Question

What will be the cumulative number of standard axle load (in msa) needed for the design of pavement as per IRC for the given data?
Commercial vehicles per week = 1265
Design life of pavement = 10 years
Growth rate of vehicles = 5% per year
Vehicles damage factor = 1.2
(Construction of the pavement is expected to be over after 2 years of last count?

• A. 1.09
• B. 0.99
• C. 7.68
• D. 6.97

Answer 1

The correct option is A 1.09

$\text{Traffic count per day, A}=\frac{1265}{7}=\mathrm{180..714}vehicle/day$
$\text{Traffic count after 2 years (A)}=180.714\times (1.05{)}^2=199.237vehicle/day$
$\text{Number of commercial vehicle in design life(N)}=\frac{365\times A\left[\right(1+r{)}^n-1]}{r}\times VDF$
$=\frac{365\times 199.237\left[\right(1+0.05{)}^{10}-1]\times 1.2}{0.05}\times {10}^{-6}msa=1.0976msa$