A implantaÃÃo de sistemas de gerÃncia de pavimentos sempre foi um desafio para os ÃrgÃos responsÃveis pela malha rodoviÃria de uma regiÃo. Este desafio torna-se maior ainda quando a implantaÃÃo deste tipo de gerÃncia deve ser aplicada a uma malha de estradas nÃo pavimentadas, tendo em vista a sua maior extensÃo quando comparada Ãs vias com algum tipo de revestimento, e alÃm disso, a escassez de estudos e trabalhos publicados nesta Ãrea dificulta ainda mais a sua aplicaÃÃo prÃtica. O presente trabalho visa contribuir para a estruturaÃÃo de um sistema de gerÃncia de pavimentos (SGP), enfocando a sua primeira etapa, o levantamento de campo, alÃm da posterior anÃlise dos dados obtidos. Tendo como base estudos realizados nos Estados Unidos, como os de Eaton et al. (1987), procurou-se adaptar e inovar novas tÃcnicas de levantamento de campo, visando facilitar a obtenÃÃo dos dados, que devem ser inseridos nos mÃtodos de avaliaÃÃo das condiÃÃes de rolamento de estradas de terra. As estradas AQZ-01, AQZ-02 e AQZ-03, localizadas no municÃpio de Aquiraz, foram as escolhidas para a realizaÃÃo deste estudo, uma vez que, jà foram utilizadas em estudos anteriores que seguiam a mesma linha de pesquisa, a gerÃncia de vias nÃo pavimentadas. Com a conclusÃo deste trabalho, espera-se fechar um ciclo de pesquisa que se iniciou em 2003 com os estudos de Correia (2003), Moreira (2003) e Nunes (2003) e foram retomados em 2006 por Almeida (2006) e Santana (2006), cada qual trabalhando em uma etapa especÃfica de um SGP. Desta forma, à possÃvel a estruturaÃÃo de um SGP direcionado a vias nÃo pavimentadas e que seja aplicÃvel à realidade das estradas cearenses e que possa ser utilizado por ÃrgÃos municipais, auxiliando na gerÃncia da malha de vias nÃo pavimentadas. / The implantation of the management systems has always been a challenge for the functioning parts which are responsible for the roads of a region. Such challenge becomes even bigger when the implantation of this kind of management has to be applied to roads which are not paved. It is important to consider, in this case, the bigger extension when compared with roads with some kind of overlay. We may also consider the scarcity of studies and works published in this area which complicates even more its practical application. The present work aims to contribute for the arrangement of the pavement management system (PMS), focusing its first stage, the field survey, besides the posterior analysis of the data obtained. We have as a basis the research accomplished in the USA as the ones by Eaton et al. (1987), we also tried to adapt and innovate new techniques of field survey, aiming to facilitate the achievement of data which must be inserted in methods of evaluation of the bearing conditions of the unpaved roads. The roads AQZ-01, AQZ-02 and AQZ-03, located in the district of Aquiraz, were chosen for the accomplishment of this research, once they had already been used in previous works which followed the same line of research, the management of unpaved roads. As a conclusion for this work, we hope to close this research cycle which was started in 2003 with the studies of Correia (2003), Moreira (2003) and Nunes (2003) and were recaptured in 2006 by Almeida (2006) and Santana (2006); each of them working at a specific stage of a PMS directed to the unpaved roads and that is applicable to the reality of the roads in Cearà and which can also be used by the municipal organs, helping in the management of the roads in general as well as of the unpaved ones.

Neste trabalho são analisados os Sistemas de Gerência de Pavimentos Urbanos (SGPU) e os Sistemas de lnformação Geográfica (SIG) visando a obtenção de formas com que possam ser aplicados para a compatibilização das atividades de gerência de todas as redes de infra-estrutura pública urbana (pavimento, água, esgoto, telefone, gás, energia elétrica). Desenvolve-se um projeto piloto, utilizando o aplicativo de SIG TransCAD para a gerência de pavimentos sob duas condições: na primeira, através de uma interface com um programa de gerência de pavimentos urbanos já em utilização (URMS, desenvolvido na Universidade do Texas em Austin); na segunda, como plataforma para o desenvolvimento de um novo sistema de gerência de pavimentos, tanto em nível de rede como em nível de projeto. São utilizadas bases de dados para o pavimento e para a rede de água de abastecimento, criadas para a análise de viabilidade da compatibilização da gerência de pavimentos com as atividades de concessionárias de serviços públicos urbanos, a qual confirmou a grande potencialidade do uso dos Sistemas de Informação Geográfica para a gerência integrada e racional da infra-estrutura pública urbana. / This work presents studies about Urban Pavement Management Systems (U-PMS) and Geographic lnformation Systems (GIS) aiming their utilization as a tool for the harmonization of urban infrastructure (pavement, gas, electric power, sewer, water, telephone) maintenance and rehabilitation activities. lt is developed a pilot study using the SIG software called TransCAD for pavement management under two conditions: the first one, through an interface with an already in use pavement management system (URMS, developed at the University of Texas at Austin); the second one, as a framework for the development of a new pavement management system, at network and project levels. Data bases for pavement and water networks are used for analysis of the harmonization of pavement management with other public infrastructure activities, which confirmed the great power of GIS for utilization in a rational and integrated urban infrastructure management system.

Kyoto University (京都大学) / 0048 / 新制・課程博士 / 博士(工学) / 甲第14919号 / 工博第3146号 / 新制||工||1472(附属図書館) / 27357 / UT51-2009-M833 / 京都大学大学院工学研究科都市社会工学専攻 / (主査)教授 小林 潔司, 教授 大津 宏康, 教授 河野 広隆 / 学位規則第4条第1項該当

Un Sistema de Gestión de Pavimentos (SGP) es un instrumento dirigido al personal encargado de la administración de vías, con el fin de apoyar en la toma de decisiones para conservar un óptimo nivel de servicio en los pavimentos. La ausencia de un SGP podría generar una mala selección respecto a la técnica de conservación, un inventario de la red vial desorganizado y un sustento técnico ineficiente para justificar la ejecución de actividades de mantenimiento. La presente investigación propone la aplicación de un SGP con el objetivo de mejorar las operaciones relacionadas a la conservación de vías locales del distrito de Surquillo – Lima, mediante el uso de metodologías de identificación de defectos. Como caso de estudio, se evaluaron los jirones Gonzáles Prada, San Agustín y Luis Varela y Orbegozo, los cuales en conjunto presentan una longitud de 1.41 kilómetros y se encuentran bajo la jurisdicción de la Municipalidad de Surquillo. En dicha evaluación, se registró que 3,996.74 m2 del total de las vías se encuentra en mal estado, a causa de la presencia de fallas funcionales como parcheos, fisuras transversales y huecos. Para la identificación de fallas se usó el índice de condición del pavimento (PCI), índice de rugosidad internacional (IRI) e índice de serviciabilidad presente (PSI). Como resultado, se verificó que los procesos propuestos en nuestro SGP se adaptan adecuadamente a la forma de trabajo en la Municipalidad de Surquillo, pues su aplicación no implica un incremento significativo en el presupuesto aplicado para la realización de dichas actividades. / A pavement management system (PMS) is an instrument aimed to the staff in charge of road administration, in order to support decision-making to preserve an optimum level of service on pavements. The absence of a PMS could lead to a poor selection regarding the conservation technique, a disorganized road network inventory and an inefficient technical support to justify the execution of maintenance activities. This research proposes the application of a PMS with the objective of improving operations related to the maintenance of local roads in Surquillo district – Lima using defect identification methodologies. As a case of study, Gonzales Prada, San Agustín and Luis Varela and Orbegozo shreds were evaluated, which have a total length of 1.41 kilometers and are under the jurisdiction of the Municipality of Surquillo. In this evaluation, it was registered that 3,996.74 m2 of the total road is in poor condition, due to the presence of functional failures such as patches, transverse fissures, and potholes. Pavement condition index (PCI), international roughness index (IRI) and present serviceability index (PSI) were used to identify failures. As a result, it was verified that the processes proposed in this PMS are adequately adapted to the way of working in the Municipality of Surquillo, since their application does not imply a significant increase in the budget applied to carry out these activities. / Tesis

Previous studies show that pavement condition properties are significant factors to enhance road safety and riding experience, and pavements with low quality might have inadequate performance in terms of safety and riding experience. Pavement Management System (PMS) databases include pavement properties for each segment of the road collected by the agencies. Understanding the impact of road characteristics on crash frequency is a key step to prevent crashes. Whereas other studies analyzed the effect of different characteristics such as International Roughness Index (IRI), Rutting Depth (RD), Annual Average Daily Traffic (AADT), this thesis analyzed the effect of Critical Condition Index (CCI) on crash frequency, in addition to the other factors identified in previous studies. Other characteristics such as Percentage of Heavy Vehicles, Road Surface Condition, Road Lighting Condition, and Driver Conditions are taken into the consideration. The scope of the study is the interstate highway system in Fairfax County, Virginia. Negative Binomial, Least Square and Nominal Logistic Models were developed, showing that the CCI value is a significant factor to predict the number of crashes, and that it has different effect for different values of AADT. The result of this study is a substantial step towards developing an integrated transportation control and infrastructure management framework. / Master of Science / Many factors cause crashes in the roads. Although there is a common sense that road characteristics such as asphalt quality are important in terms of road safety, there are few studies that scientifically prove that statement. In addition, asphalt maintenance decisions making process is mainly based on cost benefit optimization, and traffic safety is not considered at the process. The purpose of this study is to analyze crashes and road characteristics related to each crash to understand the effect of those characteristics on crash frequency, and eventually, to build a model to predict the number of crashes at each part of the road. The model can help transportation agencies to have a better understanding in terms of safety consequences of their infrastructure management plans. The scope of this study is the highway interstate system in Northern Virginia. Results suggest that pavement condition has a significant impact on crash frequency.

The research described herein is composed of four major areas of practice. It examines the overall performance of runways and provides tools designed to improve current runway operations and management with particular emphasis on contaminated surfaces. Presented in this thesis is an overview of how to design airport pavements in order to achieve optimal friction by specifically focusing on material selection and construction techniques for rigid and flexible pavements. Rubber buildup and the impact rubber accumulation has on decreasing runway friction, particularly in a range of climatic conditions, is discussed. Four commonly used rubber removal techniques are presented and evaluated. Through this research, an analytical hierarchy process (AHP) decision making protocol was developed for incorporation into airport pavement management systems (APMS). Runway surface condition reporting practices used at the Region of Waterloo International Airport are evaluated and recommendations for improving current practices are identified. Runway surface condition reporting can be improved by removing subjectivity, reporting conditions to pilots in real time, standardizing terminology and measurement techniques, and including runway pictures or sketches to identify contaminant locations where possible. Reports should be incorporated and stored in the APMS. Aircraft braking systems and their effects on landing distances under contaminated conditions are discussed. This thesis presents a proposed solution for monitoring and measuring contaminated runway surfaces and identifying the risks associated with aircraft landing through using the Braking Availability Tester (BAT). Also proposed in this thesis is a testing framework for validating the Braking Availability Tester. The proposed BAT measures interaction between aircraft antiskid braking systems and runway contaminants to determine landing distances more accurately. Finally, this thesis includes a discussion explaining how pavement design, contaminant removal, results from friction tests, and results from the BAT can be incorporated into airport pavement management systems. APMS data can be analyzed to economically optimize and prioritize scheduling of pavement maintenance, preservation and rehabilitation treatments to maintain a high level of service, thereby contributing to runway safety and optimization.

The research described herein is composed of four major areas of practice. It examines the overall performance of runways and provides tools designed to improve current runway operations and management with particular emphasis on contaminated surfaces. Presented in this thesis is an overview of how to design airport pavements in order to achieve optimal friction by specifically focusing on material selection and construction techniques for rigid and flexible pavements. Rubber buildup and the impact rubber accumulation has on decreasing runway friction, particularly in a range of climatic conditions, is discussed. Four commonly used rubber removal techniques are presented and evaluated. Through this research, an analytical hierarchy process (AHP) decision making protocol was developed for incorporation into airport pavement management systems (APMS). Runway surface condition reporting practices used at the Region of Waterloo International Airport are evaluated and recommendations for improving current practices are identified. Runway surface condition reporting can be improved by removing subjectivity, reporting conditions to pilots in real time, standardizing terminology and measurement techniques, and including runway pictures or sketches to identify contaminant locations where possible. Reports should be incorporated and stored in the APMS. Aircraft braking systems and their effects on landing distances under contaminated conditions are discussed. This thesis presents a proposed solution for monitoring and measuring contaminated runway surfaces and identifying the risks associated with aircraft landing through using the Braking Availability Tester (BAT). Also proposed in this thesis is a testing framework for validating the Braking Availability Tester. The proposed BAT measures interaction between aircraft antiskid braking systems and runway contaminants to determine landing distances more accurately. Finally, this thesis includes a discussion explaining how pavement design, contaminant removal, results from friction tests, and results from the BAT can be incorporated into airport pavement management systems. APMS data can be analyzed to economically optimize and prioritize scheduling of pavement maintenance, preservation and rehabilitation treatments to maintain a high level of service, thereby contributing to runway safety and optimization.

O número de concessões rodoviárias tem aumentado em todo o mundo. Somente no Brasil, desde 1995, três etapas de concessão já foram realizadas pelo governo federal. No estado de São Paulo, as concessões estão em sua segunda etapa. Uma das principais justificativas para as concessões rodoviárias é a melhoria da condição dos pavimentos. Sendo assim, este trabalho buscou avaliar os benefícios oriundos da melhor conservação dos pavimentos, em termos da irregularidade longitudinal, diretamente relacionada com os custos de operação dos veículos (custos dos usuários: consumo de combustível, desgaste de pneus, tempo de viagem etc.), comparando com os custos por pagamento de pedágio. Para tanto, foram selecionados, através da análise de cluster, três trechos distintos, de tal forma que se tivesse, pelo menos, um segmento do modelo da ANTT da primeira etapa, um segmento do modelo da ANTT da segunda etapa e um segmento do modelo da ARTESP. Os custos de operação dos veículos foram determinados com uso do software HDM-4 e a análise econômica considerou o Valor Presente Líquido (VPL), a Taxa Interna de Retorno (TIR) e a Relação Benefício/Custo (B/C). As alternativas consideradas na análise simularam as exigências contratuais presentes no programa CREMA e no Programa de Exploração da Rodovia (PER) da ANTT. A condição \"base\" para as análises simulou um cenário limite para intervenção no pavimento, onde a mesma só ocorria com irregularidades muito elevadas. Após a realização das simulações, concluiu-se que o método do VPL era o mais adequado para as análises, pois todos os trechos apresentaram custos aos usuários maiores do que os benefícios observados. Ao se realizar análise complementar, com limites de irregularidade ainda maiores para a condição \"base\", somente o modelo da ANTT da segunda etapa justificou economicamente a concessão, do ponto de vista dos usuários. Conclui-se, portanto, que existem evidências de que as concessões rodoviárias no Brasil não têm melhorado a condição dos pavimentos a ponto de ser justificada economicamente, decorrendo a sugestão para que as próximas concessões acarretem custos de pedágio menores ou apresentem um maior número de obras com impacto significativo na redução do tempo de viagem e no aumento da segurança dos usuários. / The number of road concessions has increased worldwide. Only in Brazil, since 1995, three concession stages have already been carried out by the federal government. In the state of São Paulo, the concessions are in its second stage. One of the main justifications for road concessions is the improvement of pavement condition. Therefore, this study sought to evaluate the benefits of better pavement conservation in terms of longitudinal roughness, directly related to vehicle operating costs (user costs: fuel consumption, tire wear, travel time, etc.), comparing it to toll payment costs. In order to do so, three distinct sections were selected through the cluster analysis, so that there was at least one segment of the ANTT model of the first stage, a segment of the ANTT model of the second stage and a segment of the model of ARTESP. Vehicle operating costs were determined using the HDM-4 software and the economic analysis considered the Net Present Value (NPV), the Internal Rate of Return (IRR) and the Benefit/Cost Ratio (B/C). The alternatives considered in the analysis simulated the contractual requirements present in the CREMA program and in the ANTT Highway Exploration Program (HEP). The \"base\" condition for the analyzes simulated a limit scenario for intervention in the pavement, where it only occurred with very high roughness. After the simulations, it was concluded that the NPV method was the most appropriate for the analyzes, since all the stretches presented costs to users greater than the observed benefits. When performing complementary analysis, with even greater limits of roughness for the \"base\" condition, only the ANTT model of the second stage economically justified the concession, from the users point of view. It is concluded, therefore, that there is evidence that the road concessions in Brazil have not improved the condition of the pavements to the point of being economically justified, suggesting that the next concessions bring lower toll costs or present a greater number of works with significant impact on reducing travel time and increasing user safety.

O número de concessões rodoviárias tem aumentado em todo o mundo. Somente no Brasil, desde 1995, três etapas de concessão já foram realizadas pelo governo federal. No estado de São Paulo, as concessões estão em sua segunda etapa. Uma das principais justificativas para as concessões rodoviárias é a melhoria da condição dos pavimentos. Sendo assim, este trabalho buscou avaliar os benefícios oriundos da melhor conservação dos pavimentos, em termos da irregularidade longitudinal, diretamente relacionada com os custos de operação dos veículos (custos dos usuários: consumo de combustível, desgaste de pneus, tempo de viagem etc.), comparando com os custos por pagamento de pedágio. Para tanto, foram selecionados, através da análise de cluster, três trechos distintos, de tal forma que se tivesse, pelo menos, um segmento do modelo da ANTT da primeira etapa, um segmento do modelo da ANTT da segunda etapa e um segmento do modelo da ARTESP. Os custos de operação dos veículos foram determinados com uso do software HDM-4 e a análise econômica considerou o Valor Presente Líquido (VPL), a Taxa Interna de Retorno (TIR) e a Relação Benefício/Custo (B/C). As alternativas consideradas na análise simularam as exigências contratuais presentes no programa CREMA e no Programa de Exploração da Rodovia (PER) da ANTT. A condição \"base\" para as análises simulou um cenário limite para intervenção no pavimento, onde a mesma só ocorria com irregularidades muito elevadas. Após a realização das simulações, concluiu-se que o método do VPL era o mais adequado para as análises, pois todos os trechos apresentaram custos aos usuários maiores do que os benefícios observados. Ao se realizar análise complementar, com limites de irregularidade ainda maiores para a condição \"base\", somente o modelo da ANTT da segunda etapa justificou economicamente a concessão, do ponto de vista dos usuários. Conclui-se, portanto, que existem evidências de que as concessões rodoviárias no Brasil não têm melhorado a condição dos pavimentos a ponto de ser justificada economicamente, decorrendo a sugestão para que as próximas concessões acarretem custos de pedágio menores ou apresentem um maior número de obras com impacto significativo na redução do tempo de viagem e no aumento da segurança dos usuários. / The number of road concessions has increased worldwide. Only in Brazil, since 1995, three concession stages have already been carried out by the federal government. In the state of São Paulo, the concessions are in its second stage. One of the main justifications for road concessions is the improvement of pavement condition. Therefore, this study sought to evaluate the benefits of better pavement conservation in terms of longitudinal roughness, directly related to vehicle operating costs (user costs: fuel consumption, tire wear, travel time, etc.), comparing it to toll payment costs. In order to do so, three distinct sections were selected through the cluster analysis, so that there was at least one segment of the ANTT model of the first stage, a segment of the ANTT model of the second stage and a segment of the model of ARTESP. Vehicle operating costs were determined using the HDM-4 software and the economic analysis considered the Net Present Value (NPV), the Internal Rate of Return (IRR) and the Benefit/Cost Ratio (B/C). The alternatives considered in the analysis simulated the contractual requirements present in the CREMA program and in the ANTT Highway Exploration Program (HEP). The \"base\" condition for the analyzes simulated a limit scenario for intervention in the pavement, where it only occurred with very high roughness. After the simulations, it was concluded that the NPV method was the most appropriate for the analyzes, since all the stretches presented costs to users greater than the observed benefits. When performing complementary analysis, with even greater limits of roughness for the \"base\" condition, only the ANTT model of the second stage economically justified the concession, from the users point of view. It is concluded, therefore, that there is evidence that the road concessions in Brazil have not improved the condition of the pavements to the point of being economically justified, suggesting that the next concessions bring lower toll costs or present a greater number of works with significant impact on reducing travel time and increasing user safety.

Stochastic analysis provides a rationale for the treatment of uncertainties, founded on the principles of probability theory and statistics, and is concerned with a quantifiable measure of the confidence or the reliability associated with any design process. In this thesis, a stochastic approach is employed in the design of flexible pavement structures, to facilitate the development of safe and reliable pavement structures. The important aspects that have been explored in sufficient detail include the system reliability and global sensitivity analysis, and the spatial and temporal uncertainties that pervade the life of pavements. Chapter 1 of the thesis provides an introduction to the stochastic modelling of flexible pavements and its significance in the present day. Highlighting the need for this study, this chapter also enumerates its objectives and presents an overview of the organization of the thesis. Chapter 2 provides a review of the existing literature of the design of flexible pavements and the approaches adopted to deal with the various sources of uncertainties in a probabilistic setting. The estimation of the uncertainties in fundamental pavement design inputs and their integration into the general performance prediction procedures has become a required component of the modern Mechanistic-Empirical pavement design methodology, which has been described in detail. This chapter also provides the scope of the thesis by identifying the areas of stochastic analysis that have received little attention in the flexible pavement design, which include the effect of spatial variability on the pavement structural responses and the techniques of global sensitivity analysis. Chapter 3 provides a detailed overview of the various methodologies adopted in this thesis to carry out the stochastic modelling of flexible pavements. The fundamental technique adopted for the analysis of reliability is the Monte Carlo Simulation (MCS), which relies upon a numerical/analytical model of the physical system, i.e. the pavement model and a probabilistic description of the design parameters represented by random variables or random fields. The high computational expense associated with the MCS, particularly in the case of random fields, is tackled by the use of meta-models based on the stochastic response surface methodology. The chapter outlines the steps followed to develop the meta-models in the form of Polynomial Chaos Equations (PCEs) and its extension to the Sparse PCE that can conveniently represent the spatial variability of the pavement fields. Chapter 4 deals with the probabilistic modelling of flexible pavements, where the design parameter and model uncertainties are quantified based on the available literature studies. The global sensitivity analysis, which aims to study the impact of the input uncertainty on the variation of a model output (critical pavement responses) through uncertainty propagation, is achieved by the construction of the Polynomial Chaos Equations (PCEs). To implement the global sensitivity analysis in a system reliability framework, a generalized approach based on Bayes’ theorem and the concept of entropy as a sensitivity measure, has been proposed in this chapter. Chapter 5 deals with the characterization of the spatial variability inherent in the pavement layer by employing random fields and analyzing the effect on the pavement responses. The discretization of the random field into a vector of random variables is achieved through the simple Midpoint Discretization and the efficient Expansion Optimal Linear Estimation method. Since the computational effort in stochastic problems is proportional to the number of random variables involved, it is desirable to use a small number of random variables to represent the random field. To achieve this, the principle of transformation of the original random variables into a set of uncorrelated random variables through an eigenvalue orthogonalization procedure is adopted. To further increase the computational efficiency of generating random fields for Monte Carlo Simulation, the variance reduction technique of Latin Hypercube Sampling and the meta-modelling technique using Sparse Polynomial Chaos Equations (SPCEs) are implemented. The primary focus of this chapter is to analyze the influence of the spatial variability of the pavement layer moduli, including its anisotropic characteristics on the pavement structural responses. Chapter 6 focuses on the time-dependent reliability of the pavement structures as they age in service, with due consideration given to degradation of strength with traffic loading. The study is concerned with the fatigue reliability and thereby only the decrease in the asphalt modulus with time is considered as a function of the accumulated damage due to repeated loading, whose uncertainty is determined by the uncertainties of material parameters and the traffic loading. The time-dependent model adopted in this chapter can be quite effortlessly embedded in the Mechanistic-Empirical design framework, and provides a tool to effectively schedule the maintenance of the pavement structure and ensure that the reliability level remains at the desired level for the entire design life of the structure. Chapter 7 summarizes the various studies reported in this thesis and highlights the important conclusions.