| This thesis presents the following for the continuum-based finite-layer model: (1) Theoretical basis, (2) Its applicability to evaluate pavement response, and (3) Verification of its predictive capability. The model incorporates important pavement response factors such as the noncircular contact area, complex contact stress distributions (normal and shear), vehicle speed, and viscoelastic material characterization. The proposed method is much more computationally efficient than the moving-load models based on the finite element method. A verification study undertaken to validate the predictive capability of the proposed approach and the ensuing computer program is presented. The verification study includes: (1) Validation (theoretical) using results from ELSYM5, a widely used pavement response model, (2) Laboratory verification using two foam-rubber models, and (3) Full-Scale field verification using two well documented road tests. A very good agreement was observed in all cases. The trends reported in the past field studies such as Penn State University Test Track and Minnesota Road Tests were compared to the predictions made by the model for the strain responses induced by the axle configuration used in the tests. The approach was subsequently used to compute responses of realistic pavements.; The proposed finite-layer approach is an ideal tool to model the viscoelastic behavior of the asphalt concrete layer and to study the effects of vehicle speed and complex tire-pavement interface stresses on pavement response. This thesis also provides three most important design responses for typical thin and thick pavement sections subjected to different loaded areas at two different temperatures. |
