What is the ruling radius of a horizontal curve?
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What is the ruling radius of a horizontal curve?
Dhanya
The maximum comfortable speed on a horizontal curve depends on the radius of the curve. It is possible to design with maximum superelevation and coefficient of friction. If the design speed is increased in the future. So the radius of the curve is not desirable. Therefore a ruling minimum radius can be derived by assuming maximum superelevation and coefficient of friction.
Ruling Radius = v^2/g(e+f)
Generally, the radius of the curve is higher than the ruling radius
GK
The minimum radius of a horizontal curve by considering maximum superelevation and coefficient of friction is called ruling minimum radius.
For Ruling design speed, Ruling minimum radius is given by
R(ruling)=v²/g(e+f)
where,
R=Ruling minimum radius in m
v = ruling design speed in m/s
e = superelevation (0.07)
f = coefficient of friction (0.15)
g = acceleration due to gravity in m/s²