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.
Highlights
Roads are the country’s primary means of cargo transportation
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
The general goal of this work is to analyze the structural condition of a standard pavement used in projects of Brazilian roads with predefined and constant dimensions, changing the tire pressure applied to the pavement used in standard methodology and verifying the effect on the pavement layers through fatigue equations standardized by Department of Transport Infrastructure (DNIT)
Summary
Roads are the country’s primary means of cargo transportation. Over the 1990s and 2000s this modal accounted for over 60% of the total cargo transported in the country (IPEA, 2010). According to a survey conducted by CNT (2012) in approximately 45% of the paved network, evaluating functional pavement conditions, traffic signs and geometry, 46% of the country’s road network show some kinds of pavement deficiency. IPEA (2010) conducted a study to identify bottlenecks and deficiencies of national roads and they concluded it would take 183.5 billion reais in investments to solve the problems and boost the road sector, increasing its efficiency and its impact on the country’s economy. Within this context, it is clear that the country’s economy depends on this modal and that Brazilian roads are in poor conditions. The general goal of this work is to analyze the structural condition of a standard pavement used in projects of Brazilian roads with predefined and constant dimensions, changing the tire pressure applied to the pavement used in standard methodology and verifying the effect on the pavement layers through fatigue equations standardized by DNIT
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