United States Department of Transportation
i
Implementation and local calibration of the MEPDG transfer functions in Wyoming.
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2015-11-01
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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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