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چکیده
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Evaluation of fatigue loading axis passing through the most important factors is mechanistic pavement design methods. Several models in which the number of repetitions to fatigue failure of the pavement time to be presented. In this study, the Institute of asphalt, is used to determine the allowable load repetitions. Many researchers in the analysis of flexible pavements, the circular surface with a uniform stress distribution analysis because of the simplicity in use. Numerous empirical studies reflects the fact that the contact area and the actual distribution time, depending on the type of load and wind Tires are different. In this study, the effect of different makeup axis passing through the pavement of the individual axes, Tandem and Tridem taking into account the different surfaces such as circles, squares, rectangles and ovals, fatigue and flexible pavement responses were evaluated. Analysis of this study was to analyze mechanistic and such that a three-dimensional model of the flexible pavement were analyzed using finite element pavement responses under cross axes in question were calculated with different contact surfaces. In this model, all the layers of elastic behavior intended and tensile strain under a layer of asphalt pavement were studied as a response. The results show that the use of rectangular and elliptical contact surfaces, gives cause less damage than other surfaces. In other words, oval and rectangular surface area estimates more realistic than the contact area is circular and square sought.
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