GATE Papers >> Civil >> 2019 >> Question No 144

Question No. 144 Civil | GATE 2019

A flexible pavement has the following class of loads during a particular hour of the day.

 i. 80 buses with 2-axles (each axle load of 40 kN);

ii. 160 trucks with 2-axles (front and rear axle loads of 40 kN and 80 kN, respectively)

The equivalent standard axle load repetitions for this vehicle combination as per IRC:37- 2012 would be

Answer : (A) 180

Solution of Question No 144 of GATE 2019 Civil Paper

Standard axle load = 80kN

$ \begin{array}{l}\mathrm{Equivalent}\;\mathrm{standard}\;\mathrm{axle}\;\mathrm{load}=280\times\left(\frac{40}{80}\right)^4+160\times\left(\frac{40}{80}\right)^4+160\times\left(\frac{80}{80}\right)^4\\\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;=160\times\left(\frac12\right)^4+160\times\left(\frac12\right)^4+160\times1^4\\\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;=20+160=180\end{array} $

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