Influence of Modeling Assumptions on the Structural Performance of Flexible Airfield Pavements Using FAARFIELD and Demoiselle
Abstract The design of airfield pavements is commonly performed using mechanistic–empirical methods implemented in software tools. Although consolidated, these tools incorporate simplified modeling assumptions that may influence the estimated structural responses. In this context, this study evaluates whether different modeling assumptions affect the structural performance of flexible airfield pavements. Five existing flexible airfield pavement structures, characterized through field deflection testing and backcalculation, were reanalyzed using two software tools based on the Layered Elastic Theory for a 20-year design period. The structures were analyzed by allowing the isolated effect of five modeling variables: subgrade Poisson’s ratio, airfield reference temperature applied to the correction of the asphalt surface layer resilient modulus, bonding conditions between the asphalt surface layer and the granular base, aircraft lateral wander, and probabilistic variability of material properties. Structural performance was evaluated based on the Cumulative Damage Factor (CDF) and the estimated pavement service life. For a common reference structure with a baseline service life of 14.6 years, the variation of modeling parameters produced estimates ranging from 3.2 to 27.8 years, with temperature correction and interlayer bonding condition yielding the greatest reductions. The results highlight the sensitivity of mechanistic–empirical analyses to the adopted assumptions and the importance of a rational evaluation of input parameters in airfield pavement design.