Civil Engineering - GATE Exam Questions - Discussion

7. 

It is proposed to widen and strengthen an existing 2-lane NH section as a divided highway. The existing traffic in one direction is 2500 commercial vehicles (CV) per day. The construction will take 1 year. The design CBR of soil subgrade is found to be 5 percent, Given: traffic growth rate for CV = 8 percent, vehicle damage factor = 3.5 (standard axles per CV), design life = 10 years and traffic distribution factor = 0.75. The cumulative standard axles (msa) computed are

[A]. 35
[B]. 37
[C]. 65
[D]. 70

Answer: Option B

Explanation:

No answer description available for this question.

Arnab said: (Dec 30, 2017)  
CSA(N) = 365*(((1+r)^n)-1))/r)*A*D*F.
= 365*(((1+.08)^10)-1))/.08)*(2500*2)*0.75*3.5 = 69.39 msa.
r = 8%
n = 10 years
A = 2500*2 (Two direction)
D = distribution factor
F = VDF = 3.5.

Option D is correct.

Niva said: (Apr 6, 2018)  
Option B is correct.

Govind Patidar said: (Aug 22, 2018)  
CSA=(365*(((1+r)^n)-1)*A*D*F)/r.

r=8%.
n=10 years.
A=2500*1.08=2700.
D=lane distribution factor.
F=vehicular damage factor.
CSA=(365*(((1+.08)^10)-1)*2700*0.75*3.5)/0.08 = 37.47msa.

So, that option B is correct.

Muneera said: (Feb 7, 2019)  
How A = 2500x1.08?

Sreejith S said: (Jan 28, 2021)  
Option D is correct. I too agree.

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