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11th International congress on cleft lip and palate and related craniofacial anomalies

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Parametric Analysis of the Stability of Degraded Railroad Platforms

2009年

作者： amaral cassio eduardo raposo do

Includes bibliographical references and index.

ISBN: (纸本)9788875875176

Includes bibliographical references and index.

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Journal of Civil Engineering and Architecture 2014年第1期8卷 11-18页

作者： Paulo Roberto Aguiar cassio eduardo Lima de Paiva Geotechnical and Transportation Department Civil Engineering School Campinas University (UN1CAMP) Campinas 13000-000Brazil

The current study is developed based on one of the types of subgrade rupture risk suggested by Selig and Waters （1994）. It aims to evaluate subgrade stability railroad, which consists of the slope stability analysis of a railway yard embankment subjected to a wagon load type gondola parked on this track. This proposed analysis was taken into consideration because there are Brazilian railroads in high deterioration level. In some of these lines the tracks are submitted to increasing amount of load every year. The adopted model slope stability to the studied railroad embankments considers the rupture on circular line. It was applied the Geoslope-Slope/W software, version 6, to the evaluation of the platform-slope system. Several situations are adopted to reach the minimum safety slope, permitting to analyze the platform stability to keep railroad traffic under adequate safety level.

关键词： Rupture circle railway yard track tensions at subgrade degraded railway track.

Sensitivity Study of Design Parameters of a Railway Route under Vertical Deformations

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Journal of Civil Engineering and Architecture 2014年第5期8卷 663-672页

作者： Luiz Fernando de Melo Correia cassio eduardo Lima de Paiva Department of Civil Engneering Universidade Estadual de Campinas (UNICAMP) Campinas 13083-970 Brazil

Studying the interaction of components is basic for a railroad project, which is also very important for creating maintenance procedures based on predictions from a model that assumes adequate performance. To determine these interactions, which can have a great number of combinations, the use of a computational model is of vital importance, in this case, the program FERROVIA 1.0 （RAILROAD 1.0） was used. A critical study developed the program FERROVIA 1.0, and its variables were characterized based on values observed in the literature. After initial characterization was carried out, a comparative study was performed on the sensitivity between these variables and the indications of significant behavior for a railway deformed by the known load of a wheel. A statistical program was used to correlate the elements. The intention was to launch the program FERROVIA 1.0 and later use it for 2,187 combinations. The data used in these correlations corresponded to the normal values for the elements used in railroad engineering practice. Our main goal is to understand the behavior of the track vertical deflection according to the variation of the scaling of the various elements of the railway,

关键词： Railway computational model RAILROAD 1.0.

Vertical Loads Effects Applied on the Pavement Considering the Variation on Tire Pressure

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Journal of Traffic and Transportation Engineering 2014年第2期2卷 107-115页

作者： Pablo Yugo Yoshiura Kubo cassio eduardo Lima de Paiva Adelino Jorge Lopes Ferreira Arthur eduardo de Freitas Larocca Glaucio Rogerio Cararo Department of Civil Engineering University of Campinas Campinas 13083-852 Brazil Department of Civil Engineering University of Coimbra Coimbra 3030-788 Portugal Department of Mechanical Engineering Alpha Technical Services Curitiba 80520-590 Brazil Chassis and Vehicle Dynamic Engineering Volvo Group Latin America Curitiba 81290-000 Brazil

The main objective of this paper is to analyse the vertical loads effects applied on the pavement, considering the variation of tire pressure, from a truck＇s front suspension. For the measurements, a durability test track located in Brazil has been used. The tire pressure was increased by l0 psi from 90 psi to 130 psi with a constant load of 6 t on the front suspension, the maximum allowed load for front axle according to Brazilian legislation. By applying relative damage concept, it is possible to conclude that the variation on the tire pressure will not affect significantly the load applied on the pavement. However, it is recommended to repeat the same methodology in order to analyse the influence on the variation of the other quarter car model variants.

关键词： Vertical load pavement relative damage.

Evaluation between Two Brazilian Railway Tracks

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Journal of Civil Engineering and Architecture 2011年第9期5卷 772-778页

作者： cassio eduardo Lima de Paiva Creso de Franco Peixoto Luiz Femando de Melo Correia Paulo RobertoAguiar Geotechnical and Transportation Department UNICAMP State University of Campinas Brazil Erelys Consulting and Assessment Ltd. Brazil

Most of Brazilian railways were built more than 100 years ago. Some of them were submitted to rebuilding processes while others were just overloaded by additional layers of ballast. Nowadays, Brazil is going through a new railway transport impulse in relation to the increase of load, despite of the necessary supply capacity. For this reason, there were developed evaluations from some Brazilian railways in order to determine their operational conditions. This work shows a comparative analysis of results from two parts of studied old railway, aiming to determine minimum features to enable them to accept higher load axis. One of these studied old railway parts did not have a sub-ballast layer in contrast to the other one. The strains and stresses of these old railway track parts were generated by the same locomotive.

关键词： Railway track field strain survey track deflection basin.

Stresses Analysis on a Rail Part

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Journal of Civil Engineering and Architecture 2013年第8期7卷 964-972页

作者： cassio eduardo Lima de Paiva Jose Lulz Antunes de Oliveira e Sousa Luiz Carlos de Almeida Paulo RobertoAguiar Luiz Femando de Melo Correia Juliana Silva Watanabe Rodrigo Moreira de Carvalho Creso deFranco Peixoto Denis Palomo Paschoalin Geotecnical and Ttransportation Department & Department of Structure School of Civil Engineering University of CampinasCampinas 13083-852 Brazil Ignatian Educational Foundation S6o Bernardo do Campo 09850-901 Brazil VALE S A. Belo Horizonte 30140-001 Brazil

The EFVM （Vitoria Minas Railroad） is one of the main railways in Brazil. It transports freight trains of ore, 220 wagons each. These wagons have 2 boogies of 2 axles each and 32 metric tons on metre gauge. Elastic strains were measured on a special part of this railway due to these trains. The main load to evaluate stresses and strains was a G 16 Locomotive, a C-C kind from Vale, a Brazilian Company. The measurements were obtained by dynamic deflectometer installed on a main line of this railway, near Ipatinga, a city from Minas Gerais, one of Brazil states. This track was equipped to obtain stresses under an equal repeated static load A simulation of the stresses was made under critical strain by Ferrovia 1.0 software. It was also made an evaluation of unequal results from neighbor sleepers taking in comparison two equipped parts of this railway, one with compacted ballast and no compaction to the other. The results were strain limited, avoiding breakage or damage to the studied rails. This work analyses these measurements focusing on the improvement of track quality.

关键词： Railway track field strain survey rail stresses.