From the aspect of mechanistic-empiricial method, the knowing of tire and axle configurations that suply transfer of traffic loading on road, and determining the most critical tire and axle type will make easy to classification and modeling of traffic loading. Thus, in this study, according to field measurements and equivalent single axle loads and being modeled by 3d finite elements, most critical tire and axle type were attempted to determine. Additionaly, in case of decreasing or increasing distance between the dual tires as tire type, it was attempted to determine the effects in the pavement layers by observing the changes of stress-strains. It was concluded that, in the modellings developed according to measurements taken from the heavy vehicles in traffic, generally the most critical tires in terms of horizantal and vertical stresses-strains are respectively: single tire, new wide-base tire, dual tire and super single tire. But, according to the models were developed under the same conditions, the most critical tires in terms of horizantal and vertical stresses-strains caused on the layers of asphalt are respectively: single tire, super single tire, new wide-base tire and dual tire. In terms of axle types especially used by heavy vecihles in traffic, the most critical axles according to the loads in traffic are; steering axle, single axle, tridem axle and tandem axle, respectively. According to the analysis due to the exchange of distance between dual tire; the increasing distance between dual tire significantly reduce vertical stress value about %23, and critical tensile strain value about %32 under the asphalt concrete layer of pavement.
Key Words: Stress-Strain, Mechanistic-Empiricial Design, Tire and Axle Configurations, Finite Elements, Ls-Dyna