ABSTRACT
Traditionally, static layered elastic analysis analyzes a pavement structure without any discontinuity under peak static load. This paper presents the results of several comprehensive three Dimensional-Finite Element (3D-FE) studies for asphalt highway pavement structures subjected to the Falling Weight Deflectometer (FWD) non destructive dynamic deflection tests. The results provide useful insight into pavement structural responses for un cracked and cracked pavements. This is not possible from traditional static linear elastic analysis or 2D finite element analysis. The use of infinite element with smaller size pavement model needs caution as it significantly decreases peak deflection values. The explicit dynamic analysis results for the FWD dynamic load, considering both system damping and Rayleigh damping, indicate that at a damping ratio of 5%, the damping forces lead to 1 to 9% smaller peak deflections. Additionally, natural frequency analysis and modeling of cracks in pavements and resulting reductions in modulus values are also discussed.
