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)
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)
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)
Bhavya jagyasi said:
10 years ago
If we have to calculate the superelevation for only single vehicle then we use 127 and when we have to calculate superelevation for design speed (for all vehicle which are going to move on curve) we use 225.
Shyamlal said:
5 years ago
Equation for super Elevation:
e+f=v*v/225R(design speed),
So R=v*v/225(e+f),
Take e=0.07 & f=0.15,
R=60*60/225(0.07+0.15),
It get R=72.72m.
So the answer is option D.
ie =60*60/225.
e+f=v*v/225R(design speed),
So R=v*v/225(e+f),
Take e=0.07 & f=0.15,
R=60*60/225(0.07+0.15),
It get R=72.72m.
So the answer is option D.
ie =60*60/225.
Tina said:
7 years ago
e= 0.07 & f= 0.15 (both are constant).
e + f= V^2/127R.
Where: R= radius of horizontal Curve.
R= 60^2/127(0.07+0.15).
R= 128.84m,
Note: here V is in kmph.
e + f= V^2/127R.
Where: R= radius of horizontal Curve.
R= 60^2/127(0.07+0.15).
R= 128.84m,
Note: here V is in kmph.
Manoj kabdwal said:
9 years ago
The e equals v*v/225R put e equation 0.07 find R.
It is 228.57 as this question is saying about design speed so above formula will be used.
It is 228.57 as this question is saying about design speed so above formula will be used.
Sahil Pathania said:
9 years ago
We can use the formula (e+f)=v^2/127R. As curve is horizontal take e=0.
R = 60 * 60/127(0.15) = 189 approx.
Ans is (D) none of these.
R = 60 * 60/127(0.15) = 189 approx.
Ans is (D) none of these.
Sujeet said:
6 years ago
Absoulte min radius=( Vmin)^2/((127)(e(max)+.15).
Here Vmin=60, emax= .07 [7% for plain terrain].
=128.8m.
So, D is correct.
Here Vmin=60, emax= .07 [7% for plain terrain].
=128.8m.
So, D is correct.
Sugumar said:
5 years ago
How can we guess the weather it is a mixed traffic or single traffic. Can anyone explain based on this question?
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