Cete de lOuest

Nantes, France

Cete de lOuest

Nantes, France
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Le Bastard C.,CETE de lOuest | Guilbert D.,CETE de lOuest | Delepoulle A.,Grenoble Institute of Technology | Boubezoul A.,IFSTTAR | And 2 more authors.
IEEE Conference on Intelligent Transportation Systems, Proceedings, ITSC | Year: 2011

This paper addresses the use of existing widespread Inductive Loops Detector (ILD) Network for realizing an estimation of individual travel time for a mixed population of cars and trucks. The aim is to provide traffic information to both users and traffic managers. The identification of vehicles is realized by comparing the destination inductive signature features with the origin inductive signature features using an identification method. In this paper, we propose to use three identification methods: a Bayesian based learning approach, a fuzzy logic method and the SVM method. These methods are evaluated on a real site. In order to increase the level of identification, several propositions are carried out and discussed. © 2011 IEEE.

Reiffsteck P.,University Paris Est Creteil | Puech A.,Fugro | Po S.,Fugro | Pilniere F.,CETE de lOuest | Gaschet J.,CETE de lOuest
Geotechnical and Geophysical Site Characterization 4 - Proceedings of the 4th International Conference on Site Characterization 4, ISC-4 | Year: 2013

This paper present the results from the first series of tests performed with a cyclic friction sleeve mounted on a static cone penetrometer. This cyclic friction sleeve was developed to answer a present demand to assess the evolution of lateral skin friction of piles under cyclic loading. The CPT is a test more and more widely used to assess with great accuracy the stratigraphy of ground masses, identify and characterize soil layers and give access to some mechanical properties. This device has been designed to be placed at a certain distance above a piezocone cone in order to avoid the influence of the strong evolution of pore pressure at the level and behind the cone. In this first version the sinusoidal cycles are applied by nitrogen using the control unit developed for the LCPC self boring pressuremeter.

Auberlet J.-M.,University Paris Est Creteil | Rosey F.,Normandie Center | Anceaux F.,University of Valenciennes and Hainaut‑Cambresis | Aubin S.,CER ESEO | And 3 more authors.
Accident Analysis and Prevention | Year: 2012

Our study focused on the lateral position of drivers in relation to risk on rural crest vertical curves, using a field site proposed by a local operator of the French road network (Conseil Général de Maine-et-Loire, 49). The final goal was to test one road treatment on this field site. The study consisted of three stages. The first, using driving simulators, selected two perceptual treatments (i.e.; rumble strips on both sides of the centerline and sealed shoulders) from five that were tested in order to help drivers maintain lateral control when driving on crest vertical curves. The rumble strips were installed first on the field site. The second stage was to develop a diagnostic device specifically in order to evaluate, on the field site, the impact of a perceptual treatment on the driver's performance (i.e.; lateral position). This diagnostic device was installed in the field upstream and downstream of the target crest vertical curve. The third stage was to collect the data during two periods, before and after the centerline rumble strips were installed. We then compared the results obtained in the field study with those from the driving simulator studies. The comparison showed that, as in the simulator studies, the centerline rumble strips on the crest vertical curve affected lateral positions, causing the participants to drive closer to the center of the lane. Finally, the results showed the usefulness of driving simulators in the road design process. © 2011 Elsevier Ltd. All rights reserved.

Ardhuin F.,French Research Institute for Exploitation of the Sea | Devaux E.,CETE de lOuest | Pineau-Guillou L.,SHOM
Annales Hydrographiques | Year: 2011

Seiches may pose problems for the safety of navigation and can prevent proper operation of ports. Following the identification of digital and analog tide measurements of French ports on the Atlantic coast and the Channel, seiche signals were isolated. The frequency analysis was used to estimate the natural periods of each port. Analysis of possible causes of seiches indicates that for short periods, as in Port-Tudy with 4 to 5 minutes, sea state is the dominant cause of seiches through infragravity wave excitation outside the port. Significant infragravity wave height (HIG) in the south of Ile de Groix is thus a reliable indicator of seiches height (correlation 0.87) and is predictable, days in advance, through the forecast of sea state spectrum.

Villain G.,LUNAM University | Du Plooy R.,LUNAM University | Ihamouten A.,CETE de lOuest | Palma-Lopes S.,LUNAM University | And 2 more authors.
IWAGPR 2013 - Proceedings of the 2013 7th International Workshop on Advanced Ground Penetrating Radar | Year: 2013

This paper deals with the use of electromagnetic nondestructive in-situ techniques to assess concrete condition. It shows the potential of these methods to monitor the ingress of water and chlorides into cover concrete. The electromagnetic properties that are studied here are electrical resistivity and dielectric permittivity, both sensitive to volumetric water content and chloride content. Results from an experimental study conducted on concrete slabs (and corresponding core cylinders) in a controlled laboratory environment are presented. Then, the discussion is focused on the ability of three EM techniques to assess the depth of the ingress front of the different salt solutions and discern between their salt concentrations (0, 15 and 30 g/L). © 2013 IEEE.

du Plooy R.,LUNAM University | Villain G.,LUNAM University | Palma Lopes S.,LUNAM University | Ihamouten A.,CETE de l'Ouest | And 2 more authors.
Materials and Structures/Materiaux et Constructions | Year: 2013

One of the principal causes of deterioration in reinforced concrete structures is steel corrosion caused by the penetration of aggressive agents into the protective cover concrete layer (particularly water containing chlorides). Electromagnetic non-destructive evaluation (EM NDE) techniques are sensitive to these aggressive agents and can be used to assess concrete durability in terms of corrosion risk. The electromagnetic (EM) properties that are the focus of the study presented here are electrical resistivity and dielectric permittivity—inherent material properties that are both sensitive to degree of saturation and the salinity of the pore solution. Three EM NDE techniques suitable for the in situ investigation of concrete are used to obtain these EM properties: electrical resistivity tomography, capacimetry and ground penetrating radar. Experimental work is conducted on in a controlled laboratory environment with the aim of comparing the ability of the three EM NDE techniques to monitor the ingress of saline solutions into concrete slabs and discern between their chloride content. All three methods are found to be capable of detecting variation in water and chloride content and therefore show promise for the in situ monitoring of water and chloride ingress. However, more research is needed on the quantification of the EM properties over depth as well as on the combination of these methods in order to separate the influence of these two parameters on the EM responses. © 2013, RILEM.

Berger J.,CETE de lOuest | Berger J.,CNRS Laboratory of Design Optimisation and Environmental Engineering | Tasca-Guernouti S.,CETE de lOuest | Woloszyn M.,CNRS Laboratory of Design Optimisation and Environmental Engineering | Buhe C.,CNRS Laboratory of Design Optimisation and Environmental Engineering
Proceedings of BS 2013: 13th Conference of the International Building Performance Simulation Association | Year: 2013

An excessive level of moisture in building damages their quality. Key factors associated to the development of this damages mainly depend on the hygrothermal fields inside building envelope. These key factors can be associated with HAM models to predict the development of moisture damages. Different granularities of HAM modelling exist in literature and can be used. In this paper, main advantages and drawback of most common approaches are presented and discussed. A test case is chosen to illustrate the different issues. Copyright © 2011 by IPAC'11/EPS-AG.

Berger J.,CETE de lOuest | Berger J.,CNRS Laboratory of Design Optimisation and Environmental Engineering | Rouchier S.,Lyon Center of Thermal Science | Tasca-Guernouti S.,CETE de lOuest | And 2 more authors.
Proceedings of BS 2013: 13th Conference of the International Building Performance Simulation Association | Year: 2013

This paper focuses on the issue of integrating two or three dimensional models of heat and moisture transfer in porous materials with whole building HAM modeling. To assess this aim, this paper proposes a reduced order model to simulate 2D Heat, air and moisture (HAM) behaviour in porous material. The reduction method used is the proper orthogonal decomposition. The method is applied on a block of concrete. Reduced order model and large original model are compared. The results illustrate the significant value of model reduction for modelling 2D heat and mass transfers. Copyright © 2011 by IPAC'11/EPS-AG.

Gavaud O.,Cete de lOuest | Brehier O.,Cete de lOuest | Guilbault M.,University of Marne-la-Vallée | Nierat P.,University of Marne-la-Vallée
Recherche Transports Securite | Year: 2011

Road haulage is nowadays the main transport mode in France, demonstrating its ability to fulfil shippers' demands. Among other success factors, the possibility for large companies to subcontract to very small ones, with very low fixed costs and greater flexibility, is often quoted as a major advantage. The ECHO survey, conducted in France in 2004, gives information about 10000 shipments made by 3000 shippers. This survey allows the analysis of subcontracting, by following at every stage how each shipment is given to another carrier by contract. The analysis shows that some subcontracts are mainly cost driven, but others aim at using the specialised skills of a particular haulier. For every transport segment (single parcel delivery service, parcel delivery service, less than truck load, full truck load), subcontracting is described in terms of sizes of the companies involved, services provided and the reasons for subcontracting. These results describe the main features of several different types of subcontracts. © 2011 INRETS et Springer-Verlag France.

Berger J.,CETE de lOuest | Berger J.,CNRS Laboratory of Design Optimisation and Environmental Engineering | Guernouti S.,CETE de lOuest | Woloszyn M.,CNRS Laboratory of Design Optimisation and Environmental Engineering | Buhe C.,CNRS Laboratory of Design Optimisation and Environmental Engineering
Journal of Building Engineering | Year: 2015

Excessive levels of moisture in buildings lead to building pathologies. Moisture also has an impact on the indoor air quality and the hygrothermal comfort of the building's occupants. A comprehensive list of the possible types of damage caused by moisture in buildings is discussed in the present paper. Damage is classified into four types: damage due to the direct action of moisture, damage activated by moisture, damage that occurred in a moist environment and deterioration of the indoor environment. Since moisture pathologies strongly depend on the hygrothermal fields in buildings, integrating these factors into a global model combining heat air and mass transfers and building energy simulation is important. Therefore, the list of moisture damage types is completed with a proposal of factors governing the risk of occurrence of each type of damage. The methodology is experimented on a simple test case combining hygrothermal simulations with the assessment of possible moisture disorders. © 2015 Elsevier GmbH. All rights reserved.

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