Question

quistion in highway

what is the benefit of Calibration of AASHTO mechanistic-empirical pavement design Software?

could you put a refrence please?

Answer 1

Calibration of the AASHTO Pavement ME Design software involves correlating the measured distresses to the predicted distress from the software. A perfect correlation would have measured Values = predicted values. In the real world there are differences between the measured and predicted values. The standard error of the estimate (SEE or Se) is a measure of these differences, so it is a measure of the accuracy of the model. A smaller SEE value typically, but not always, indicates a more accurate model.

The version of the software that was used top a local calibration is necessary to compare calibration values for different States or in a Region, it could be confusing to make comparison of precision and bias for different versions of the software if the global calibration Values changed. It should be noted that changes in the PMED software do not automatically require recalibration, even if a model in the software changes. If the Agency is not using that pavement type that is being modeled (i.e. like semi-rigid bases in PMED Build 2.2), then there is no need to recalibrate if that is the only change in the software.