Transfer functions for pavement responses exceeding the user-specified level for accumulating damage Seasonal resilient moduli of unbound materials and annual COV Seasonal pavement moduli and annual coefficient of variation (COV) In order to predict strains that would prove detrimental for fatigue cracking or structural rutting. Version 4.3 provides design results as percentile responses and as conventional designs with transfer functions. The program couples layered elastic analysis with a statistical analysis procedure (Monte Carlo simulation) to estimate stresses and strains within a pavement. PerRoad is uses the mechanistic-empirical design philosophy. Both versions of the software are available as free downloads. The APA offers two versions of its software for the design and analysis of Perpetual Pavements.
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