Análise comparativa dos métodos DNER e MeDiNa para o dimensionamento de pavimentos flexíveis

Abstract

One of the main infrastructure problems in Brazil is the deficiency of the network, which is mostly composed of flexible. Although the flow of more than half of the inputs produced in the country depend on this network, it presents visible degradations, characterized by the presence of corrugations and cracks along its entire length. For this reason, the design method used by the National Department of Transportation Infrastructure is becoming increasingly obsolete due to its low level of reliability, since the tends to be overestimated. A great challenge then arises: to design durable that meet the expected flow, providing users with good traffic conditions. Therefore, DNIT has considered the implementation of a new design method, MeDiNa, whose main objective is to design the sidewalk in such a way as to analyze the evolution of defects on the road throughout the proposed design. In this work, a structure by DNIT method was analyzed for a 15-year lifetime and it was found that it would present pathological manifestations in intensities above the tolerable limits for the type of road, in 8.5 years of use. A study of this structure, using the MeDiNa method, demonstrated the need for an increase of approximately 33.3% in its thickness, in order to guarantee the expected. This highlights the need to implement a new design method for flexible structures, since the method currently used does not meet the characteristics of contemporary traffic and vehicles.