NonPAS program has been developed for linear and nonlinear analysis of flexible pavements. Developed program allows nonlinear analysis of flexible pavements using the five nonlinear models, including K-θ, Uzan, Uzan-Witczak, NCHRP 1-37A and Bilinear model. Nonlinear Analysis of flexible pavements using these constitutive models provides a more accurate modeling of both fine and coarse granular material behavior. Developed program can analyze a pavement system, including a maximum of 10 layers, which is subjected to a maximum of six circular loads. Developed program allows for calculating the responses at 300 different points in different pavement layers. In order to validate the results of linear and nonlinear analysis, computed responses by NonPAS have been compared with responses obtained from KENLAYER program. Results showed very good agreement between responses, computed with both linear and nonlinear analysis and approved that developed program can be used with high reliability for pavement analysis and design. The study also indicated the NonPAS program is able to calculate near surface responses with higher accuracy than KENLAYER program.
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