Дисертації з теми "Pavement roughne"
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Rawool, Shubham Shivaji. "Development of methodology for detection of defect locations in pavement profile." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/2440.
Повний текст джерелаKhavassefat, Parisa. "Vehicle-Pavement Interaction." Doctoral thesis, KTH, Väg- och banteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156045.
Повний текст джерелаQC 20141119
Hanson, Jon Russell. "Cracking and roughness of asphalt pavements constructed using cement-treated base materials /." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1233.pdf.
Повний текст джерелаHu, Fengxuan. "Development and evaluation of an inertial based pavement roughness measuring system." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001641.
Повний текст джерелаOnuorah, Chinedum Anthony. "Evaluation of pavement roughness and vehicle vibrations for road surface profiling." Thesis, University of Hertfordshire, 2018. http://hdl.handle.net/2299/21107.
Повний текст джерелаOnuorah, Chinedum Anthony. "Evaluation of pavement roughness and vehicle vibrations for road surface profiling." Thesis, University of Hertfordshire, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.756584.
Повний текст джерелаFelker, Victoria. "Characterizing the roughness of Kansas PCC and Superpave pavements /." Search for this dissertation online, 2005. http://wwwlib.umi.com/cr/ksu/main.
Повний текст джерелаSrinivasan, Sriram. "Development of a Cost Oriented Grinding Strategy and Prediction of Post Grind Roughness using Improved Grinder Models." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/78298.
Повний текст джерелаMaster of Science
Hunt, Philip Duncan. "Analysis of roughness deterioration of bitumen sealed unbound granular pavements for use in road asset management modeling." Thesis, Queensland University of Technology, 2002. https://eprints.qut.edu.au/36178/1/36178_Hunt_2002.pdf.
Повний текст джерелаWaters, Tenli. "Typical and Darkened Portland Cement Concrete Pavement: Temperature, Moisture, and Roughness Analyses." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/6091.
Повний текст джерелаMalmedahl, Grant Anders. "A method for the characterization of off-road terrain severity." Connect to resource, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1182978485.
Повний текст джерелаNg, Vincent Laphang. "A Study of Deterioration in Ride Quality on Ohio's Highways." University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1430322756.
Повний текст джерелаHanson, Jonathan Russell. "Cracking and Roughness of Asphalt Pavements Constructed Using Cement-Treated Base Materials." BYU ScholarsArchive, 2006. https://scholarsarchive.byu.edu/etd/396.
Повний текст джерелаElghriany, Ahmed F. "Investigating Correlations of Pavement Conditions with Crash Rates on In-Service U.S. Highways." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1448454032.
Повний текст джерелаHuang, Wen Stroup-Gardiner Mary. "Transferring Alabama's smoothness specificaitons from PI-based to IRI-based." Auburn, Ala., 2006. http://hdl.handle.net/10415/1319.
Повний текст джерелаCummings, Patrick. "Modeling the Locked-Wheel Skid Tester to Determine the Effect of Pavement Roughness on the International Friction Index." Scholar Commons, 2010. https://scholarcommons.usf.edu/etd/1604.
Повний текст джерелаFelix, Daniela Bonina Clemente. "Avaliação da metodologia do USACE aplicada à análise das condições de rolamento dos pavimentos de concreto armado." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/3/3138/tde-09022009-143228/.
Повний текст джерелаThis research aimed to verify types and possible causes for the occurrence of distresses in reinforced concrete pavements as well as to verify the applicability and critically examine the methods for assessment of the functional condition for such pavements. It is presented the distresses types and its severity levels described by the method of the United States Corps of Engineers (USACE), as well as the methods for surface evaluation of concrete pavements, including the international roughness index (IRI), the quarter of car index (QI), the present serviceability ratio (PSR) and subjective and objective evaluation of the pavement condition index (PCI). The practice study focused in four cases of reinforced concrete pavements, an urban pavement and three industrials floors, consisting on detailed field evaluation of distresses with subsequent determination of PCI for several pavement sections. It was carried out a field measurement of IRI using an inertial profiler for the case of urban pavement, in order to verify whether this method could reflect the actual the performance of reinforced pavement concrete. The performed surveys allowed understanding that most of cases with low PCI values are due to constructive fails. The list of distresses suggested by PCI manual is suffice to identify the distresses found out during the surveys. However it shall be required a large amount of field surveys in order to define better correlation between PCI and IRI in view of the current results.
Ďuriš, Samuel. "Měření nerovností povrchů vozovek." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-414305.
Повний текст джерелаMohagheghi, Ali. "Effect of Pavement Condition on Traffic Crash Frequency and Severity in Virginia." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/100129.
Повний текст джерелаMaster 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.
Wilson, Bryan T. "Strength and Deformation Characteristics of a Cement-Treated Reclaimed Pavement with a Chip Seal." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2612.
Повний текст джерелаAdinegoro, Yusuf. "Using instrumented motorcycle data to study road factors influencing motorcycle crash risk." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/121454/1/Yusuf_Adinegoro_Thesis.pdf.
Повний текст джерелаCalkins, Reed. "PERFORMANCE OF THE CRACK, SEAT, AND OVERLAY REHABILITATION TECHNIQUE FOR CONCRETE PAVEMENTS IN CALIFORNIA." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/528.
Повний текст джерелаKosgolla, Janaka Vishwanath. "Numerical Simulation of Sliding Friction and Wet Traction Force on a Smooth Tire Sliding on a Random Rough Pavement." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4345.
Повний текст джерелаGašparík, Michal. "Měření nerovností povrchů vozovek geodetickými metodami." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-390172.
Повний текст джерелаBulevičius, Matas. "Kelių tampriosios dangos konstrukcijų savybių įtaka jų viršutinio sluoksnio eksploataciniams rodikliams." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140225_135207-30096.
Повний текст джерелаThe aim of the dissertation is based on the properties of flexible road pavement structures to develop a mathematical models for predicting the performance of wearing courses used in the pavements of the main roads. The main tasks of the dissertation are as follows: to analyze the main factors influencing the service indices of asphalt concrete pavements and to determine their reasons; to investigate the quality of materials and mixtures used in pavement structural layers of the main roads; to determine the interaction between asphalt concrete pavement composition and the quality indices of mixture materials; to study regularities of the change in pavement roughness and rut depth; to determine the interaction between the quality indices of materials used in pavement structural layers; to select two rational flexible pavement structures for the main roads (for the different traffic volume). The dissertation consists of introduction, four chapters, general conclusions, the list of references and the list of author’s publications on the topic of the dissertation, addenda. Introduction describes the studied problem, topicality of the problem, the object of research, also the aim and tasks, research methodology, scientific novelty, practical value of the results and the defended propositions. Chapter 1 gives the analysis of scientific researches made by different countries in the field of the performance of asphalt concrete pavements and their structures, duration of their... [to full text]
Bulevičius, Matas. "Influence of the properties of flexible road pavement structure on the service indices of wearing courses." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140225_135355-45620.
Повний текст джерелаDisertacijos tikslas – parengti magistralinių automobilių kelių asfaltbetoninės dangos eksploatacinių rodiklių prognozės matematinius modelius, atsižvelgiant į tampriosios dangos konstrukcijos savybes ir transporto priemonių (TP) eismo intensyvumą (EI). Darbe iškelti šie svarbiausieji uždaviniai: išanalizuoti automobilių kelių asfaltbetoninės (AB) dangos eksploatacinius rodiklius lemiančius svarbiausius veiksnius ir atskleisti šių rodiklių blogėjimo priežastis; atlikti magistralinių kelių dangos konstrukcijų (KDK) sluoksniams naudojamų medžiagų kokybės rodiklių tyrimus; nustatyti AB dangos komponentinės sudėties, fizinių bei mechaninių rodiklių ir AB mišiniams naudojamų medžiagų kokybės rodiklių sietį; ištirti AB dangos lygumo ir provėžų gylio kitėjimo dėsningumus; nustatyti AB dangos, kitų (KDK) sluoksnių medžiagų kokybės rodiklių sietį; parinkti dvi racionalias magistralinių kelių tampriosios dangos konstrukcijas (skirtingam TP eismui). Disertaciją sudaro įvadas, keturi skyriai, rezultatų apibendrinimas, naudotos literatūros ir autoriaus publikacijų disertacijos tema sąrašai ir priedai. Įvade aptarta tiriamoji problema, darbo aktualumas, tyrimų objektas, darbo tikslas ir uždaviniai, tyrimų metodika, darbo mokslinis naujumas, darbo rezultatų praktinė vertė ir ginamieji teiginiai. Pirmajame skyriuje išnagrinėti įvairių šalių mokslininkų atlikti automobilių kelių asfaltinės dangos bei jos konstrukcijos eksploatacinių rodiklių ir jų funkcionavimo trukmės tyrimai. Antrajame... [toliau žr. visą tekstą]
Pontes, Carlos Andre Melo. "AnÃlise da EvoluÃÃo de Defeitos de SuperfÃcie em Trechos da Malha RodoviÃria do Estado do CearÃ." Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=7704.
Повний текст джерелаDue to the large predominance of the transportation by highways in Brazil, it is necessary to control the actions related to maintenance and conservation of the roads. With this purpose, institutions make use of modern computational systems, such as the DER/CE, which uses the ISMA (Integrated System of Maintenance Administration). The referred system, using the subsystem PMS (Pavement Management System), has a large database related to the roads condition, filled with data provided by surveys that bring periodically up to date information of the state roads. These data are acquired by using methodologies defined by the technical staff of the DER/CE, based on the following normalized procedures: Visual Continuous Survey (LVC) and International Roughness Index Survey (IRI). The first one evaluates the comfort of the traffic rolling and the second registers the surface distresses of the roads. This research presents a comparative analysis between LVC and IRI data, evaluating the evolution of the distresses and the methodologies and equipments involved in the procedures. It is expected that, with the contribution of this research, the methodologies and road related data be analyzed considering the limitations of the equipments and procedures.
Garbin, Patrícia Theodorovski. "Quantificação das solicitações dinâmicas de veículos rodoviários de carga sobre os pavimentos através do programa Trucksim." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18143/tde-10102014-172418/.
Повний текст джерелаThe development of new techniques for design, construction and management of pavements requires the knowledge of the dynamic effects associated to vehicle-track interactions, which depends on the pavement roughness and vehicle characteristics, such as the spacing between axles, the operational speed, characteristics of suspension, the tire inflation pressure and wheel type of rear axle (dual or single). The main goal of this research is quantifying the dynamic stresses of road freight vehicles on the pavements, by using the computer program TruckSim, and aims to quantify the effects of the factors: axle load, vehicle type, vehicle speed and longitudinal roughness on the pavement performance. The results show that the dynamic effects, particularly when the pavements are in poor condition (IRI greater than 4), have the potential to intensify the forces acting on the road up to 280%, considering an overload of 7.5%, which is the tolerance established by Brazilian law, and that in global effects it can reduce the service-life of a pavement up to 87%.
Barella, Rodrigo Maluf. "Contribuição para a avaliação da irregularidade longitudinal de pavimentos com perfilômetros inerciais." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3138/tde-31032008-172407/.
Повний текст джерелаThis research includes de analysis of several aspects regarding longitudinal pavement roughness evaluation, more specifically when these evaluations are done using an inertial profiler - kind o equipment that is also an object of this study. The analysis is initiated with the comprehension of the historical evolution of this type of functional evaluation that not only encloses equipment, but also the methods and the roughness indexes more common in Brazil. The main stages throughout of the development of the inertial profiler used on this research, its technical and operational features, the results of the tests that proved its good functionality and also the comparison of the results obtained with a response type roughness meter were incorporated. The research is completed with a series of analysis regarding the methods more appropriate for the verification of inertial profilers functioning, including important recommendations for the choice and measurement of reference profiles, indispensable in such verifications. Important aspects concerning profiles processing for the QI determination were verified and concluded for reduction of the displacement between the profile elevations for 25 cm. The uncertainties of QI and IRI indexes obtained from inertial profiles measurements were also researched and at this opportunity it was verified that value of QI is affected by long wavelengths that usually are not considered roughness. The correlation between QI and IRI indexes were widely evaluated using real data of hundreds of kilometers of highways profiles, and evidenced the existence of a great dispersion in such correlation what indicates that the best recommendation is not to correlate them. Finally, this research leaves as a legacy the proposal of a first draft for a Brazilian standard for this type of roughness evaluation that accumulates most of the judgments presented here.
Davis, Lloyd Eric. "Heavy vehicle suspensions : testing and analysis." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/34499/1/Lloyd_Davis_Thesis.pdf.
Повний текст джерелаBisconsini, Danilo Rinaldi. "Avaliação da irregularidade longitudinal dos pavimentos com dados coletados por smartphones." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18143/tde-18072016-104745/.
Повний текст джерелаThe longitudinal pavement roughness affects the rolling quality, increases Vehicle Operating Costs (VOC) and reduces the pavement life. Several instruments have been developed for measuring longitudinal pavement roughness. However, there are conflicts involving different classes of equipment with respect to accuracy, costs and productivity, which complicate the continuous data collection, important for the Pavement Management Systems (PMS). Recently, some studies started to link longitudinal pavements roughness to the signals provided by motion sensors (accelerometers) and GPS (Global Positioning System) pre-installed on smartphones, due to its low cost, simple operation and high productivity. However, there are still doubts about the quality and the form of application of such data. In this study, vibration and field tests were performed with smartphones, in three pavement sections with different levels of roughness (low, medium and high), in which vertical acceleration signals were measured by a smartphone attached to a vehicle dashboard, traveling at different speeds. With these data, RMSVA values (Root Mean Square Vertical Acceleration) were calculated, which were compared with longitudinal pavement roughness, measured in IRI (International Roughness Index) through the Level and Rod method. The tests showed to be the data acquisition rate of smartphones the main factor affecting its application for the evaluation of longitudinal roughness of pavements. When considering all roughness ranges measured, RMSVA statistics showed a positive correlation with IRI, with correlation coefficients (R) between 0.97 and 0.99 and acceptable repeatability for network-level surveys, with average coefficient of variation of 3 to 6%. As indicated in related research, it was concluded that smartphones are a viable alternative for the evaluation of longitudinal pavements roughness, especially in countries with investment restrictions in the highway segment, if the data are collected and explained properly.
Ferreira, Maria Clara Schuwartz. "Influence de particules non-érodables dans le processus d'érosion éolienne." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S012/document.
Повний текст джерелаWind erosion process can lead to several environmental consequences: desertification, land degradation, air pollution, etc. This last one is related to particulate matter emissions from granular materials commonly found on industrial sites, such as ore and coal. The particle size distribution of these granular materials usually consist of a mixture of a wide range of diameters, which include larger particles that are non-erodible even with strong gusts of wind. The non-erodible particles play a protective role for erodible particles, paving the surface and reducing emissions. The main objective of this thesis is to estimate more accurately emissions due to wind erosion considering the influence of the pavement caused by non-erodible particles. An analytical model was proposed to quantify emissions from particle beds and stockpiles with a wide size distribution. The effects of pavement process are incorporated in the model through the decrease of the mean friction velocity on the erodible surface as the non-erodible particles accumulate. Previous works have defined a mathematical relation between the evolution of the friction velocity over the erodible surface and the geometry of the roughness elements. Nonetheless, the formulation was only valid to limited cover rates of non-erodible particles. Numerical simulations were carried out in this work to extend the formulation in order to include other cases encountered in real situations (with larger amounts of non-erodible particles). The proposed emission model describes the relationship between the minimum value of friction velocity (at which emissions cease), taking advantage of the numerical findings, and the final eroded depth of the bed, which in turn, provides the emitted mass. Wind tunnel experiments were carried out in order to better understand the pavement phenomenon and estimate emissions from a bed of particles containing a bimodal size distribution. The experimental results were also used to validate the modeling, including the global emitted mass and the final characteristics of the bed surface. A good agreement was found between experimental and modeled results for the global emissions and the bed eroded depth. The erosion model was extended for application in stockpiles. In this case, the erodibility of the particles is more complex as the friction velocity and the threshold conditions are not spatially homogeneous. The idea of the model was to subdivide the pile in isosurfaces in which the threshold conditions and the friction velocity are constant and then treat each one of these areas as a different source where the emission model can be applied. Wind tunnel experiments were carried out in order to estimate emissions from a sand pile containing a bimodal size distribution. The modeled and the experimental results were compared for the configuration of an isolated stockpile and a good agreement was found between the estimated and the measured emitted mass. The impact of the presence of a building and a successive parallel stockpiles on the overall particles emission was also evaluated. Wind tunnel experiments and numerical simulations were carried out for several configurations evaluating the effects of: (i) main wind flow orientation, (ii) wind flow velocity, (iii) gap between the obstacle and (iv) amount of non-erodible particles. It was found that the flow interferences between the obstacles increase emissions. Therefore, all wind perturbations have a significant impact and have to be accounted in dust emission estimation and modeling
O processo de erosão eólica pode levar a várias consequências ambientais: desertificação, degradação da terra, poluição do ar, etc. Esta última está relacionada com as emissões de partículas provenientes de materiais granulares comumente encontrados em indústrias, como minério e carvão. A distribuição granulométrica destes materiais normalmente consiste em uma mistura com uma ampla gama de tamanhos, incluindo partículas maiores que não são erodíveis mesmo com fortes rajadas de vento. As partículas não erodíveis desempenham um papel protetor para as partículas erodíveis, pavimentando a superfície e reduzindo as emissões. O objetivo principal desta tese é estimar com maior acurácia as emissões devidas à erosão eólica considerando a influência da pavimentação causada pelas partículas não-erodíveis. Um modelo analítico foi proposto para quantificar as emissões de leitos de partículas e pilhas com ampla distribuição granulométrica. Os efeitos do processo da pavimentação são incorporados no modelo por meio da diminuição da velocidade de fricção média na superfície erodível à medida que as partículas nãoerodíveis se acumulam. Trabalhos anteriores definiram uma relação matemática entre a evolução da velocidade de fricção na superfície erodível e a geometria dos elementos rugosos. No entanto, a formulação é válida apenas para limitadas taxas de cobertura de partículas não-erodíveis (< 12%). Simulações numéricas foram realizadas neste trabalho para estender a formulação de modo a incluir outros casos encontrados em situações reais (com maiores quantidades de partículas nãoerodíveis). O modelo de emissão proposto descreve a relação entre o valor mínimo da velocidade de fricção (para qual as emissões cessam), utilizando os resultados numéricos, e a profundidade final erodida do leito, que, por sua vez, fornece a massa emitida. Experimentos em túnel de vento foram realizados para melhor compreender o fenômeno da pavimentação e estimar as emissões de um leito de partículas contendo uma distribuição granulométrica bimodal. Os resultados experimentais foram também utilizados para validar a modelagem, incluindo a massa global emitida e as características finais da superfície do leito. Uma boa concordância foi encontrada entre os resultados experimentais e modelados para as emissões globais e a profundidade erodida do leito. O modelo de erosão foi estendido para aplicação em pilhas de estocagem. Neste caso, a erodibilidade das partículas é mais complexa, uma vez que a velocidade de fricção e as condições de limiar não são espacialmente homogêneas. A ideia do modelo é subdividir a pilha em isosuperfícies em que as condições de limiar e a velocidade de fricção são constantes e, em seguida, tratar cada uma dessas áreas como uma fonte diferente onde o modelo de emissão pode ser aplicado. Foram realizados ensaios experimentais em túnel de vento para estimar as emissões de uma pilha de areia contendo uma distribuição de tamanho bimodal. Os resultados experimentais e modelados foram comparados para a configuração de uma pilha isolada (orientada 60 e 90° em relação a direção do escoamento) e uma boa concordância foi encontrada entre a massa estimada e a emitida. O impacto na emissão da presença de um edifício e de uma pilha de estocagem sucessiva também foi avaliado. Experimentos em túnel de vento e simulações numéricas foram realizados para várias configurações avaliando os efeitos de: (i) orientação do vento, (ii) velocidade do vento, (iii) espaçamento entre os obstáculos e (iv) quantidade de partículas não erodíveis. Verificou-se que as interferências do escoamento entre os obstáculos aumentam as emissões. Portanto, todas as perturbações no escoamento têm um impacto significativo e devem ser contabilizadas na estimativa e modelagem de emissões de partículas
Soncim, Sérgio Pacífico. "Desenvolvimento de modelos de previsão de desempenho de pavimentos asfálticos com base em dados da rede de rodovias do Estado da Bahia." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/18/18143/tde-26072011-101938/.
Повний текст джерелаThe objective of this thesis was to develop performance prediction models for asphalt pavements in the State of Bahia. The performance models were developed for hot-mix asphalt (HMA) and double surface treatment (ST). Information was obtained from a database maintained by DERBA (State of Bahia Department of Transportation), with data collected in 2004, and from additional collection of data, mainly of pavement roughness, performed in 2009 and that was based on an experimental design for this specific purpose. Two statistical analyses were used to assess the significant factors and define the parameters of the performance models: Exploratory Data Analysis (EDA) and Analysis of Variance (ANOVA). The factors considered were age of the pavement, traffic volume and rainfall, and the results of the exploratory data analysis corroborated the results found by the analysis of variance, both in relation to the effects of factors such as of their interactions. The performance prediction models were developed for the dependent variables Pavement Condition Index (PCI) and Area of Total Cracks (ATC) for HMA pavements, and Raveling (R) and roughness (IRI BA) for ST pavements. For roughness, performance models were also developed considering, separately, two climate conditions: semiarid to arid (IRI BAa) and sub-humid to humid (IRI BAh). Residue analysis and calculation of correlation coefficient (r) and coefficient of determination (\'R POT.2\') were performed to verify the adequacy of performance prediction models. The performance models developed in this work for Area of Total Cracks (ATC) and roughness (IRI) were compared with empirical performance models used for pavement management in Brazilian and foreign highway agencies, and they presented the best results. The performance model for roughness (IRI BA) in ST pavements was also compared to a prediction model developed by DERBA using data collected by a maintenance and rehabilitation activities prioritization program and it presented the best fit to the observed data. However, to obtain even better results regarding the performance prediction of asphalt pavements in the State of Bahia, it is necessary to conduct new field surveys to feed the database and be used in further studies that include factors that could not be considered in this work, as structural capacity, for example. It is recommended that the method used in this work, based on factorial design, Exploratory Data Analysis and ANOVA, be repeated, because it proved capable of reducing the costs of data collection without compromising precision and accuracy of the obtained performance prediction models.
Assis, Rosuel Krum Mathias de. "Avaliação econômica de concessões rodoviárias no Estado de São Paulo utilizando os custos operacionais decorrentes da condição do pavimento." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18143/tde-09102017-160346/.
Повний текст джерелаThe 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.
Baltrušaitis, Andrius. "Dangos asfaltbetonio fizinių – mechaninių ir kitų rodiklių įtakos svarbiausių Lietuvos magistralinių kelių eksploatacinėms savybėms tyrimai." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2005. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2005~D_20050613_161713-99641.
Повний текст джерелаLluncor, Gallo Robert Alexander, and Barrios Richard Gerardo Salcedo. "Propuesta de gestión para mantener la rugosidad dentro de los niveles de servicio del contrato de concesión." Bachelor's thesis, Universidad Ricardo Palma, 2015. http://cybertesis.urp.edu.pe/handle/urp/1260.
Повний текст джерелаLeitão, Fernando Nahid. "Verificação à fadiga de pontes rodoviárias mistas (aço-concreto)." Universidade do Estado do Rio de Janeiro, 2009. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=3409.
Повний текст джерелаAs pontes rodoviárias mistas (aço-concreto) estão sujeitadas às ações dinâmicas variáveis, por exemplo, devido ao tráfego de veículos sobre a superfície irregular do pavimento. Estas ações dinâmicas podem gerar a nucleação de fraturas ou mesmo a sua propagação sobre a estrutura. A correta consideração desses aspectos objetivou o desenvolvimento de uma metodologia de análise, com a finalidade de avaliar os níveis dos esforços e tensões oriundos do tráfego dos veículos sobre a superfície irregular do pavimento e, bem como, proceder uma verificação à fadiga de obras de arte rodoviárias em aço e mistas (aço-concreto). Para tal, as técnicas para a contagem de ciclos de tensão e a aplicação das regras de dano acumulado foram analisadas através de curvas do tipo S-N, associadas a diversas normas de projeto. A ponte rodoviária mista (aço-concreto) investigada neste estudo é constituída por quatro vigas de aço longitudinais e por um tabuleiro de concreto armado. O modelo numérico-computacional, desenvolvido para a análise dinâmica da ponte, foi concebido com base em técnicas usuais de discretização através do método dos elementos finitos. Simulam-se as almas das vigas de aço e as lajes de concreto do tabuleiro através de elementos finitos de casca. As mesas dessas vigas, transversinas e os enrijecedores são modelados por elementos de viga tridimensionais. Os veículos são representados a partir de sistemas "massa-mola-amortecedor". O tráfego dessas viaturas é considerado mediante a simulação de comboios semi-infinitos, deslocando-se com velocidade constante sobre a ponte. As conclusões da presente investigação versam acerca da vida útil de serviço dos elementos estruturais de pontes mistas (aço-concreto).
Steel and composite highway bridges (steel-concrete) are currently subjected to dynamic actions, for example, variable magnitude due to vehicles traffic on the deck rough pavement. These dynamic actions can generate the fractures nucleation or even their propagation on the structure. The correct consideration of these aspects pointed out to an analysis methodology developed, in order to evaluate the stresses through a dynamical analysis on highway bridge decks, due to vehicles crossing on the irregular pavement surfaces and to proceed a fatigue verification from Steel and composite highway bridges (steel-concrete). The stress cycles counting techniques and the cumulative damage rules application had been analyzed through S-N curves associated with diverse projects norms. The steel and composite highway bridge (steel-concrete), investigated in this study, is constituted by four longitudinal steel beams and a composite deck. The computational model, developed for the bridge dynamic analysis , adopted the usual mesh refinement techniques present in finite element method simulations. The beam web thickness was represented by shell finite elements. The beam top and bottom flange and the longitudinal and vertical stiffeners were simulated by three-dimensional beam elements, where flexural and torsion effects were considered. The bridge concrete slab was simulated by shell finite elements. The vehicles are represented from "mass-spring-damper" systems. The traffic of these vehicles is considered as a simulation of half-infinite convoys dislocating with constant speed on the bridge. The present study conclusions concerning steel and composite highway bridges (steel-concrete) structural elements service life.
Alencar, Guilherme Santana. "Análise dinâmica e verificação à fadiga de obras de arte rodoviárias mistas (aço-concreto) submetidas ao tráfego de veículos sobre o pavimento irregular." Universidade do Estado do Rio de Janeiro, 2015. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=8772.
Повний текст джерелаAs pontes rodoviárias metálicas e mistas (aço-concreto) são submetidas a um grande número de carregamentos repetitivos de diferentes magnitudes, ao longo do tempo. Estas ações dinâmicas podem causar a nucleação de fraturas ou mesmo a propagação destas sobre o sistema estrutural. A depender da magnitude, estes efeitos podem comprometer o sistema estrutural e a sua confiabilidade, além de reduzir a vida útil das pontes. Assim sendo, neste trabalho de pesquisa foi investigada a resposta dinâmica de uma ponte mista (aço-concreto), simplesmente apoiada, com vão de 40,0 m, submetida ao tráfego de veículos sobre a superfície irregular do pavimento. Para tal um modelo numérico representativo do sistema estrutural foi desenvolvido com base no emprego do programa ANSYS, por meio do uso de técnicas usuais de discretização, via método dos elementos finitos. Um estudo paramétrico foi desenvolvido para identificar, de forma qualitativa e quantitativa, o efeito das irregularidades do pavimento sobre o comportamento dinâmico da ponte mista investigada. Em seguida, a verificação do projeto à fadiga do sistema misto foi realizada, com base no emprego do algoritmo de contagem de ciclos Rainflow e em curvas S-N associadas às principais normas de projeto sobre o tema. As conclusões deste trabalho de pesquisa alertam aos engenheiros estruturais para a possibilidade concreta acerca do aumento do dano por fadiga, relacionado às ações dinâmicas de veículos trafegando sobre o tabuleiro de pontes em aço e mistas (aço-concreto).
Steel and steel-concrete composite highway bridges are currently subjected to dynamic actions with variable magnitudes due to the action of vehicles crossing on the deck. These dynamic actions can generate the nucleation of fractures or even their propagation in the structures. Depending on the magnitude, these effects can compromise the structural system response and the reliability, which may also lead to a reduction of the expected bridge service life. This way, the dynamic response of a steel-concrete composite bridge spanning 40 m was investigated in this work. The computational model, developed for the composite bridge dynamic analysis, adopted the usual mesh refinement techniques present in finite element method simulations, and was implemented in the ANSYS program. A parametric study was performed to identify the effect of vehicle speed and roughness pavement on the investigated bridge dynamic behaviour. The proposed methodology for evaluate the bridge service life to fatigue was based on a linear cumulative damage rule, Rainflow-counting algorithm and S-N curves from main design codes. Results of a parametric analysis are presented to verify the extension of the dynamical effects on highway bridges due to vehicles crossing on the irregular pavement surface. The main conclusions of this work focuses on alerting structural engineers to the possibility of increase of fatigue damage, related to steel and composite highway bridges when subjected to vehicle dynamic actions.
Lin, Yuan-Sheng, and 林元生. "Apply Intelligent Vehicle for Pavement Roughness Survey." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/77754978439473219876.
Повний текст джерела國立中央大學
土木工程研究所
92
It’s most important to check and accept the roughness of new build or maintained pavements in pavement management system. It’s not only to concern about comfortable and safety to drive a vehicle but also decide using years of pavement. Because of the roughness of Pavement was influenced which for the most part by technique of construction and control of quality. Roughness was a key point when pavements build to finish. Although the roles which about the standard of roughness to check and accept was collected in the standard of pavement construct in our country, but the ways of survey was concluded in early periods. The apparatus to adopt most are 3m straight and Hi-Lo Detector. Mainly of index are judge by using the standard deviation of roughness. It’s difficult to describe the influence of comfortable to drive a vehicle. And it does usually survey by sampling way in present standards. So it’s hard to describe the roughness in whole line of pavement completely. In Part of apparatus to examine, the 3m straight and Hi-Lo Detector are not only waste a lot of time but also strenuous effort. It’s also can’t connect with the world current by using standard deviation of roughness. For this reason, it’s important to find the way which is efficiently to examine and good communicated index to evaluate and then to re-edit the standard to check and accept to fit in with present. So this study tries to develop the intelligent vehicle for pavement survey by oneself. It can improve the problem which existed in the apparatus of survey roughness. In addition, consult the adventures of the standard to check and accept of the pavement roughness in the world, and collect roughness data by survey apparatus to draw up the International Roughness Index (IRI) as standard of roughness by using statistics analysis ways.
Chen, Yi-Hsien, and 陳怡先. "Development of Pavement Roughness Index for Airports." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/58518893070160842524.
Повний текст джерела"Pavement Deterioration Modeling Using Historical Roughness Data." Master's thesis, 2016. http://hdl.handle.net/2286/R.I.38689.
Повний текст джерелаDissertation/Thesis
Masters Thesis Civil Engineering 2016
Wu, I.-Jui, and 吳宜叡. "Certification of Intelligent Vehicle for Pavement Roughness Survey." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/94815166248756451927.
Повний текст джерела國立中央大學
土木工程研究所
93
Roughness is a vestige lengthways the section rises and falls of fluctuation quantity of the road surface, which influence the quality of the road to drive very much. The road of the roughness faces to drive the comfort quickly can raise the road service quality. Therefore, people who use the road will not feel well if there is high and low to rise and fall the serious road to make the vehicle produced the continuous vibration. Furthermore, because of need to insure the transportation security and reduce the drive speed, it not only makes the service level and efficiency of the road reduced consumedly, but also cause the vehicle excessiveness of vibrate, the fuel consumes and reduce the vehicle service life consumedly which because the road faces not roughness. In part of apparatus to examine, the 3m straight and Hi-Lo Detector are not only waste a lot of time but also strenuous effort. It’s also not suitable in network level by using standard deviation of roughness. Although introduce an examination instrument in recent years, still belong to very few parts of units to own, and purchased the cost high in the early years. Therefore, compare to the promotion at the home advanced of the instrument examines and internationalizes the index sign the usage up is really difficult problem. So this study tries to develop the intelligent vehicle for pavement survey by oneself. It can improve the problem which existed in the apparatus of survey roughness. Even carry on a series of identification procedures to this system, among them include identifications such as identification and the international roughness index sign stability etc. of various instruments of this system. The above procedure all consults the foreign related standard to take into the identification. By the above identification procedure, in addition to canning increase the credibility of this examination system, also can improve the not easily seen problem of an examination instrument results. All intelligent vehicles for pavement survey by oneself are not passing the accredited of Chinese National Laboratory Accreditation (CNLA). Although there is keep doing the related identification procedure, it still in the research development stage. So this research hopes to first step draws up the CNLA certification procedure relevant document and operates the manual...etc. to identify the procedure by many items, matching the foreign related standard. Looking forward to make the intelligent vehicle for pavement survey which developed by oneself can pass the certification permission. This research with originally intelligent spread to face to examine the car to collect Taoyuan County inshore ll country a data, after taking in to statisticsed the analysis, and inquire into the not flat reason of causing the road.And combine the Videologging system of the Institute of Transportation development. Take into the collections in the lieutenant general all image datas with basic roads of the examination process. With continues image perhaps by the photograph, can use the stranger or two usage situation in the side landses of the related position and road of the entire content, various facilities that protect the unit to the road's segment. Didn't need to the scene, can carry on the first step the inspection the road to follow the line condition. This research collects the protect data of country way of three years in Taoyuan County. And The covariance protects the area size、Protecting the summary calculates the budget、protect the way and protect to maintain cost etc. Combining an examination data carries on the country way to protect the threshold value, The result is 6.65 m/km. Apply above all data in spread to face in the pavement management system. Expect to have to promote to inshore road quality in Taoyuan County, all use the stranger and all can have to go the car environment sooner and soon and more comfortablely.
Chien, Chien-Liang, and 簡正樑. "Framework Construction of Pay Asjusment For Pavement Roughness." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/70013605974149373323.
Повний текст джерела國立成功大學
土木工程學系專班
94
ABSTRACT Pavement roughness affects the comfort of driving on the road. A good quality for the roughness of the road could provide a better service as well as a longer PVT lift. Thus, pavement roughness can be a good judgment for the performance of the road construction. However, the major factors influeniry the roughness of the road construction are by the workmanship and the quality control of the road contractor. Therefore, to construct an adjustable payment framework system according to the degree of road pavement roughness would be a good solution for a better road. The first step is collecting the data for International Roughness Index (IRI) of the provincial roads in Taiwan. The Monte carol simulation process is used to predict the life cycle costs (Lthe CC). According to the existed models, we can compare Kaoshiung case with that of Pingtung case. In Kaoshiung case, without any special damage cause by construction or others paving can serve about 12.6 years; In Pingtung case, although it has higher rate of deteriorate, however, it also has a lower initial pavement roughness. In the end, the service period of Pingtung is three years more then that of Kaoshiung. The main concept of this paper is first, using existed ground IRI index and the Monte carol simulation process to modify an initial pavement IRI index. Second, by the concept of lift span coast to except its service life span and pay adjustment and pay factor. Finally, through the Web function to process a reliability analysis. Using such concept, this paper has successfully model a Kaoshiung road pavement construction case for its ten years lift span and has only 45.8% to accrue 47.5% different. The purpose of this paper is to summarize a reasonable method for modeling the pavement life-cycle cost. The modeling method would help to create a fair and reasonable process according to the rating of the design roughness of road pavement for both the highway agency and the contractor. Using by reasonable pay adjustment (PA) and reward for the result of construction, the agency would improve the quality of road construction.
Zhou, Yi-Hong, and 周鎰鋐. "Analysis of Vehicle-Pavement Interaction Due to Roughness." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/15425138109372064531.
Повний текст джерела國立成功大學
土木工程學系碩博士班
91
Dynamic load is the most important factor for stress prediction and life assessment of pavements. The dynamic effect cannot be resolved with either isolated pavement system or vehicle kinematic formation because vehicles and pavements are coupled as an interaction system. This article describes simulation of the coupled system and analysis of the impact force associated by moving vehicle and pavement roughness. A quarter-car model was built with a linear spring and a mass element as half of wheel axle, and a spring-dashpot system as vehicle suspension connecting the lumped car mass and the wheel axle. The concrete pavement was composed of 20-node brick elements resting on springs and dashpots. The pavement elevation was input according to sinusoidal curve to simulate surface irregularities. The model was successfully validated with theoretical solutions and was further expanded to a S122 tractor-trailer model. The dynamic effect and coupled interaction were thoughtfully discussed. Keyword: ABAQUS, vehicle-road interaction, dynamic load, rigid pavement, finite element.
Chang, Meng-Koong, and 張孟孔. "Interaction Model of Pavement Roughness and Vehicle Dynamic Load." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/60636354337792014902.
Повний текст джерела"Relative Benefit of Chip Seal Application in Different Climatic Conditions Based on Initial Pavement Roughness." Master's thesis, 2012. http://hdl.handle.net/2286/R.I.14744.
Повний текст джерелаDissertation/Thesis
M.S. Civil Engineering 2012
Chih-ShongChan and 詹智翔. "The Feasibility Study of Pavement Roughness Detecting By Mobile LiDAR." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/34668594729302618532.
Повний текст джерела國立成功大學
資源工程學系碩博士班
101
The current way of analyzing pavement roughness is manually operating the 3m-straight edge or the Hi-Lo detector. The efficiency of such measurement is only 0.8 kilometer per hour. It wastes lots of time and very laborious, does not meet the requirement of Taiwan’s situation: densely populated and intensive distribution of road. Mobile LiDAR has been introduced to Taiwan recently, comparing to traditional manual measurement, it has more advantages like accessing road information quickly, high accuracy data and without human operating error. The efficiency could reach 40 kilometers per hour that could replace traditional manual measurement completely. Based on the Optech Lynx mobile LiDAR system specifications, mobile LiDAR system has 8 mm system error. This error is unacceptable for the investigation of road roughness, need to be reduced to 6mm by data post-processing. In this study, we use two laser scanner’s point cloud data of mobile LiDAR system to process road extraction, data preprocessing and strip adjustment. Then testing the effection from different speed, turning angle and nature of pavement. The results shows when measuring vehicle’s speed is less than 60km/hr, turning angle is less than 40 degrees and driving on a generally flat road, strip adjustment will reduce systematic errors by half, could export the pavement data with enough precision for analyzing pavement roughness at Taiwan.
Chen, Kuan-yu, and 陳冠宇. "Analysis of Pavement Stresses due to Roughness with Dynamic Response Functions." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/03711772231683727015.
Повний текст джерела國立成功大學
土木工程學系碩博士班
97
Roughness of roads causes pavement stress fluctuation along the road. However, the dynamic effects were not taken into account in most pavement design and researches. To investigate the influences of roadway roughness on pavement stresses, this study developed a coupled system consisting of a quarter-car model and an equivalent one-degree mass-spring pavement model. The coupled system also incorporated measured road profiles. By means of transfer function in frequency domain, the deflections and stresses of pavements were computed in seconds. The results were validated by comparing with Westergaard solutions satisfactorily. It was found that the critical roughness, which might cause extreme responses, is related to the vehicle speed, suspension design of vehicles. The maximum tension at the bottom of pavements also depends on the slope of road profiles. In addition, the study demonstrates the correlation between two road roughness classification indices, IRI and ISO. It was also found that disturbance due to model boundary affects simulation results significantly.
Yi-HsienLiu and 劉奕賢. "Evaluation the Reliability of Pavement Service Life Using Roughness Degradation Data." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/52806610924068692142.
Повний текст джерела國立成功大學
土木工程學系
102
In Taiwan, due to the rapid increased highway network in the past ten years as well as aging of the highway infrastructure, Taiwan Area National Freeway Bureau (TANFB) has encountered great challenge to maintain their highway network in good condition. The major challenge for pavement engineers is to maintain good condition of roadway with least costs. In order to estimate maintenance cost for whole highway network, it is important to know when and how much percent of pavement network fails in the future. In this study, two reliability analysis approaches (failure-time analysis as well as degradation analysis) were performed to estimate the network level pavement service life based on international roughness index (IRI) data collected from the outer lane of Taiwan’s national freeway network during 2006 to 2010. The pavement maintenance threshold of 3, 3.5, and 4 m/km and failure probability 25 percent were used to estimate the pavement service life for pavements in the north, central and south district of national freeway system. The results of failure-time analysis shown that the predicted pavement service life for the north, central and south district of southbound freeway one are 4.9, 4.6 and 1.6 years; of the northbound freeway one are 2.5, 4.8 and 0.8 years; of the southbound freeway three are 2.6, 2.4 and 1.6 years, and of the northbound freeway three are 2.4, 2.6 and 2.9 years. For the degradation analysis, the estimated pavement service life of north, central and south district of freeway one southbound are 2.6, 3.4 and 1.6 years; of freeway one northbound are 2.5, 3.8 and 1.2 years; of freeway three southbound are 3.4, 4.3 and 1.3 years; and of freeway three northbound are 3.2, 3.4 and 2.4 years. In general, both approaches estimate pavement service life of 2 to 5 years that is similar to the maintenance frequency currently adopted by the expert engineers in the TANFB.
Chen, Chine-Ta, and 陳建達. "Study of Automatic Pavement Roughness Measurement and Distress Image Detection System." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/42266174202630608365.
Повний текст джерела國立中央大學
土木工程研究所
98
Since 1999, there were a lot of studies about pavement management system, but unfortunately we did not use it in real maintainance works. The purpose of this study is that we want to integrate three kinds of important technique into intelligent survey vechiel, and try to think a standard operation for pavement survey. We did a lot of tests and verified about the pavement roughness measurement system in accordance with ASTM E950 and AASHTO PP49. We find that all results of test is conforming the standard of ASTM and AASHTO. Roughness is a very important performance indicator in pavement maintenance management systems. The international rough index of indicators was used as the core of roughness measuring of degree gradually in recent years domestically, but to predict a smooth degree of indicators the method is set up differently as there is a different prediction indicator because the theoretical foundation is different.We predicts the deteriorationof IRI by different ways, including grey forecast, multiple regression. We also try to use data minning technique to find a rule between unified condition index and pavement condition index, and the accuracy of the J48 classification tree is 80%. This study uses the pavement data of country road in Taoyuan County to build “Country Pavement Performance Index” by entropy. Now, it is a simple way to know the profiler of pavement and detect pavement distress at the same time. This intellegent system can use vediologging module to locate the road image and build a function to let road image import into pavement management system automatically. We can supply the latest information of road to pavement management system.