MEPDGMechanistic Empirical Pavement Design Guide
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In agreement with Timm, Robbins, Tran, and Rodezno (2014), the MEPDG and the AASHTO Ware Pavement ME Design were created to be modular in a way that new features could be added, exchanged or improved as they became available.
Because current pavement design and analysis tools such as the MEPDG generally use historical climate data sources, a number of new steps are required in the design process to use these tools with future climate parameters.
Therefore, [absolute value of [E.sup.*]] is an important input parameter of MEPDG. Currently, Long-Term Pavement Performance (LTPP) material test database does not include actual test results of [absolute value of [E.sup.*]].
This difference causes engineers significant confusion about how to appropriately input the resilient modulus in the MEPDG software.
The NCHRP1-37A research project team in charge of developing the Mechanistic-Empirical Pavement Design Guide (MEPDG) incorporated the ANN models (Ceylan 2002) in preparing the MEPDG concrete pavement analysis package.
Researchers compared MERRA data against the best available ground-based observations both statistically and in terms of effects on pavement performance as predicted using the MEPDG. Statistical analyses compared data from operating weather stations and MERRA, evaluated the correctness of certain calculations made using the MEPDG, and compared MEPDG-based predictions of pavement performance using weather station data versus MERRA climate data.
According to Hernandez (2010), the procedures recommended by MEPDG and Hu et al.
Rut depth caused by flow rutting is modelled as a function of elastic strain, temperature and the number of loadings, as shown in the MEPDG equation (NCHRP 2004; Oscarsson 2011):
In this context, the overall objective of the Mechanistic-Empirical Pavement Design Guide (MEPDG) is to provide the highway community with a state-of-the-practice tool for the design of pavement structures, based on mechanistic-empirical principles according to the Guide for Mechanistic-Empirical Design of New and Rehabilitated Pavement Structures of 2004.
The performance of rutting for each mixture was evaluated by using the viscoplastic model from the tension test and triaxial compression test proposed by NCHRP 1-37 A MEPDG (AASHTO2004) and the rutting model.
The Mechanistic-Empirical Pavement Design Guide (MEPDG, 2004) is also developed to replace the AASHTO 1993 Guide for the Design of Pavement Structure [13].
The models include those incorporated in the Mechanistic-Empirical Pavement Design Guide (MEPDG) adopted by the American Association of State Highway and Transportation Officials (AASHTO) in 2008, now available under AASHTOWare[TM] as the software program Pavement ME Design.