Implementation and local calibration of the MEPDG transfer functions in Wyoming.
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Implementation and local calibration of the MEPDG transfer functions in Wyoming.

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    • Abstract:
      The Wyoming Department of Transportation (WYDOT) currently uses the empirical AASHTO Design for Design of

      Pavement Structures as their standard pavement design procedure. WYDOT plans to transition to the Mechanistic

      Empirical Pavement Design Guide (MEPDG) for designing new and rehabilitated highway pavements. As a part of the

      transitioning process, WYDOT has sponsored an implementation project. One part of the implementation project is to

      verify the MEPDG global distress transfer functions and calibrate these functions to local conditions, if determined to

      be necessary. The Wyoming Long-Term Pavement Performance (LTPP) and non-LTPP roadway segments, as well as

      LTPP test section is adjacent states were used for this verification-calibration process.

      As noted above, one objective of the implementation project was to verify or confirm that the MEPDG transfer

      functions and global calibration coefficients derived from NCHRP project 1-40D reasonably predict distresses and

      smoothness in Wyoming. One of the tasks within this project focused on using the Wyoming LTPP test sections to

      confirm the applicability of the global calibration coefficients. Results from the initial verification concluded some of

      the transfer functions exhibited significant bias between the measured and predicted distress and require local

      calibration. Thus, some of the LTPP test sections in adjacent states with similar design features built in Wyoming

      combined with some non-LTPP roadway segments in Wyoming were used to determine the coefficients of the transfer

      functions to eliminate any bias between the measured and predicted distresses.

      This report documents the local calibration of the transfer functions using LTPP and non-LTPP roadway segments. The

      calibration process follows the steps presented in the 2010 AASHTO MEPDG Local Calibration Guide. Local

      calibration coefficients were derived to remove that bias for the rutting, fatigue cracking, and thermal cracking transfer

      functions of flexible pavements, and the faulting and fatigue cracking transfer functions of rigid pavements. The global

      coefficients of the smoothness degradation regression equation for flexible and rigid pavements were also checked for

      their applicability to Wyoming conditions.

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