MINIMUM RADIUS OF CURVATURE (FORMULAS)

Question 1

Minimum radius of Curvature

Answer 1

R = v^2 / 127 (e+f)
R = min radius of curve
e = superelevation (m/m)
f = coefficient of side friction/ skid resistance
v = design speed in kph

Question 2

Degree of Curvature

Answer 2

D = 1145.916 / R
D = deg. of curvature in deg.
R = radius of curvature in meters

Question 2

Centrifugal ratio/ Impact factor

Answer 2

Impact Factor = v^2 / gr
v = design speed
g = 9.81 m/s^2
r = radius of curvature (m)

Question 3

Ideal Angle of Embankment

Answer 3

tan θ = v^2 / gr
v = velocity (m/s)
θ = angle of embankment
g = 9.81 m/s^2
r = radius of curvature (m)