An existing analytical model, in use by Spoornet for the past two decades for calculating rail stresses on railway track, was revisited and improved. The model provided engineers with an easy-to-use program for evaluating track capacity and authorizing heavier loads on track. The model was modified to calculate rail and track component stresses more accurately. These modifications include the incorporation of current best practices and presentation of guidelines for the engineer on how to determine some input parameters which are normally difficult to obtain. Firstly it was determined which input parameters the model was the most sensitive to. Thereafter it was determined whether or not the correct information would generally be readily available for those sensitive parameters. The most sensitive parameters were further investigated and test results, as well as best practice analytical methods, were used to establish nominal input values and guidelines for determining such values. This research was necessary to establish whether or not the currently used analytical model still provided railway engineers with a useful tool and whether or not more modern and popular tools could validate or replace it. After some modifications to the analytical model, it was proved that it provides engineers with a suitably accurate tool for calculating rail and track component stresses, without the need to build time-consuming models of the track under investigation. It showed that the model, after some modifications, is current with calculational methods in recent publications and provides an immediate answer to "what-if" questions without the need to run lengthy analyses. / Dissertation (MEng (Mechanical Engineering))--University of Pretoria, 2006. / Mechanical and Aeronautical Engineering / unrestricted

Structural Health Monitoring (SHM) is a promising tool for condition assessment of bridge structures. SHM of bridges can be performed for different purposes in long or short-term. A few aspects of short- and long-term monitoring of highway bridges are addressed in this research. Without quantifying environmental effects, applying vibration-based damage detection techniques may result in false damage identification. As part of a long-term monitoring project, the effect of temperature on vibrational characteristics of two continuously monitored bridges are studied. Natural frequencies of the structures are identified from ambient vibration data using the Natural Excitation Technique (NExT) along with the Eigen System Realization (ERA) algorithm. Variability of identified natural frequencies is investigated based on statistical properties of identified frequencies. Different statistical models are tested and the most accurate model is selected to remove the effect of temperature from the identified frequencies. After removing temperature effects, different damage cases are simulated on calibrated finite-element models. Comparing the effect of simulated damages on natural frequencies showed what levels of damage could be detected with this method. Evaluating traffic loads can be helpful to different areas including bridge design and assessment, pavement design and maintenance, fatigue analysis, economic studies and enforcement of legal weight limits. In this study, feasibility of using a single-span bridge as a weigh-in-motion tool to quantify the gross vehicle weights (GVW) of trucks is studied. As part of a short-term monitoring project, this bridge was subjected to four sets of high speed, live-load tests. Measured strain data are used to implement bridge weigh-in-motion (B-WIM) algorithms and calculate the corresponding velocities and GVWs. A comparison is made between calculated and static weights, and furthermore, between supposed speeds and estimated speeds of the trucks. Vibration-based techniques that use finite-element (FE) model updating for SHM of bridges are common for infrastructure applications. This study presents the application of both static and dynamic-based FE model updating of a full scale bridge. Both dynamic and live-load testing were conducted on this bridge and vibration, strain, and deflections were measured at different locations. A FE model is calibrated using different error functions. This model could capture both global and local response of the structure and the performance of the updated model is validated with part of the collected measurements that were not included in the calibration process.

No description available.

Pour les ouvrages neufs, les modèles de trafic dans les normes ou les législations pour la conception des ponts incluent une marge de sécurité suffisante pour que la croissance du trafic soit prise en compte sans dommage par ces ouvrages. Les fondements et les utilisations faites de ces méthodes pour modéliser les effets extrêmes du trafic sur les ouvrages sont donnés dans un premier chapitre. Différentes méthodes sont ainsi étudiées, telles la méthode des moments (MM), la méthode des moments à poids (PWM), le maximum de vraisemblance (ML), le maximum de vraisemblance pénalisé (PML), le minimum de la densité de la divergence (MDPD), la méthode des fractiles empiriques (EPM), la statistique du maximum d'adaptation et la vraisemblance des moments (LM). Pour comparer ces méthodes, des échantillons numériques, des effets de trafic simulés par Monte Carlo et des effets mesurés sur un ouvrage réel sont utilisés. Pour des effets du trafic simulés, ML et PML donne des valeurs de retour plus correctes lorsque le nombre de valeurs au-dessus du seuil est supérieur à 100 ; Des méthodes permettant de prendre en compte ce point et utilisant des distributions mélangées (exponentielles ou valeurs extrêmes généralisées) ont été proposées dans la littérature pour modéliser les effets du trafic. Pour des ponts ayant des portées supérieures à 50m, le scénario déterminant est celui de la congestion, qui n'est pas ce qui est étudié ici. De plus, le trafic n'est pas la composante déterminante pour la conception des ponts de longue portée. Mais des problèmes de fatigue peuvent apparaître dans certains ponts, tels les ponts métalliques à dalle orthotrope, où l'étude du trafic peut devenir nécessaire. Ainsi nous avons fait une étude de l'influence de la position des véhicules sur le phénomène de fatigue. Pour cela, quatre fichiers de trafic réels, mesurés en 2010 et 2011 par quatre stations de pesage différentes, ont été utilisés. Ils ont mis à jour des comportements latéraux différents d'une station à l'autre. Si nous les appliquons au viaduc de Millau, qui est un pont métallique à haubans et à dalle orthotrope, nous voyons que l'histogramme des effets et l'effet de fatigue cumulé est beaucoup affecté par le comportement latéral des véhicules. Ainsi, des études approfondies utilisant les éléments finis pour modéliser les ouvrages et des enregistrements de trafic réel, peuvent être utilisées pour pré-déterminer quels éléments, donc quelles soudures, doivent être examinés dans les ponts afin d'estimer leur santé structurelle / Traffic load model in standard or specification for bridge design should guarantee all newly designed bridges to have sufficient security margin for future traffic. Many different methods have been used to model extreme traffic load effects on bridges for predicting characteristic value for short or long return period. In order to provide some guidance on selecting parameter estimation when applying POT to bridge traffic loading, we focus on the effect that method used to estimate the parameters of the GPD has on the accuracy of the estimated characteristic values. Through this qualitative discussion on the methods, several available methods for traffic loading are selected. Numerical simulation data, Monte Carlo simulation traffic load effects and in-field traffic load effect measurements are analyzed and presented. Literature points out that the traffic load effect is induced by loading event that involves different number of vehicles, and the distribution of the load effects from different loading events are not identically distributed, which violates the assumption of classic extreme value theory that the underlying distribution should be identically independent distributed. Methods using mixture distribution (exponential or generalized extreme value) has been proposed in the literature to model the extreme traffic load effect by loading event. However, the traffic loading may be also importance if the bridge encounter traffic induced fatigue problem, components like orthotropic steel deck is governed by traffic induced fatigue load effects. We intend to explore the influence of traffic load on the fatigue behaviour of orthotropic steel deck, especially the influence of the loading position in terms of transverse location of vehicle. Measurements of transverse location of vehicle collected from by weigh-in-motion (WIM) systems in 2010 and 2011 four French highways showed a completely different distribution model of transverse location of vehicle to that recommended in EC1. Stress spectrum analysis and fatigue damage calculation was performed on the stresses induced traffic on orthotropic steel deck of Millau cable-stayed bridge. By comparing the stresses and damages induced by different traffic patterns (through distributions of transverse location of vehicle), it was found that the histogram of stress spectrum and cumulative fatigue damage were significantly affected by the distribution of transverse location of vehicle. Therefore, numerical analysis that integrates finite element modelling and traffic data with distributions of transverse location of vehicles can help to make an accurate predetermination of which welded connections should be sampled to represent the health of the deck

Introdução: O Estuário de Santos e São Vicente está contaminado com metais pesados, compostos organoclorados, dioxinas e furanos. Estudos epidemiológicos evidenciam que fetos são mais susceptíveis às substâncias tóxicas que adultos. Este trabalho avaliou a ocorrência de eventos relacionados à gestação em áreas contaminadas e não contaminada na região estuarina. Métodos: Estudo transversal onde foram analisados dados do SINASC entre 2003 e 2007 nos municípios de São Vicente, Guarujá, Cubatão e Bertioga. Foram calculadas as taxas bruta de natalidade e de fecundidade total por ano e os riscos de nascimento prematuro, baixo peso de nascimento, nascimento múltiplo e presença de anormalidade congênita no período, por município. Um questionário estruturado e pré-testado foi aplicado em uma amostra de base populacional (820 famílias) em cinco áreas da região, quatro dessas em áreas contaminadas e uma (controle) sem contaminação conhecida. Foram calculados os riscos de ocorrência de mulheres em idade fértil que engravidaram, aborto, parto prematuro, baixo peso ao nascer, natimorto, malformação congênita e nascimento múltiplo. Os dados de aborto e ocorrência de gestação foram georreferenciados na área 3, São Vicente continental. Utilizou-se o teste do qui-quadrado de Pearson ou teste exato de Fisher investigando associações entre as áreas e as variáveis qualitativas. O odds ratio (OR) e os intervalos de confiança de 95% foram calculados por regressão logística de acordo com as áreas, ajustados para fatores de confusão (socioeconômicos, demográficos e de hábitos das mulheres). Nível de significância foi de 5%. Resultados: As taxas de natalidade e fecundidade diminuíram no período em todos os municípios, predominantemente em Bertioga. Existe risco significativamente maior (p=0,00) de ocorrência de baixo peso de nascimento em São Vicente (OR=2,25; 1,93 2,62), no Guarujá (OR=2,14; 1,80 2,56) e em Cubatão (OR=2,06; 1,75 2,43), que em Bertioga, controlado pela idade, estado civil e escolaridade da mãe, consulta pré-natal, e malformações congênitas. O risco de parto prematuro também foi significativamente maior (p=0,00) em São Vicente (OR= 2,24; 1,89 2,65), no Guarujá (OR=2,31; 1,91 2,80) e em Cubatão (OR = 2,51; 2,09 3,00) que em Bertioga, controlado por idade, estado civil e escolaridade da mãe, consulta pré-natal, e malformações congênitas. O risco de malformações congênitas também significativamente maior no Guarujá (OR=2,24; 1,43 3,50; p=0,00) e em Cubatão (OR=1,62; 1,04 2,52; p=0,03) que em Bertioga, controlado por idade e estado civil da mãe, consulta pré-natal, e nascimento múltiplo. A prevalência dos desfechos gestacionais foi maior nas quatro áreas contaminadas que na área controle. Comparado com a área 5 (controle), um risco significativamente maior de não ocorrência de gestantes, controlando para idade materna, escolaridade materna e renda familiar, foi encontrado na área 2 (OR=1,47; 1,16 1,85), na área 3 (OR=1,31; 1,03 1,66) e na área 4 (OR=1,40; 1,10 1,77). Também houve um risco significativamente maior de abortos na área 3 (OR=1,83; 1,07 3,12) controlando para anos morando na região, idade e escolaridade materna, renda familiar e uso de tabaco materno passado. Conclusões: O estudo evidencia um aumento de risco de desfechos gestacionais em áreas contaminadas na região dos Estuários de Santos e São Vicente / Background: Santos and São Vicente Estuary is contaminated with heavy metals, organochlorines compounds, dioxins and furans. Epidemiological studies show that fetuses are more susceptible to toxic chemicals than adults. This study evaluated occurrence of pregnancy events in contaminated and non-contaminated areas in estuarine region. Methods: This cross-sectional study analyzed SINASC data from 2003 to 2007 in São Vicente, Guarujá, Cubatão and Bertioga cities. Crude birth and total fertility rates per year, and risks of preterm birth, low birth weight, multiple birth and congenital abnormality in the period were calculated by city. A pre-tested and structured questionnaire was applied in a population-based sample (820 families each) in five areas. Four of these areas are in contaminated regions and one (control) has no known environmental contamination. Risks of childbearing age women who became pregnant, abortion, premature birth, low birth weight, stillbirth, congenital malformation and multiple birth were calculated. Data of abortion and pregnancy occurrence were georeferenced in area 3, continental part of São Vicente city. Pearsons chi-square test or Fishers exact test were used to investigate associations between areas and qualitative variables. Odds ratio and 95% confidence intervals were calculated by logistic regression according to the area, adjusted for confounding factors (socioeconomic, demographic and women habits). The statistical significance level was set at 5%. Results: Birth and fertility rates declined over the years in all cities, predominantly in Bertioga. There were significant higher risks (p<0.01) of low birth weight in São Vicente (OR=2.25, 1.93 2.62), Guarujá (OR=2,14, 1.80 2.56) and Cubatão (OR=2.06, 1.75 2.43), compared to Bertioga, controlling for maternal age, marital status, maternal education, prenatal, and congenital abnormalities. Risk of preterm birth was also significantly higher (p<0.01) in São Vicente (OR=2.24, 1.89 2.65), Guarujá (OR=2.31, 1.91 2.80), and Cubatão (OR=2.51, 2.09 3.00) than Bertioga, controlling for maternal age, marital status, maternal education, prenatal, and congenital abnormalities. Risk of congenital abnormalities was significantly higher in Guarujá (OR=2.24, 1.43 3.50, p=0.00) and Cubatão (OR=1.62, 1.04 2.52, p=0.03) than Bertioga, controlling for maternal age, marital status, prenatal and multiple birth. Prevalences of pregnancy outcomes were higher in the four contaminated areas than in control area. Compared to area 5 (control), significantly higher risks (p<0.05) of non-pregnant women was found in areas 2 (OR=1.47, 1.16 1.85), 3 (OR=1.31, 1.03 1.66), and 4 (OR=1.40, 1.10 1.77) controlling for maternal age, maternal education, and family income. There was also a significantly higher risk of abortion in area 3 (OR=1.83, 1.07 3.12) controlling for years living in the region, maternal age and education, family income and maternal past smoking. Conclusions: The study shows an increased risk of pregnancy outcomes in contaminated areas of Santos and São Vicente Estuary region

Die Beziehungen zwischen der Reproduktionsleistung und der Körperkondition wurde in zwei Experimenten mit Awassi Schafen im Libanon untersucht. Im ersten Experiment wurden 72 Schafe in drei Altersklassen (Zutreter, primipare und multipare Mutterschafe), in zwei Körpergewichtsklassen (leichte, schwere) eingeteilt und jeweils zwei Fütterungsgruppen (ohne und mit Zufüterung) zugeordnet. Primipare und multipare Mutterschafe der Zufütterungsgruppe wiesen höhere Körperkondition, gemessen als BCS (p / The relationship between reproductive performances and body condition has been studied in 2 experiments using Awassi sheep in Lebanon. In the first exp., 72 experimental animals were grouped according to age (ewe lamb A, primiparous P, multiparous M), to body weight into small weight (SW) and large weight (LW), and kept under two management systems: traditional and improved (barley supplement). Primiparous and multiparous ewes showed a higher BCS (p

[pt] Esta dissertação examina com enfoques estruturais e funcionais, com base na gramática de valências, as realizações dos verbos medir, pesar, custar e durar com o objetivo específico de abordar o relacionamento dos elementos frásicos desses verbos. Na concepção tradicional, os verbos aqui estudados são classificados ora como transitivos, ora como intransitivos e os elementos à direita como objeto direto e adjunto adverbial. Esse conceito de transitividade é insuficiente para a análise das realizações desses verbos. A partir das questões levantadas, é feita uma análise sintático-semântica das realizações desses verbos. O resultado da análise revela que rotular os elementos frásicos é restritivo pois não contempla a diversidade de traços semânticos imbricados nessas realizações, o que resulta em uma necessidade de avaliação do paradigma do ensino de análise sintática que vigora, tradicionalmente, em muitas instituições de ensino. / [en] This dissertation examines, within a structural and functional perspective and based on the valency grammar, the linguistic structures of the verbs of measurement (measure, weigh, cost and last) with the specific aim of discussing the grammatical relations of their phrasal elements. From a traditional standpoint, the verbs herein studied are classified either as transitive or as intransitive and the elements to their right denominated direct objects or adverbials. This concept of transitivity, however, is insufficient in analyzing the myriad uses of these verbs. From the issues raised in this paper, a syntactic-semantic analysis is provided. The conclusion illustrates that classifying the clause elements is restrictive since it does not take into account the diversity of semantic features expressed in these clauses, culminating in a need for rethinking the traditional teaching paradigm of syntactic analysis used by many schools.

Introdução: O Estuário de Santos e São Vicente está contaminado com metais pesados, compostos organoclorados, dioxinas e furanos. Estudos epidemiológicos evidenciam que fetos são mais susceptíveis às substâncias tóxicas que adultos. Este trabalho avaliou a ocorrência de eventos relacionados à gestação em áreas contaminadas e não contaminada na região estuarina. Métodos: Estudo transversal onde foram analisados dados do SINASC entre 2003 e 2007 nos municípios de São Vicente, Guarujá, Cubatão e Bertioga. Foram calculadas as taxas bruta de natalidade e de fecundidade total por ano e os riscos de nascimento prematuro, baixo peso de nascimento, nascimento múltiplo e presença de anormalidade congênita no período, por município. Um questionário estruturado e pré-testado foi aplicado em uma amostra de base populacional (820 famílias) em cinco áreas da região, quatro dessas em áreas contaminadas e uma (controle) sem contaminação conhecida. Foram calculados os riscos de ocorrência de mulheres em idade fértil que engravidaram, aborto, parto prematuro, baixo peso ao nascer, natimorto, malformação congênita e nascimento múltiplo. Os dados de aborto e ocorrência de gestação foram georreferenciados na área 3, São Vicente continental. Utilizou-se o teste do qui-quadrado de Pearson ou teste exato de Fisher investigando associações entre as áreas e as variáveis qualitativas. O odds ratio (OR) e os intervalos de confiança de 95% foram calculados por regressão logística de acordo com as áreas, ajustados para fatores de confusão (socioeconômicos, demográficos e de hábitos das mulheres). Nível de significância foi de 5%. Resultados: As taxas de natalidade e fecundidade diminuíram no período em todos os municípios, predominantemente em Bertioga. Existe risco significativamente maior (p=0,00) de ocorrência de baixo peso de nascimento em São Vicente (OR=2,25; 1,93 2,62), no Guarujá (OR=2,14; 1,80 2,56) e em Cubatão (OR=2,06; 1,75 2,43), que em Bertioga, controlado pela idade, estado civil e escolaridade da mãe, consulta pré-natal, e malformações congênitas. O risco de parto prematuro também foi significativamente maior (p=0,00) em São Vicente (OR= 2,24; 1,89 2,65), no Guarujá (OR=2,31; 1,91 2,80) e em Cubatão (OR = 2,51; 2,09 3,00) que em Bertioga, controlado por idade, estado civil e escolaridade da mãe, consulta pré-natal, e malformações congênitas. O risco de malformações congênitas também significativamente maior no Guarujá (OR=2,24; 1,43 3,50; p=0,00) e em Cubatão (OR=1,62; 1,04 2,52; p=0,03) que em Bertioga, controlado por idade e estado civil da mãe, consulta pré-natal, e nascimento múltiplo. A prevalência dos desfechos gestacionais foi maior nas quatro áreas contaminadas que na área controle. Comparado com a área 5 (controle), um risco significativamente maior de não ocorrência de gestantes, controlando para idade materna, escolaridade materna e renda familiar, foi encontrado na área 2 (OR=1,47; 1,16 1,85), na área 3 (OR=1,31; 1,03 1,66) e na área 4 (OR=1,40; 1,10 1,77). Também houve um risco significativamente maior de abortos na área 3 (OR=1,83; 1,07 3,12) controlando para anos morando na região, idade e escolaridade materna, renda familiar e uso de tabaco materno passado. Conclusões: O estudo evidencia um aumento de risco de desfechos gestacionais em áreas contaminadas na região dos Estuários de Santos e São Vicente / Background: Santos and São Vicente Estuary is contaminated with heavy metals, organochlorines compounds, dioxins and furans. Epidemiological studies show that fetuses are more susceptible to toxic chemicals than adults. This study evaluated occurrence of pregnancy events in contaminated and non-contaminated areas in estuarine region. Methods: This cross-sectional study analyzed SINASC data from 2003 to 2007 in São Vicente, Guarujá, Cubatão and Bertioga cities. Crude birth and total fertility rates per year, and risks of preterm birth, low birth weight, multiple birth and congenital abnormality in the period were calculated by city. A pre-tested and structured questionnaire was applied in a population-based sample (820 families each) in five areas. Four of these areas are in contaminated regions and one (control) has no known environmental contamination. Risks of childbearing age women who became pregnant, abortion, premature birth, low birth weight, stillbirth, congenital malformation and multiple birth were calculated. Data of abortion and pregnancy occurrence were georeferenced in area 3, continental part of São Vicente city. Pearsons chi-square test or Fishers exact test were used to investigate associations between areas and qualitative variables. Odds ratio and 95% confidence intervals were calculated by logistic regression according to the area, adjusted for confounding factors (socioeconomic, demographic and women habits). The statistical significance level was set at 5%. Results: Birth and fertility rates declined over the years in all cities, predominantly in Bertioga. There were significant higher risks (p<0.01) of low birth weight in São Vicente (OR=2.25, 1.93 2.62), Guarujá (OR=2,14, 1.80 2.56) and Cubatão (OR=2.06, 1.75 2.43), compared to Bertioga, controlling for maternal age, marital status, maternal education, prenatal, and congenital abnormalities. Risk of preterm birth was also significantly higher (p<0.01) in São Vicente (OR=2.24, 1.89 2.65), Guarujá (OR=2.31, 1.91 2.80), and Cubatão (OR=2.51, 2.09 3.00) than Bertioga, controlling for maternal age, marital status, maternal education, prenatal, and congenital abnormalities. Risk of congenital abnormalities was significantly higher in Guarujá (OR=2.24, 1.43 3.50, p=0.00) and Cubatão (OR=1.62, 1.04 2.52, p=0.03) than Bertioga, controlling for maternal age, marital status, prenatal and multiple birth. Prevalences of pregnancy outcomes were higher in the four contaminated areas than in control area. Compared to area 5 (control), significantly higher risks (p<0.05) of non-pregnant women was found in areas 2 (OR=1.47, 1.16 1.85), 3 (OR=1.31, 1.03 1.66), and 4 (OR=1.40, 1.10 1.77) controlling for maternal age, maternal education, and family income. There was also a significantly higher risk of abortion in area 3 (OR=1.83, 1.07 3.12) controlling for years living in the region, maternal age and education, family income and maternal past smoking. Conclusions: The study shows an increased risk of pregnancy outcomes in contaminated areas of Santos and São Vicente Estuary region

The field of bridge monitoring is one of rapid development. Advances in sensor technologies, in data communication and processing algorithms all affect the possibilities of Structural Monitoring in Bridges. Bridges are a very critical part of a country’s infrastructure, they are expensive to build and maintain, and many uncertainties surround important factors determining their serviceability and deterioration state. As such, bridges are good candidates for monitoring. Monitoring can extend the service life and avoid or postpone replacement, repair or strengthening works. The amount of resources saved, both to the owner and the users, by reducing the amount of non-operational time can easily justify the extra investment in monitoring. This thesis consists of an extended summary and five appended papers. The thesis presents advances in sensor technology, damage identification algorithms, Bridge Weigh-In-Motion systems, and other techniques used in bridge monitoring. Four case studies are presented. In the first paper, a fully operational Bridge Weigh-In-Motion system is developed and deployed in a steel railway bridge. The gathered data was studied to obtain a characterization of the site specific traffic. In the second paper, the seasonal variability of a ballasted railway bridge is studied and characterized in its natural variability. In the third, the non-linear characteristic of a ballasted railway bridge is studied and described stochastically. In the fourth, a novel damage detection algorithm based in Bridge Weigh-In-Motion data and machine learning algorithms is presented and tested on a numerical experiment. In the fifth, a bridge and traffic monitoring system is implemented in a suspension bridge to study the cause of unexpected wear in the bridge bearings. Some of the major scientific contributions of this work are: 1) the development of a B-WIM for railway traffic capable of estimating the load on individual axles; 2) the characterization of in-situ measured railway traffic in Stockholm, with axle weights and train configuration; 3) the quantification of a hitherto unreported environmental behaviour in ballasted bridges and possible mechanisms for its explanation (this behaviour was shown to be of great importance for monitoring of bridges located in colder climate) 4) the statistical quantification of the nonlinearities of a railway bridge and its yearly variations and 5) the integration of B-WIM data into damage detection techniques. / <p>QC 20140910</p>

Cette thèse de doctorat porte sur l'étude et la réalisation d'une plateforme de pesage dynamique pour véhicule roulant basée sur un concept d'intégration de la charge. Ce concept est mis en œuvre en vue de pouvoir minimiser la taille et l'encombrement de ce type de dispositif tout en effectuant des pesées présentant des caractéristiques métrologiques acceptables. Nous démontrons tout d'abord au travers de la réalisation d'un prototype et de plusieurs campagnes d'essais, la faisabilité de la méthode utilisée. Nous évaluons dans un deuxième temps les performances présentées par le prototype lors du pesage de véhicules légers roulant jusqu'à des vitesses de 35km/h. Une étude est ensuite menée sur les jauges de déformation piézorésistives et les jauges piézoélectriques réalisées en couches épaisses grâce à des techniques de sérigraphie. Nous caractérisons ces transducteurs avec pour objectif leur utilisation dans des dispositifs de pesage en remplacement des jauges de déformation classiques à filaments métalliques. / This PhD thesis is devoted to the study and implementation of a weigh-in-motion platform for vehicle based on a concept of integration of load. This concept is used to minimize the size of this kind of device while performing weighings with acceptable results. First, we show thanks to a protoype and several test campagns, the feasability of the method used. In a second time, we evaluate the performances of the prototype in terms of precision and repeatability with the dynamic weighing of vehicles at speeds up to 35km/h. A study is finally conducted on thick-film piezoresitive strain gauges and piezoelectric gauges manufacturing by a screen-printing process with cermet and polymer pastes. We characterize these tranducers with the goal of used them as an alternative of conventional foil strain gauges.