Civil Engineering - Highway Engineering - Discussion
Discussion Forum : Highway Engineering - Section 1 (Q.No. 41)
41.
The absolute minimum radius of horizontal curve for a design speed 60 km ph is
Discussion:
40 comments Page 1 of 4.
Deepankar said:
4 years ago
For absolute minimum or ruling minimum radius we have to use V^2/127(e+f).
Where, V=speed in KMPH, e=given superelevation or according to given terrain condition (as there is none in this case so we HAVE TO assume plain for which it is 7% or 0.07) f = coefficient of lateral friction( 0.15).
R(absolute minimum)= (60)^2/127(0.07+0.15)= 128.84~129m.
Where, V=speed in KMPH, e=given superelevation or according to given terrain condition (as there is none in this case so we HAVE TO assume plain for which it is 7% or 0.07) f = coefficient of lateral friction( 0.15).
R(absolute minimum)= (60)^2/127(0.07+0.15)= 128.84~129m.
(16)
Sahil said:
2 years ago
The Correct ans is 128.84 m.
In the case of the minimum radius or maximum superelevation, we use: (e+f)=v^2/127*R.
And in the case of the maximum radius or minimum super elevation, we use the design superelevation formula i.e. e=v^2 / 225*R.
In the case of the minimum radius or maximum superelevation, we use: (e+f)=v^2/127*R.
And in the case of the maximum radius or minimum super elevation, we use the design superelevation formula i.e. e=v^2 / 225*R.
(5)
Rashmi said:
6 months ago
Design speed (kmph) : 30 40 50 60 70 80 90 100 110.
Radius in (meter): 40 70 100 150 200 260 320 400 440.
Radius in (meter): 40 70 100 150 200 260 320 400 440.
(4)
Akshay said:
4 years ago
Factor 225 as kph, so answer 72.
Agree @Shyamlal.
Agree @Shyamlal.
(4)
Pooja m said:
5 years ago
Can we use e=(0.75V)*2/gr this formula?
r = (0.75*16.67) * 2/9.81 * 0.07,
r = 227.62.
r = (0.75*16.67) * 2/9.81 * 0.07,
r = 227.62.
(2)
Sanku said:
5 years ago
The right value is 128.84 meter.
(1)
Mallesh said:
5 years ago
A 2-lane horizontal curve in which radius varies from infinite to some finite value R,
constructed in hilly terrain. The radius R of curve was equal to the absolute minimum radius. If the design speed and minimum speed on the curve is 60 kmph and 40 kmph respectively.
Then calculate the length of this horizontal curve.
constructed in hilly terrain. The radius R of curve was equal to the absolute minimum radius. If the design speed and minimum speed on the curve is 60 kmph and 40 kmph respectively.
Then calculate the length of this horizontal curve.
(1)
Pramit said:
9 years ago
Here, the value of V^2/Rg should be under 0.25.
(1)
Arsad Alam said:
7 years ago
Value of radius (R) =226m correct answer. So option (D) right.
Virender paul said:
7 years ago
Answer is in meter so we have to convert the speed in m/s.
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