USE OF DYNAMIC ANALYSIS IN PREDICTING FIELD MULTILAYER PAVEMENT MODULI.

The response of a multilayer pavement system to dynamic loading excitations is discussed and compared with the static response. Field Road Rater deflection data previously obtained at the Pennsylvania Transportation Research Facility are used to backcalculate pavement layer stiffnesses using the elastodynamic technique. Sets of layer moduli and fundamental frequencies are developed for five sections of the test track. The amount of error associated with the use of the static analysis commonly used is also evaluated. The dynamic analysis incorporates the inertial effect (radiation damping and resonance) of the pavement structure that cannot be included within static analyses. Simply replacing the Young's modulus in a static analysis by the resilient modulus or the dynamic modulus does not change it to a dynamic analysis.