Guide for the Local Calibration of the Mechanistic-Empirical by AASHTO

By AASHTO

This booklet offers suggestions to calibrate the Mechanistic-Empirical Pavement layout advisor (MEPDG) software program to neighborhood stipulations, guidelines, and fabrics. It presents the street neighborhood with a state-of-the-practice instrument for the layout of latest and rehabilitated pavement constructions, in line with mechanistic-empirical (M-E) rules. The layout approach calculates pavement responses (stresses, lines, and deflections) and makes use of these responses to compute incremental harm through the years. The process empirically relates the cumulative harm to saw pavement distresses.
Content:
entrance topic
• record of Figures
• checklist of Tables
• Preface
• desk of Contents
• 1. creation
2. Terminology and Definition of phrases
• three. value and Use
four. Defining Accuracy of MEPDG Prediction versions
five. elements of the normal errors of the Estimate
• 6. step by step technique for neighborhood Calibration
7. Referenced files and criteria
Appendix: Examples and Demonstrations for neighborhood Calibration

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Extra info for Guide for the Local Calibration of the Mechanistic-Empirical Pavement Design Guide

Example text

The null hypothesis is as follows: (6-4) where: yMeasured = Measured value, and xPredicted = Predicted value using the model. It is possible that the above hypothesis could be accepted (the sum of the residual errors are indifferent to zero), but the model still be biased. Two other model parameters (termed intercept and slope estimators) should be used to fully evaluate model bias using the following fitted regression model between the measured (y) and predicted (x) values, as well as the variability in the measured value associated with the distributed errors for each predicted value.

1” HMA + 5” HMA + 8” Lime subgrade + subgrade) • 1989. Overlay (¾” overlay + 1” recycle HMA) • 1997. Overlay (3” HMA Overlay) • 1964 New construction. 5” HMA + subgrade) • 1996. Overlay. 5” HMA overlay) • 1996. Reconstruction. (1” HMA + 8”HMA + 6” Lime subgrade + subgrade) • 2000 Overlay. 0” HMA overlay) Section II: • 1965 New Construction. 0” HMA + subgrade) • 1999. 0” recycled HMA) • 2005. 5 2000–2005 A-4 | Guide for the Local Calibration of the Mechanical-Empirical Pavement Design Guide Table A2-1—Continued Table A2-2.

This condition generally requires more runs and a higher level of effort to reduce the bias. 3. The residual errors versus the predicted values exhibit a significant and variable slope that appears to be dependent on the predicted value. The precision of the prediction model is poor and the accuracy is time or number of loading cycles dependent—there is poor correlation between the predicted and measured values. This condition is the most difficult to evaluate because the exponent of the number of loading cycles needs to be considered.

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