Análise da influência do aumento de carga por eixo na estimativa do número N de projeto e na vida útil do pavimento em um trecho da avenida NS-15 em Palmas-TO

Abstract

Brazil has a great domain of road transport, and the flexible pavement is a structure designed to resist the tensions and deformations induced by the loads that travel on the highways. The excess load of commercial vehicles directly interferes with the pavement, causing the acceleration of degradation and reduction of its useful life designed. Thus, it is extremely important to analyze the influence of the increase in axle load caused by Law 14.229/21, which updates the gross weight tolerance per axle to 12,5%. This work aims to analyze the influence of the increase in the excess load per axle in the calculation of the N Number and in the useful

life of the pavement, having as object of study a section of Avenue NS-15 in the city of Palmas- TO. For this purpose, the estimated of the N Number, the sizing by the empirical method of the

Departamento Nacional de Infraestrutura de Transportes (DNIT) and the mechanistic-empirical analysis by the MeDiNa program were carried out for different loading configurations with excess load per axle of 5%, 10% and 12.5%. Besadies, the analysis of the influence of the asphalt class on the useful life of the highway under study was carried out with the different loading configurations. Number N, with an excess axle load of 12.5%, had an increase of 49% compared to the one used in the Av project. NS-15, with 5% excess axle load. In the empirical sizing, there was no impact on the pavement structure with the change of excess weight. From the mechanistic-empirical analysis, the pavement with 12.5% showed a reduction of 18 months in comparisson of the use of 5% excess load per axle. With the change in the asphalt class, an increased in the estimated useful life between 33 and 61 months of the scenarios under study was obtained. Therefore, the definition of traffic parameters, as well as the characteristics of the materials, has a great influence on the useful life of a pavement, which highlights the importance of the technical quality of the materials and the traffic study, to ensure that the pavement reaches the objectives, for which it was sized.