R=Radius\, of\, curve\)