Methods of calculating pavement response (forward calculation) include (1) closed-form solutions based on Boussinesq’s original halfspace solution, (2) layered elastic solutions based on Burmister’s original two- and three-layer solutions, and (3) finite element solutions. Each of these is described in the following sections. These can be broken down according to (1) the methods of analysis for calculating pavement response (forward analysis) and (2) the methods for interpretation of pavement response (backcalculation). There are various approaches for FWD data analysis and interpretation. In addition, this chapter includes recommendations on the use of FWD data for mechanistic-empirical pavement design, along with suggestions for future research needs. Flexible pavement modeling issues, such as the effects of temperature and moisture, stiff layer, layer thicknesses and nonlinear, viscoelastic, and dynamic material behavior, are also discussed. This chapter discusses various approaches in FWD data analysis and interpretation for flexible pavements, including a review of common backcalculation programs in terms of their underlying assumptions, required inputs and resulting outputs, overall advantages and disadvantages, and user friendliness. FWD DATA ANALYSIS AND INTERPRETATION-FLEXIBLE PAVEMENTS Using Falling Weight Deflectometer Data With Mechanistic-Empirical Design and Analysis, Volume I: Final ReportĬHAPTER 4.
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