Civil Engineering - Highway Engineering - Discussion
Discussion Forum : Highway Engineering - Section 1 (Q.No. 1)
1.
A district road with a bituminous pavement has a horizontal curve of 1000 m for a design speed of 75 km ph. The super-elevation is
Discussion:
96 comments Page 3 of 10.
Tabaamith said:
7 years ago
Convert 75km/hr to m/ sec, which comes 20.85m/sec.
Take velocity as 75% of design speed.
Now, e= (0.75 * 20.85)^2/ 9.81X1000 = 0.024.
In ratio 1/1/0.024 = 1 in 40.
Take velocity as 75% of design speed.
Now, e= (0.75 * 20.85)^2/ 9.81X1000 = 0.024.
In ratio 1/1/0.024 = 1 in 40.
Singh bushan chib said:
8 years ago
It is right 1/40 by using the formula.
Dr. ANUJ said:
6 years ago
This will as per the design steps given by IRC for heterogeneous traffic. Step one is, you have to find the value of e (superelevation) neglecting friction for 75% of design speed.
If the value so obtained is less than 0.07, the design is over and that value is taken as the designed value of superelevation.
If the value so obtained is less than 0.07, the design is over and that value is taken as the designed value of superelevation.
Mayur said:
8 years ago
Use e= (0.75v)^2/gr.
KARA LALA said:
7 years ago
GSB - Granular Sab Base.
WMM - Wet Mix Macadam.
WMM - Wet Mix Macadam.
Sonam phuntsho said:
8 years ago
What is the location of the road is on hilly area?
Yash said:
8 years ago
Already design speed is given, then why it converted again to design speed? Please tell me.
Surafel Belayneh said:
8 years ago
A District road having the mixed traffic condition so speed is reduced by 25%.
Super elevation e = V^2/225 R.
e = 75 * 75/225 * 1000.
= 0.025.
So for 1m,
1/0.025 = 40.
=> 1 in 40.
Super elevation e = V^2/225 R.
e = 75 * 75/225 * 1000.
= 0.025.
So for 1m,
1/0.025 = 40.
=> 1 in 40.
Anwar zaib said:
8 years ago
To determine super elevation we need only f- value, design speed and radius of the curve. So, if it is not mentioned then directly take the value with the unit of distance i.e meter.
the formula for mix traffic.
e + f = V^2/225R
HERE
f = 0 R=1000m and V =75kmph
so
e= 0.025 (1/40).
the formula for mix traffic.
e + f = V^2/225R
HERE
f = 0 R=1000m and V =75kmph
so
e= 0.025 (1/40).
Dev said:
8 years ago
Here it's v^2/127r.
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