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Nantes, France

Auberlet J.-M.,University Paris Est Creteil | Rosey F.,Normandie Center | Anceaux F.,University of Valenciennes and HainautCambresis | 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. Source

Gavaud O.,Cete de lOuest | Brehier O.,Cete de lOuest | Guilbault M.,University of Marne-la-Vallee | Nierat P.,University of Marne-la-Vallee
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. Source

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. Source

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. Source

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. Source

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