Multiple choice

The following data pertains to the number of commercial vehicles per day for the design of a flexible pavement for a national highway as per IRC: 37-1984

   
Type of commercial vehicle Number of vehicles per day considering the number of lanes Vehicle Damage Factor
Two axle trucks 2000 5
Tanderm axle trucks 200 6

Assuming a traffic growth factor of 7.5% per annum for both the types of vehicles, the cumulative number of standard axle load repetitions (in million) for a design life of ten years is

  1. 44.6

  2. 57.8

  3. 62.4

  4. 78.7
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Calculate N = 365 * A * [(1+r)^n - 1] / r * F. A = 2000*5 + 200*6 = 11,200. r = 0.075, n = 10. N = 365 * 11200 * [(1.075^10 - 1) / 0.075] = 4,088,000 * 14.147 = 57.8 million.

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