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:
95 comments Page 3 of 10.
MANISH CHANDEL said:
8 years ago
e=v^2/225*R is correct.
Sarath chandra said:
10 months ago
When shall we need to consider the speed in terms of metres per second? Please explain to me.
DJ.thakur said:
8 years ago
For design of superelevation on road:-
(1)- design superelevation for 75% of design speed. (Hence s.e. resists 75% of centrifugal force rest is balanced by road friction)
(1)- design superelevation for 75% of design speed. (Hence s.e. resists 75% of centrifugal force rest is balanced by road friction)
Haroon said:
8 years ago
e+f=v^2/gr, v in m/s.
e+f=v^2/127r, v in km/h.
For 75% of design speed f=0,as per irc.
e=(0.75v)^2/127r =v^2/225r.
e=75*75/(225*1000)=0.025=1:40.
e+f=v^2/127r, v in km/h.
For 75% of design speed f=0,as per irc.
e=(0.75v)^2/127r =v^2/225r.
e=75*75/(225*1000)=0.025=1:40.
Anmol said:
7 years ago
It's we have already given the design speed so we will use v2/127r.
Dev said:
7 years ago
Here it's v^2/127r.
Anwar zaib said:
7 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).
Surafel Belayneh said:
7 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.
Yash said:
7 years ago
Already design speed is given, then why it converted again to design speed? Please tell me.
Sonam phuntsho said:
7 years ago
What is the location of the road is on hilly area?
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