Configurations of tire pressure on the pavement for commercial vehicles: calculation of the ‘n’ number and the consequences on pavement performance

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Paulo Boulos Filho
Hélcio Raymundo
Sivanilza Teixeira Machado
Antônio René Camargo Aranha Paula Leite
José Benedito Sacomano

Abstract

Road traffic has a high variety of types of vehicles and cargo transported. One of the main difficulties in pavement design is forecasting the changes in traffic over time and evaluating the comparative deterioration power of the various loads with axle and tire settings and different levels of repetition. The road environment in Brazil, as we know, is the main means of the country's cargo transportation. Throughout the 1990s and 2000s the road modal accounted for over 60% of the total cargo transported in the country leaving the unbalanced Brazilian transport matrix with almost exclusive investments in such means of transportation. According to CNT 2012, which conducted a survey in approximately 45% of the paved network, evaluating the pavement functional conditions, traffic signs and geometry, 46% of the country’s road network has some type of deficiency in the pavement. The goal of this work is to contribute to a better understanding of the complex influence of traffic in the design and service life of the pavement. The load pressure of commercial vehicle tires over the pavement has increased in recent decades. A more apparent effect of this increase in tire pressure would be the change in the pavement- tire contact area which in turn may result in an increase in the contact load between tire and pavement and other harmful effects on the structure. This study aims to determine the effect on the calculation of the N number, or the number of solicitations of the standard axle on the road pavement, measuring the overload as a percentage of the legal load indicated by a scale. In short, we calculate how an increase in the overload percentage in comparison with the allowable load will influence the decrease of the calculated durability of the pavement designed for the highway.

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Author Biographies

Paulo Boulos Filho, Department of Civil Engineering, Paulista University (UNIP)

Technical consultant in Civil Engineering and coordinator of construction. Has experience in the field of Civil Engineering, with emphasis on road engineering, draftsman, paving projects. Degree in Civil Engineering (Paulista University, 2015).

Hélcio Raymundo, Paulista University (UNIP)

He is currently professor at the Paulista University. Has experience in the field of Civil Engineering, with emphasis on public transportation, working mainly in the following areas: management and business. PhD Student in Production Engineering (Paulista University) and Master in Road Transportation (Polytechnic School of the University of São Paulo, 1983)

Sivanilza Teixeira Machado, Paulista University - UNIP

She is currently professor at the Federal Institute of São Paulo, Suzano. Has experience in the field of Logistics and Agricultural Engineering, with emphasis on supply chain management, working mainly in the following areas: transportation, operations management, supply chain, pre-slaughter logistics. PhD Student in Production Engineering (Paulista University).

Antônio René Camargo Aranha Paula Leite, Paulista University (UNIP)

He is currently professor at the Paulista University and coordinator of Civil Engineering graduate course. Has experience in the field of Civil Engineering, with emphasis on structural engineering. PhD in Production Engineering (Paulista University)

José Benedito Sacomano, Paulista University (UNIP)

He is currently professor at the Paulista University. Has experience in the field of Production Engineering, with emphasis on planning, design and control of production systems, working mainly in the following areas: planning, quality, civil engineering, production management and production engineer. PhD and Master in Mechanical Engineering (University of São Paulo – USP, 1990 and 1983)

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