Abstract
The present work grants a study of technical development under a differentiated aspect where an extra tire was added to the standard double axle recommended by the Brazilian traffic calculation norms. The number N generated a triple axle, and a comparative study was made relating the balance load standardized in Brazilian balance laws for each type of axis and the damage generated on the pavement, measuring the results on a pavement chosen as a model, usually used on Brazilian highways. We verified through computer software, which uses the methodology of the theory of finite elements, supervised by the inspection bodies of the National Department of Transport infrastructure, proving if a larger amount of cargo generates the same damage to the pavement without jeopardizing its useful life, which was initially designed to last ten years.
Highlights
IntroductionSouza (1981) states that pavement is a structure built through layers of various materials of different characteristics of strength and deformability
The standards agreed and accepted by the projects of the National Department of Transport Infrastructure-DNIT and its state representatives according to the Paving Manual - IPR - 719 (2006) or IP-DE-P00/001-Paving Projects of DER/SP, established the standard single axle or double wheels of 80 kN and the contact pressure tire/pavement of 0.56 MPa
The second stage of calculation is the vehicle factor (VF) definition, which allows the determination of the number of axles equivalent to the standard axle from the volume of vehicles with a specific configuration of axles and loads that travel during the design period
Summary
Souza (1981) states that pavement is a structure built through layers of various materials of different characteristics of strength and deformability. This structure presents a high degree of complexity concerning the calculation of stresses and deformations. A highway pavement is a superstructure consisting of a system of layers of finite thicknesses, based on a semi-space considered theoretically as infinite (the infrastructure or foundation ground called a subgrade; IPR-DNIT, 2006). According to NBR (1982), the pavement is a structure built after earthworks, intended to resist and distribute to the subgrade the vertical stresses produced by traffic. Layers of coating, base, sub-base and, reinforcement of subgrade and subgrade, considering from the top to the natural terrain
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