A flexible pavement has a structural number of 3.8 (all drainage coefficients are equal to 1.0). The initial PSI is 4.7 and the terminal serviceability is 2.5. The soil has a CBR of 9. The overall standard deviation is 0.40 and the reliability is 95%. The pavement is currently designed for 1800 equivalent 18-kip single-axle loads per day. If the number of 18-kip single-axle loads were to increase by 30%, by how many years would the pavement’s design life be reduced?

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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A flexible pavement has a structural number of 3.8
(all drainage coefficients are equal to 1.0). The initial
PSI is 4.7 and the terminal serviceability is 2.5. The soil
has a CBR of 9. The overall standard deviation is 0.40
and the reliability is 95%. The pavement is currently
designed for 1800 equivalent 18-kip single-axle loads
per day. If the number of 18-kip single-axle loads were
to increase by 30%, by how many years would the
pavement’s design life be reduced?

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