Abstract
This paper describes a method for evaluating a structural capacity of an asphalt pavement with falling weight deflectometer deflection data. A back-analysis was used to estimate in situ elastic moduli of a granular subbase and a subgrade in the pavement. A tensile strain at a bottom of the asphalt layer and a compressive strain in the subgrade surface under the standard wheel load were calculated with the BISAR. A number of allowable loading repetition corresponding to the tensile strain and the compressive strain were estimated with an asphalt strain criteria and a subgrade strain criteria obtained by many researchers.The asphalt strain criteria was very useful imformation for a theoretical design method on asphalt pavements and overlay design, because there was a correlation between the cracking data and asphalt strain criteria in the national highway 337.
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