Civil Engineering - Highway Engineering - Discussion
Discussion Forum : Highway Engineering - Section 1 (Q.No. 5)
5.
The total length of a valley formed by two gradients - 3% and + 2% curve between the two tangent points to provide a rate of change of centrifugal acceleration 0.6 m/sec2, for a design speed 100 km ph, is
Discussion:
30 comments Page 1 of 3.
Farouq algradi said:
12 months ago
L = 2 * √(N * (V^3)/c)
N = |N2-N1| = |-0.03-0.02| = |-0.05|
= 0.05.
V = 100kmph = 100 * 1000/(60*60)
= 27.7m/s.
L = 2 * √(0.05*(27.7^3)/0.6),
= 84.52m.
N = |N2-N1| = |-0.03-0.02| = |-0.05|
= 0.05.
V = 100kmph = 100 * 1000/(60*60)
= 27.7m/s.
L = 2 * √(0.05*(27.7^3)/0.6),
= 84.52m.
(5)
Shubham said:
2 years ago
For c = 0.6
L=0.38√(NV^3)
Where v is in kmph.
So, here;
L = 0.38*(5*1000000)^0.5.
L=0.38√(NV^3)
Where v is in kmph.
So, here;
L = 0.38*(5*1000000)^0.5.
(12)
Sangla bagang said:
3 years ago
It should be option D. 84.54m only satisfies the comfort criteria, and the actual length of the curve should satisfy min. So, the sight distance criteria i.e 210.21m.
(2)
Prince said:
4 years ago
Both the gradients are positive so it should be subtracted right?
(3)
Shaguftasultana said:
6 years ago
N=|-3-2|=5,
L=2* {(Nv^3)/C},
=2* 5*(100/3.6)/0.6,
= 84.57.
L=2* {(Nv^3)/C},
=2* 5*(100/3.6)/0.6,
= 84.57.
(10)
Shahbaz Bashir said:
7 years ago
N is the difference between raising gradient and falling gradient i.e N = n1 - n2 and also falling gradient = negative (-) similarly raising gradient =positive (+).
(1)
David Bielstein said:
8 years ago
I thought the centrifugal acceleration at the beginning of a parabolic curve would be 0 m/sec^2, increasing to the maximum acceleration at the point directly above or below the PI, and then back to 0.
Is 0.6 m/sec^2 assumed to be the maximum instantaneous centrifugal acceleration?
Is 0.6 m/sec^2 assumed to be the maximum instantaneous centrifugal acceleration?
(2)
VAMSI said:
8 years ago
Answer is C.
(1)
SANDI said:
8 years ago
L = 2X(NV3/C)^.5,
N = .05,
V = 27.78,
L = 84.498.
N = .05,
V = 27.78,
L = 84.498.
(1)
Dame abebe said:
8 years ago
Yes, L =84.60 so option "C" is the answer.
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