Civil Engineering - Surveying - Discussion
Discussion Forum : Surveying - Section 2 (Q.No. 27)
27.
If the sight distance (S) is equal to the length of the vertical-curve (2l) joining two grades g1% and - g2%, the height of the apex will be
none of these.
Discussion:
9 comments Page 1 of 1.
Akhilesh Yadav said:
9 years ago
The Main formula.
L={(g1% -g2%)S^2}/(800 h).
But in this question.
Length of the vertical curve (L)=2l.
And, S=2l.
Then
h = {(g1% -g2%)(2l)^2}/(800 * 2l).
h = {(g1% -g2%)l}/400.
L={(g1% -g2%)S^2}/(800 h).
But in this question.
Length of the vertical curve (L)=2l.
And, S=2l.
Then
h = {(g1% -g2%)(2l)^2}/(800 * 2l).
h = {(g1% -g2%)l}/400.
(3)
Shekhar pali said:
5 years ago
The formula is s(g1% - g2%)/200(√h1 + √h2)^2.
S= minimum sight distance.
g = gradient.
h1 = height of driver.
h2= height of the obstruction.
S = (√h1 +√h2) = 2l.
= 2l(g1% - g2%)/200(2l)^2.
= (g1% - g2%)/400 l.
S= minimum sight distance.
g = gradient.
h1 = height of driver.
h2= height of the obstruction.
S = (√h1 +√h2) = 2l.
= 2l(g1% - g2%)/200(2l)^2.
= (g1% - g2%)/400 l.
(3)
Gaurang chauhan said:
8 years ago
I think it's option D none of these.
(2)
Sushil said:
8 years ago
How 800? Please explain clearly.
(2)
Sopan said:
6 years ago
How 800? Please explain clearly.
(1)
John said:
4 years ago
D should be the correct answer.
(1)
Windy said:
9 years ago
Can anyone explain it?
Balkrishna Jha said:
2 months ago
@Windy.
Y= (g1+g2)×(L/2)^²/2 × 2L.
= (g1+g2)×L/8
Y= (g1+g2)×(L/2)^²/2 × 2L.
= (g1+g2)×L/8
Balkrishna Jha said:
2 months ago
Equation of summit curve:
y = Nx²/2L.
N = (g1 -(-g2)),
x = L/2,
L = 2L.
Height of apex.
Y = [(g1-(-g2))×(L/2)²]/2×2L.
= [(g1+g2)×L]/8.
y = Nx²/2L.
N = (g1 -(-g2)),
x = L/2,
L = 2L.
Height of apex.
Y = [(g1-(-g2))×(L/2)²]/2×2L.
= [(g1+g2)×L]/8.
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